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Original filename: TDA Modular amp.pdf

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Modular expandable
power amplifier with
TDA7293 / TDA7294

Conn4

U1

Conn5

R6
R7
C6

C5
C2

R1
C3
C8

C9

C1

R2

Schematics and BOM for
modular TDA7293 amplifier

3 -

Modular poweramp with TDA7293 and TDA7294

Schematics and Bill of materials for TDA amplifier
Schematic and BOM of first (main) module
1

2

3

4

5

6

R11 56k

2
3

10u

In 2
GND

3

22k

1
11

In 1

2

GND

1

GND

2 input connector

Schematic and BOM of first (main) module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Schematic and BOM of second (bridge) module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Schematic and BOM of third (parallel) module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Schematic and BOM of speaker protection module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Three modes of TDA7293 from the official datasheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Simplified schematic of bridged and paralleled modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Connections between single, bridge and parallel modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Variations between main, bridge, and parallel modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

T1

1

PCB for modular expandable TDA amplifier project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

BC212

14
15
16
17

Examples how to connect modules and build instrument amplifiers . . . . . . . . . . . . . . . . . . . 18
Mono bridge, single and parallel, — stereo bridge and single amp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Stereo bridge + parallel, — mono bridge + doubled parallel amp with speaker protection . . . . . . . . . . . . . . . . . . . . 20

More power with parallel modules up to 800W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
23
25
26
27
28

13

Buff. Drv.

220 R10

Clip Det.
Bootstrap
Bootst. Loader

Title

2

TDA7293
1000u 60V

15x1 pin connector

10k
220
22k
30k
56k
6.8k
680
82k
TDA7293
BC212

C4

10u

10u

B

R7

5

GND

22k

C6

6

GND

22u

12

Conn6

Out +

14

B.L. B.S.
C7

1

Out -

2
3

22u

GND

C

Revision

D

1/22/2012
D:\!Works\..\TDA7293.SchDoc
5

Sheet of
Drawn By:
6

Notes
16:20:00

3 input connector

C3

4

Number

4

12/12/2011
22u
10u
220n
1N4148
1000u 60V
10u
22u

Mute

TDA 7293/7294 Stage 1 (main module)

Date:
File:

3

2 input connector

STBY

9
10

A4

Bill of Materials
Connector
Cap
Cap
NonPolarized Cap
Diode
Cap
Cap
Cap
Header 15 pin
Connector
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
TDA7293
PNP Transistor

Out

C8

Size

Value

22k

GND

http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/

Footprint
2 pin connector 100mil
CAP, 2 and 3 MIL
Cap, Tantal, 1mil
CAP, WIMA, 2MIL
Diode
Elco 12 mm, 2 mil pins
Elco 6mm, 1 mil pins
Elco 6mm, 1 mil pins
Female connector FHSHR 15
Panel Connector 3 input Small
Resistor 300mil
Resistor 300mil
Resistor 300mil
Resistor 300mil
Resistor 300mil
Resistor 300mil
Resistor 300mil
Resistor 300mil
TDA7293
TO92

R4

10k

C9

D

Comment

R3

30k

220n

22k

TDA7293.SchDoc

Slave GND

STB-GND

82k R9

R5

1

Mute

6.8k

2

R2

GND

8

R8
Conn7

STBY

+ IN

GND

Buff. Drv.
C

- IN

1000u 60V
GND

R6

C5

Conn5

Schematics and BOM for modular TDA7293 amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

More power with 3 parallel modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Speaker protection schematic with PWM fan controller V:1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Speaker protection PCB with PWM fan controller V:1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Speaker protection schematic with PWM fan controller V:2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Speaker protection PCB with PWM fan controller V:2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

+V Sig

GND

GND

PCB of main module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PCB of bridge module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PCB of parallel module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PCB of speaker protection module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

U1

22u

+V Power

C10

A

1N4148

C2

680

-V

GND

D1

220n

3 input connector

GND

1

R1

-V Power

Out -

+V

2

-V Sig

+V
-V
Mute
STBY
Br. I/O

3

15

15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

B.L.
B.S.

C1

7

3 input connector

15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

3 input connector

English blog and PCB order: http://custompcb.blogspot.com/
Hungarian blog and PCB order: http://diyguitarpa.blogspot.com/
The Youtube Channel • Picasa gallery • Email: gitarfogas@gmail.com

B

Conn4

15x1 pin connector

This project made for very simple and popular homemade amplifier instrument amplification. The gainclone called
TDA7293 and 7294 is very good solution for guitar or microphone amplifiers. The poweramp can be connected
to bridge, parallel, and bridge+parallel mode. This project contains 3 different PCBs for this integrated MOSFET
amplifier, and one PCB for speaker protection. Very easy to build, the output power is from 75W to 300W with one
channel, but with this project possible to build stereo application. Popular guitar amplifier makers like Marshall and
Carlsbro using TDA729x ICs for combos and guitar heads.

