22 Watt Audio Amplifier

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The 22 watt amp is easy to build, and very inexpensive. The circuit can be used as a booster in a car audio system, an amp for satellite speakers in a surround sound or home theater system, or as an amp for computer speakers. The circuit is quite compact and uses only about 60 watts. The circuit is not mine, it came from Popular Electronics.

Schematic

Parts

Part	Total Qty.	Description	Substitutions
R1	1	39K 1/4 Watt Resistor
C1,C2	2	10uf 25V Electrolytic Capacitor
C3	1	100uf 25V Electrolytic Capacitor
C4	1	47uf 25V Electrolytic Capacitor
C5	1	0.1uf 25V Ceramic Capacitor
C6	1	2200uf 25V Electrolytic Capacitor
U1	1	TDA1554 Two Channel Audio Amp Chip
MISC	1	Heatsink For U1, Binding Posts (For Output), RCA Jacks (For Input), Wire, Board

Notes

The circuit works best with 4 ohm speakers, but 8 ohm units will do.

The circuit dissipates roughly 28 watts of heat, so a good heatsink is necessary. The chip should run cool enough to touch with the proper heatsink installed.

The circuit operates at 12 Volts at about 5 Amps at full volume. Lower volumes use less current, and therefore produce less heat.

Printed circuit board is preferred, but universal solder or perf board will do. Keep lead length short.

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Comments

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bor 22 Watt Audio Amplifier Tuesday, February 12, 2013 1:22:39 AM

this is our project in our school. it's so nice and sounds good too. It is better when you put tone control on it with bass, treble, balance, and master volume...nice!!!!

anonymous 22 Watt Audio Amplifier Thursday, December 13, 2012 10:54:37 AM

how to attache bass, treble and volume controls with the circuit and also the audio cable?

raad 22 Watt Audio Amplifier Sunday, June 03, 2012 2:08:