Conn1
Conn2

15x1 pin connector

A

Quantity Pins

1
1
1
2
1
2
2
2
2
3
1
1
4
1
1
1
1
1
1
1

Designator

2

Conn7
C7
2 C5
2 C1, C9
2 D1
2 C2, C8
2 C3, C4
2 C6, C10
15 Conn2, Conn4
3 Conn1, Conn5, Conn6
2 R3
2 R10
2 R4, R5, R6, R7
2 R2
2 R11
2 R8
2 R1
2 R9
15 U1
3 T1
2

30

Conn1: Power supply, ±47V for 7293, ±40V for 7294
Conn5: Left and Right audio level inputs
Conn7: Clipping LED connector
Conn6: Simple (GND and Out+) and bridge
(Out+ and Out-) mode speaker outputs.

This is the first and the most important
Price
Total
PriceH
Total H
module#VALUE!
of this 20project.
20 Ft This module can
#VALUE!
be used#VALUE!
alone for 1x75W
or 2x75W
#VALUE!
#VALUE!
#VALUE!
#VALUE!
amplification.
The 2commercial
amplifi#VALUE!
2
Ft
#VALUE!
#VALUE!
ers says 100W for this circuit what is not
#VALUE!
#VALUE!
true. The#VALUE!
output power
is 70—75w with 4
#VALUE!
#VALUE!
10
20 Ft
Ohm speakers,
and
about
40–50w with
#VALUE!
44
132 Ft
#VALUE!
2
2 Ft
8 Ohm#VALUE!
speakers.
The
maximum power
2
2 Ft
#VALUE!
2
supply is ±50V, but8 Ft ±47V recommend#VALUE!
2
2 Ft
ed. The#VALUE!max.2 power
of circuit called
2 Ft
2
2 Ft
7294 is#VALUE!
±40V,
with
the
7293
possible to
#VALUE!
2
2 Ft
#VALUE!
2
2 Ft
use ±50V.
If you need
more power, don’t
#VALUE!
#VALUE!
increase#VALUE!the power #VALUE!
supply, use bridge
SUM: #VALUE!
#VALUE!
or parallel configuration instead. This
module useful for both 7294 and 7293.
Only one thing must be changed, the C6
and C7 capacitor. For 7294 use ONLY
C6 between output and Bootstrap pin, for
7293 use ONLY C7 between pin 6 and
pin 12. Use this rule for all other modules.

Document last modified and saved: 22 January 2012 5:42 PM

Modular poweramp with TDA7293 and TDA7294 - 4

5 -

Schematics and Bill of materials for TDA amplifier
Schematic and BOM of second (bridge) module
4

1
11

GND

Buff. Drv.

Bootstrap
Bootst. Loader

-V Sig

Cap
Cap
NonPolarized Cap
Cap
Cap
Header 15 pin
Header 15 pin
Resistor
Resistor
Resistor
TDA7293

22u

12
14

1000u 60V

B.L. B.S.

22u

C

C

Out -

56k

Title

TDA 7293/7294 Stage 2 (bridge module)

Size

Number

Revision

2

1/22/2012
Sheet of
D:\!Works\..\TDA7293-BR-MOD.SchDocDrawn By:

3

4

5

6

Notes

12/12/2011
Footprint
CAP, 2 and 3 MIL
Cap, Tantal, 1mil
CAP, WIMA, 2MIL
Elco 12 mm, 2 mil pins
Elco 6mm, 1 mil pins
Female connector FHSHR 15
Male connector PHSR-15 (T-T)
Resistor 300mil
Resistor 300mil
Resistor 300mil
TDA7293

D

A4
Date:
File:

16:12:03
Value

22u
10u
220n
1000u 60V
22u
15x1 pin connector
15x1 pin connector
22k
56k
680
TDA7293

Quantity Pins

1
1
2
2
2
1
1
2
1
1
1

15

2

C7
C5
2 C1, C9
2 C2, C8
2 C3, C6
15 Conn5
15 Conn4
2 R6, R7
2 R2
2 R1
15 U1
2

Designator

This is the bridge module
Total
PriceH
Total H
of Price
this project.
This
mod#VALUE!
#VALUE!
ule can#VALUE!
be connected#VALUE!to
#VALUE!
#VALUE!
the right#VALUE!
side of first (main)
#VALUE!
#VALUE!
#VALUE!
circuit. This
module
dupli#VALUE!
10
10 Ft
10
10
Ft
cate the#VALUE!
output power
with
#VALUE!
2
4 Ft
8 ohm #VALUE!
speakers.
4 Ohm
2
2 Ft
#VALUE!
2
2 Ft
speakers cannot be used
#VALUE!
#VALUE!
withSUM:
bridge
amplifier. #VALUE!
#VALUE!

D

13

7

U1

2

- IN

3

15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

A

Out +/-

GND
STBY
Mute
Slave GND

Buff. Drv.

GND

10
4
B

Clip Det.
Bootstrap
Bootst. Loader
Out

5
6

B.L.

12

C7

22u

14

TDA7293
C8

C

1000u 60V
C9

R6

220n

56k

GND
Title

GND
http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/

1

2

TDA 7293/7294 Stage 3 (paralel module)

Size

Number

Revision

Date:
File:

1/22/2012
Sheet of
D:\!Works\..\TDA7293-PAR-MOD.SchDoc
Drawn By:

3

4

5

Bill of Materials

TDA7293-PARMOD.SchDoc

Comment

12/12/2011
Footprint
CAP, 2 and 3 MIL
CAP, WIMA, 2MIL
Elco 12 mm, 2 mil pins
Female connector FHSHR 15
Male connector PHSR-15 (T-T)
Resistor 300mil
TDA7293

D

A4

This module can be connected to the first (main) module, to the second
(bridged) module, and if you need more power, can be connected to the
first parallel module on the system to increase the output current.

Cap
NonPolarized Cap
Cap
Header 15 pin
Header 15 pin
Resistor
TDA7293

9

B.S.

STB-GND

11

B.L.
B.S.

1000u 60V

+ IN

1

Conn2

GND

R2

-V

6

220n

C2

GND

C7

C8

Bill of Materials
Comment

C6

6

22k

220n

http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/

TDA7293-BRMOD.SchDoc

R7

5

TDA7293

15

8

Out

B

C9

GND

1

Clip Det.

STB-GND

GND

B.L.
B.S.

B

GND

R6

22k

4

+ IN

-V Power

10u

GND

- IN

10

B.L.
B.S.

+V Power

3

9

15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

-V Power

C5

Slave GND

C1

15

2

Mute

5

Conn1

GND

+V Power

GND

4

+V

1000u 60V

STBY

3

A

15x1 pin connector

15x1 pin connector

C

U1

7

22u

-V

13

C3

Conn5

15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

C2

+V Sig

15x1 pin connector

680

A

220n

2

+V Sig

R1

15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

1

6

-V Sig

C1

Conn4

GND

D

5

8

3

+V

A

B

2

Schematics and Bill of materials for TDA amplifier
Schematic and BOM of third (parallel) module

15x1 pin connector

1

Modular poweramp with TDA7293 and TDA7294

16:20:58
Value

22u
220n
1000u 60V
15x1 pin connector
15x1 pin connector

56k
TDA7293

Quantity Pins

1
2
2
1
1
1
1

9

2

C7
2 C1, C9
2 C2, C8
15 Conn2
15 Conn1
2 R6
15 U1

Designator

6

Notes

This is the parallel module
of this amplifier project.
This mode can be connected to the right side of
first (main) module to use
with
4 ohm
speakers,
orTotal H
Price
Total
PriceH
#VALUE!
#VALUE!
can be connected to the
#VALUE!
second#VALUE!
(bridge)
module
#VALUE!
#VALUE!
to use #VALUE!
bridged 10amp with
10 Ft
#VALUE!
10
10 Ft
4 ohm too. For parallel
#VALUE!
2
2 Ft
amplification
use only
#VALUE!
#VALUE!
TDA7293
only.
SUM: #VALUE!
#VALUE!

Document last modified and saved: 22 January 2012 5:42 PM

PIN CONNECTION (Top view)

Modular poweramp with TDA7293 and TDA7294 - 6

VERY HIGH OPERATING VOLTAGE RANGE
7
-
(±50V)

DMOS POWER STAGE
HIGH OUTPUT POWER (100W @ THD =
10%, RL = 8Ω, VS = ±40V)
MUTING/STAND-BY FUNCTIONS
NO SWITCH ON/OFF NOISE
VERY LOW DISTORTION
VERY LOW NOISE
SHORT CIRCUIT PROTECTION
THERMAL SHUTDOWN
CLIP DETECTOR
MODULARITY (MORE DEVICES CAN BE
EASILY CONNECTED IN PARALLEL TO
DRIVE VERY LOW IMPEDANCES)

Schematics and Bill of materials for TDA amplifier
Schematic and BOM of speaker protection module
1

2

3

4

5

6

4

D1

9.2k

GND

R8

6.8k

C4

1N4148

4.7u

D

9

R2

10

1
2
3
4
5
6
7
8
C3

Output Power

VCLIP

1
1
3
1
1
1
2
1
1
1
1
1
1
1
1
1

19

2

Unit
V

26

40

dB

VS = ±45V; RL = 8Ω; THD = 10%

140

VS = ±30V; RL = 4Ω; THD = 10%

110

W

75

dB

W

TDA7294

Parameter

Value

Unit

Supply Voltage (No Signal)

V1

VSTAND-BY GND Voltage Referred to -VS (pin 8)

±60
90

V

V2

Input Voltage (inverting) Referred to -VS

90

V

Maximum Differential Inputs

For 7294:

V

±30

V

V3

Input Voltage (non inverting) Referred to -VS

90

V

Signal GND Voltage Referred to -VS

90

V

V5

Clip Detector Voltage Referred to -VS

120

V

V2 - V3

- High power performances with limited supply
voltage level. C8 1000µF
- Considerably
high output D97AU805A
power even with high
-Vs
load values (i.e. 16 Ohm).
The characteristics shown by figures 27 and 28,
measured with loads respectively 8 Ohm and 16
Ohm.
1/13
With Rl= 8 Ohm, Vs = ±25V the maximum output
power obtainable is 150 W, while with Rl=16
Ohm, Vs = ±35V the maximum Pout is 170 W.

C9 100nF

Bootstrap
Voltage
Referred to -VS
V6
ABSOLUTE
MAXIMUM
RATINGS
V9
Symbol
V10
V
V11S
O
VI12
Ptot
IO
Top
Ptot
Tstg, Tj
Top

T ,T
2/17stg j

Stand-by Voltage Referred to -VS
Mute Voltage Referred to -VParameter
S

Supply Voltage (No Signal)
Buffer Voltage Referred to -VS
Output Peak
Current
Bootstrap
Loader
Voltage Referred to -VS
Power Dissipation T
= 70°C
Output Peak Currentcase
Operating Ambient Temperature Range
Power Dissipation T case = 70°C
Storage and Junction Temperature
Operating Ambient Temperature Range

2/13
7

13
+

22µF

2

10

15

9

680

R5 10K

IN-

2

IN+

3

SGND

4

MUTE

10

STBY

9

R4 22K

9

15

+

22K

-

D

STBY

7

Max

Unit

1

1.5

°C/W

IN-

2

IN+

3

1

8

15

STBY-GND

-Vs

-PWVs

680
D93AU015A

OUT
BOOT
LOADER

5

C10
100nF
R7
2Ω

C5
47µF
BOOTSTRAP
CLIP DET

C8 1000µF

+Vs

BUFFER
DRIVER
7

C6 1000µF

+PWVs
13

11

-

SGND

4

MUTE

10

14

OUT

12

BOOT
LOADER

+

SLAVE

STBY

14

12

-Vs

9

13

S/C
PROTECTION

C7 100nF

22K

2

1
4

THERMAL
SHUTDOWN

C3 10µF

22µF

14

Typ

13

6

MUTE

+Vs

6

°C

+PWVs

11

+

8

TDA7294

BUFFER
DRIVER
7

-

-Vs
0.22µF

2200µF
10

C6 1000µF

C9 100nF

22K

22µF

+Vs

+Vs
R2
680Ω

VSTBY

8

1N4148

Description

R1 22K

VMUTE

TDA7294

150

W
A
°C
W
°C
°C

R3 22K

C1 470nF

22K

V
Unit
V
V
V
A
V

Parallel with 7293:

C2
22µF

14

V

120
Value
120
±50
120
10
100

50
10
0 to 70
50
150
0 to 70

Thermal Resistance Junction-case
C7 100nF

MASTER

6

120

Storage and Junction Temperature

THERMAL DATA

Figure 7: Modular Application Circuit

12/12/2011
Sheet of
D:\!Works\..\Amp-Protection.SchDoc Drawn By:
4

Designator

Conn1
C3
2 D1, D2, D3
2 C1
2 C2
2 C4
15 Conn3, Conn4
2 Conn2
3 Conn5
8 Rel1
2 R2
2 R1
2 R7
2 R8
2 R9
8 U1
2

Max.
æ 50

6

MUTE

THERMAL
SHUTDOWN

STBY

S/C
PROTECTION

1

8

15

STBY-GND

-Vs

-PWVs

C9 100nF

C8 1000µF

5

BOOTSTRAP

D97AU808D

-Vs

16:18:00
Quantity Pins

Typ.

±12

VS

C4 10µF

5

10/15

6

Figure 7: Modular Application Circuit
+Vs

C6 1000µF

R3 22K
BUFFER
DRIVER

+Vs

C2
22µF

R2
680Ω
C1 470nF

10
22k
56k
6.8k
9.2k

CLIP DET

Min.

Supply Voltage Rejection

20K

Notes

12/12/2011

STAND-BY GND

D97AU806

V4

ST-BY/MUTE
Figure 6b: PCB
- Solder Side of the fig. 6.

Revision

INVERTING INPUT

-PWVs

4

0.56µF

NON INVERTING INPUT

2

-Vs

22K

30K

SIGNAL GROUND

3

STBY-GND

TDA7293

GND

CLIP AND SHORT CIRCUIT DETECTOR

4

15

1

22n

BOOTSTRAP

5

8

Vi

UPC1237

+VS (SIGNAL)

6

1

3
0.56µF

-VS (SIGNAL)

7

Test Conditions

Symbol

BOOTSTRAP

STBY

2200µF

MASTER

2 input connector
22n
1N4148
330u
33u
4.7u
15x1 pin connector
2 input connector
3 input connector

5

+Vs

C

STAND-BY

8

ABSOLUTE MAXIMUM RATINGS
(*)

Rth j-case
0.22µF

9

Parameter

Symbol

Number

Bill of Materials

Connector
NonPolarized Cap
Diode
Cap
Cap
Cap
Header 15 pin
Connector
Connector
Relay 2
Resistor
Resistor
Resistor
Resistor
Resistor
UPC1237

BOOT
LOADER

Figure 25: Bridge Application Circuit

1
2
3
4
5
6
7
8

Dual Speker protection module

3

Value

S/C
PROTECTION

THERMAL
SHUTDOWN

MUTE

3

Date:
File:

2

Footprint
2 pin connector 100mil
CAP, Ceramic, 1MIL
Diode
Elco 12 mm, 2 mil pins
Elco 6mm, 1 mil pins
Elco 6mm, 1 mil pins
Male connector PHSR-15 (T-T)
Panel Connector 2 input Small
Panel Connector 3 input Small
Relay RE2L 24V DC
Resistor 300mil
Resistor 300mil
Resistor 300mil
Resistor 300mil
Resistor 300mil
UPC1237

12

C5
22µF

C7 100nF

Comment

OUT

Bridge with 7293 and 7294:

U1

MUTE

Supply Voltage Operating

A4

http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/

AmpProtection.SchDoc

SVR

14

+

BRIDGE APPLICATION
C3 10µF
Another application
suggestionC4is10µFthe BRIDGE
configuration, where two TDA7294 are used, as
note
see Application
shown by the schematic (*)
diagram
of figure
25.
(**) for SLAVE function
In this application, the value of the load must not
be lower than 8 Ohm for dissipation and current
capability reasons.
December1999
A suitable field of application includes HI-FI/TV
subwoofers realizations.
The main advantages offered by this solution are:

10K

Size

1

10

STBY

GND
Title

Ptot

13

11

-

6

MUTE

10

For 7293:

Gain
GLOOP
Figure 6b:
PCB - Closed
SolderLoop
Side
of the fig. 6.

22µF

GND

GND

B

1N4148

56k R7

GND

4

BOOTSTRAP LOADER

BUFFER DRIVER

1

R4 22K

330u

D3

SGND

VSTBY

C1

R9

BLOCK DIAGRAM

VS

+PWVs

(**)

D2

33u

3

R5 10K

VMUTE

8

1N4148

BUFFER DRIVER
7

2

IN+

+VS (POWER)

11

TAB connected to -VS

Symbol
TDA7293

C6 1000µF

R1 22K

Rel1

GND

2

C1 470nF

2

7

IN-

OUT

12

QUICK REFERENCE DATA
+Vs

+Vs

C2
R2
22µF 680Ω

-VS (POWER)

14

TAB CONNECTED TO PIN 8

R3 22K

1
6

C2

class TV). Thanks to the wide voltage range and
to the high out current capability it is able to supply the highest power into both 4Ω and 8Ω loads.
The built in muting function with turn on delay
simplifies the remote operation avoiding switching
on-off noises.
Parallel mode is made possible by connecting
more device through of pin11. High output power
can be delivered to very low impedance loads, so
optimizing the thermal dissipation of the system.

C7 100nF

GND

15
13

Figure 1: Typical Application and Test Circuit

5

3

15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

A

2 input connector

22k

Conn4

15x1 pin connector

2

1

GND

GND

C

2 input connector
R1

In2

Multiwatt15
ORDERING NUMBER: TDA7293V

Simple 7293 or 7294:

Conn2
1

3

Conn1

GND

15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

PIN CONNECTION (Top view)

DESCRIPTION
The TDA7293 is a monolithic integrated circuit in
Multiwatt15 package, intended for use as audio
class AB amplifier in Hi-Fi field applications
(Home Stereo, self powered loudspeakers, Top-

3 input connector

+24V

Conn3

15x1 pin connector

B

2

1

A

TDA7293

Schematics and Bill of materials for TDA amplifier
Three modes of TDA7293 from the official datasheet

Conn5

AC 24V

Modular poweramp with TDA7293 and TDA7294

MULTIPOWER BCD TECHNOLOGY

IN-

2

IN+

3

7

13/17

+PWVs
13

11

-

This is Total
very simple
and
PriceH
Total Hoptional module for all configuration
#VALUE!
20
20 Ft
of this
amplifier
project.
This module possible to use for all
#VALUE!
#VALUE!
2 mono
6 Ft and all two channels stereo configuraone #VALUE!
channel
#VALUE!
#VALUE!
tions.#VALUE!
This module#VALUE!
(if used) must be connected between
#VALUE!
#VALUE!
left and
right
channels.
Connect the left side connector of
#VALUE!
10
20 Ft
#VALUE!
20
20 Ft
speaker
protection
to
the
last
module of left channel, connect
#VALUE!
44
44 Ft
#VALUE!to the first module of the main module
right #VALUE!
side connector
#VALUE!
2
2 Ft
of right
The
#VALUE!channel.
2
2 Ft Conn5 is used for 24V DC power, and
#VALUE!
2
2 Ft
for 24V
AC
input
of UPC1237. Conn1 is the LED connector
#VALUE!
2
2 Ft
#VALUE!
2 checking.
2 Ft
for protection
Conn2 is for the high current relays,
#VALUE!
#VALUE!
connect
or
disconnect
the
speakers from speaker outputs.
SUM: #VALUE!
#VALUE!

Price

VMUTE

R5 10K

VSTBY

SGND

4

MUTE

10

STBY

9

R4 22K
C4 10µF

OUT
BOOT
LOADER

6

MUTE

THERMAL
SHUTDOWN

STBY

S/C
PROTECTION

1

8

15

STBY-GND

-Vs

-PWVs

C9 100nF
C3 10µF

5

C10
100nF

CLIP DET

Warning

C8 1000µF

+Vs

BUFFER
DRIVER

+Vs
IN-

2

IN+

3

SGND

4

MUTE

10

7

C6 1000µF

+PWVs
13

11

-

14

OUT

12

BOOT
LOADER

+

SLAVE

9

6

MUTE

THERMAL
SHUTDOWN

STBY
1

8

STBY-GND

-Vs

S/C
PROTECTION

5

BOOTSTRAP

15
-PWVs

C9 100nF

C8 1000µF
-Vs

R7
2Ω

C5
47µF
BOOTSTRAP

-Vs
C7 100nF

STBY

14

12

+

R1 22K

D97AU808C

Make sure to use the schematic from the datasheet from
2003. Slave mode is activated by pulling IN+, IN- and
SGND to -Vs, the negative supply! In older versions from
1999 of the schematic slave mode is NOT activated properly, which may lead according to reports on the internet to
the destruction of the chip.

10/13

Document last modified and saved: 22 January 2012 5:42 PM

Modular poweramp with TDA7293 and TDA7294 - 8

9 -

Modular poweramp with TDA7293 and TDA7294

Schematics and Bill of materials for TDA amplifier
Simplified schematic of bridged and paralleled modes

Bridged+paralleled
mode

Bridged mode
Paralleled mode

Document last modified and saved: 22 January 2012 5:42 PM

Modular poweramp with TDA7293 and TDA7294 - 10

11 -

Modular poweramp with TDA7293 and TDA7294

Schematics and Bill of materials for TDA amplifier
Connections between single, bridge and parallel modes
1

2

3

4

5

1

6

2

3

4

5

6

R11 56k

Buff. Drv.

8

TDA7293

Title

C8

1000u 60V

GND

C

C

Number

Date:
File:

Revision

1/22/2012
D:\!Works\..\TDA7293.SchDoc
4

D

D

6

A

B

C

13

7

+V Power

+V Sig

Mute
Slave GND

22k
GND

9
10
4

1

Clip Det.

STB-GND

Bootstrap

Buff. Drv.

GND

B.L.
B.S.

B

GND

Bootst. Loader
Out

R7

5
C6

6
14

22k

22u

12

TDA7293

B.L. B.S.
C7

C8

1000u 60V

22u

C

C9

220n
GND

R2

Out -

56k

Title

TDA 7293/7294 Stage 2 (bridge module)

Size

Number

Revision

D

A4
Date:
File:

1/22/2012
Sheet of
D:\!Works\..\TDA7293-BR-MOD.SchDocDrawn By:

1

2

3

4

5

6

1

2

3

4

5

6

1

Conn3

15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

+V

C1

AC 24V

R9

9.2k

+24V

Conn5

C1

330u

GND
D3

1N4148

3

GND

C4

3

GND

3

4

7

5

1
6

2

8

1
2
3
4
5
6
7
8
U1

1
2
3
4
5
6
7
8

5

1

D1

2

2 input connector

GND

Revision

1N4148

Conn2

GND

5

UPC1237

2 input connector

R1

R2

10

22k

Rel1

C

D

15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

U1

13

-V

2
3

1
11

Out +/-

B.L.
B.S.

- IN

GND

1000u 60V
GND
STBY
Mute

Slave GND

9
10
4
B

+ IN

B.S.
Clip Det.

STB-GND
Buff. Drv.

Bootstrap
Bootst. Loader
Out

5
6

B.L.

12

C7

22u

14

TDA7293
C8

C

1000u 60V
C9

R6

220n

56k

GND
Title

GND
http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/

6

6

1

A

220n

C2

Conn2

4

Conn1

D2

1N4148

C3

22n

GND

56k R7

R8

6.8k

2

B.L.
B.S.

GND

3 input connector

C2

33u

GND

GND

Number

4

12/12/2011
Sheet of
D:\!Works\..\Amp-Protection.SchDoc Drawn By:

Dual Speker protection module

4.7u

GND

Title

A4

Size

3

Date:
File:

2

15x1 pin connector

2

2

1

1

B

15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

+V Power

In2

GND

Conn1

-V Power

Conn4

GND

http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/

15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

A

15

D

15x1 pin connector

15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

STBY

+ IN

11

http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/

Sheet of
Drawn By:

5

GND

1000u 60V
GND

R6

GND

A4

3

15x1 pin connector

1

Input connectors for another
modules:
• Conn4 on Main module
• Conn5 on Bridge module
• Conn2 on parallel module

22u

TDA 7293/7294 Stage 1 (main module)

Size
http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/

Blue lines: connections between main
module and bridge module, one connection required between parallel module and bridged module.
Green lines: connection between main
module and parallel module, and between bridge module and parallel module.
Yellow lines: Connection between all
modules and speaker protection.
Red lines: Input for all channels, the dotted line is for second channel if the full
configuration is stereo.

3

3

10u

Conn5

GND

D

2

C7

2

220n

220 R10

22k

1

1

Out -

C5

- IN

7

BC212

B.L. B.S.

C9

R5

Notes

Out

2

GND

Conn6

Out +

14

B

GND

+V Sig

GND

B

GND

22u

12

Bootst. Loader

GND

22k

C6

6

Bootstrap

82k R9

T1

1

R7

5

Clip Det.

6.8k

2

10u

15x1 pin connector

2 input connector

Conn7

10u

U1

-V Power

Buff. Drv.

GND

C4

GND

GND

R8

C

C3

4

22u

-V

-V Sig

1

Mute
Slave GND

STB-GND

11
GND

Mute

10

+ IN

1

In 1

2

STBY

C3

8

GND

3

22k

22k

9

STBY

R6

C5

Conn5

GND

R4

10k

A

220n

C2

15

3

10u

In 2

R3

30k

680

-V Sig

- IN

R2

R1

15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

8

2

1000u 60V

C1

Conn4

15x1 pin connector

+V Sig

GND

+V

A

1N4148

13

U1

22u

+V Power

C10

A

15x1 pin connector

GND

-V

GND

D1

220n

C2

680

-V Power

Out -

1

R1

-V Sig

+V
-V
Mute
STBY
Br. I/O

+V

2

15

15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

B.L.
B.S.

3 input connector

15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

3

7

Conn4

C1

3 input connector

3 input connector

Conn2

15x1 pin connector

B

Conn1

15x1 pin connector

A

2

Size

TDA 7293/7294 Stage 3 (paralel module)
Number

Revision

D

A4
Date:
File:
3

1/22/2012
Sheet of
D:\!Works\..\TDA7293-PAR-MOD.SchDoc
Drawn
By:
Document last modified and
saved:
4

5

22 January 2012 5:42 PM
6

Modular poweramp with TDA7293 and TDA7294 - 12

13 -

Modular poweramp with TDA7293 and TDA7294

Schematics and Bill of materials for TDA amplifier
Variations between main, bridge, and parallel modules
One channel (mono) applications:

Two channel (stereo) applications:

• About 75-80W:
1. Main module only
2. Main module and speaker protection

• About 2x75-80W:
1. Main module, speaker protection, main
module

• About 150-200W on 8 Ohm:
1. Main module and Bridge module
2. Main module, Bridge module and speaker
protection

• About 2x150-200W on 8 Ohm:
1. Main module and Bridge module, speaker
protection, main module, bridge module

• About 120W on 4 Ohm:
1. Main module, parallel module
2. Main module, parallel module and speaker
protection
• About 180W on 4 Ohm:
1. Main module, and 2 parallel module
2. Main module, 2 parallel module, and
speaker protection
• About 220W on 8 Ohm:
1. Main module, 1 parallel module, bridge
module and 1 parallel module
2. Main module, 1 parallel module, bridge
module, 1 parallel module and speaker
protection
• About 300W on 4 Ohm:
1. Main module, 2 parallel module, bridge
module and 2 parallel module
2. Main module, 2 parallel module, bridge
module, 2 parallel module and speaker
protection

• About 2x120W on 4 Ohm:
1. Main module, parallel module, speaker
protection, main module, parallel module
• About 2x180W on 4 Ohm:
1. Main module, and 2 parallel module,
speaker protection, main module, 2 parallel
module
• About 2x220W on 8 Ohm:
1. Main module, 1 parallel module, bridge
module and 1 parallel module, speker
protection, main module, 1 parallel module,
bridge module and 1 parallel module

PCB for modular expandable
TDA amplifier project

• About 2x300W on 4 Ohm:
1. Main module, 2 parallel module, bridge
module and 2 parallel module, speaker
protection, main module, 2 parallel module,
bridge module and 2 parallel module

Bridge application:

Single application:

1) - 1 TDA729x IC paralleled / bridge

1) - 1 TDA729x IC paralleled

2) - 2 TDA729x IC paralleled / bridge

2) - 2 TDA729x IC paralleled

Document last modified and saved: 22 January 2012 5:42 PM

Modular poweramp with TDA7293 and TDA7294 - 14

15 -

PCB for TDA729x amplifier project
PCB of main module
TOP LAYER

Conn1

C6

Conn5

This module can be used
alone for mono - or with
speaker protection - for stereo amplifiers. This is the
first module for all possible
configurations. Conn4 can
be connected to the right
side of speaker protection
only, Conn2 is the input of
bridge, parallel or speaker
protection modules.

Conn4

BOTTOM LAYER

U1

Conn5

R6
R7
C6

C5

R1
C3

C9

C1

C2

C8
Conn6

C3

C4

C9

C8
R1
C10
C2

R8R9 T1 Conn7
1
3
C1

R6 D1 R2 R3 R4 R7 R10R5 R11

TOP LAYER

R2

OVERLAY ON TOP LAYER

U1

Conn2

Notes

C5

PCB for TDA729x amplifier project
PCB of bridge module

BOTTOM LAYER

OVERLAY ON TOP LAYER

Modular poweramp with TDA7293 and TDA7294

Notes
This is the bridge module of this project. This
module can be connected to the right side
of first (main) module
only. This module duplicate the output power with 8 ohm speakers. 4 Ohm speakers
cannot be used with
bridge amplifier if parallel modules not used.

Document last modified and saved: 22 January 2012 5:42 PM

Modular poweramp with TDA7293 and TDA7294 - 16

17 -

PCB for TDA729x amplifier project
PCB of parallel module
TOP LAYER

Modular poweramp with TDA7293 and TDA7294

PCB for TDA729x amplifier project
PCB of speaker protection module
TOP LAYER

BOTTOM LAYER

BOTTOM LAYER

Notes

U1

Conn1

C1

C2

This is the parallel module of this amplifier project. This mode can be
connected to the right
side of first (main) module to use with 4 ohm
speakers, or can be
connected to the second (bridge) module to
use bridged amp with 4
ohm speakers instead of
8. For parallel amplification use only TDA7293
only. This module can
be duplicated on single or bridged configurations after main
or bridged module
to increase the maximum output current. It’s
mean, this module can
be connected to the
previous parallel module as second parallel
output.

R7
C3
R8

R9R2

U1
C2

C1

Conn4

D3
C4

D1

Rel1

D2

R1
Conn5

Conn1

Conn2

OVERLAY ON TOP LAYER

R6

C9

Conn2

OVERLAY ON TOP LAYER

C8

Notes

This is very simple, cheap and optional module for all configuration of this amplifier project with
UPC1237. This module possible to use for all one channel mono and all two channels stereo configurations. This module (if used) must be connected between the last module of left channel and the first
(main) module of right channel. Otherworld, the left side connector (Conn3) of speaker protection
must be connected to the last module (main, bridge or parallel) of left channel, and the right side connector (Conn4) must be connected to the (first) main module of right channel.

Document last modified and saved: 22 January 2012 5:42 PM


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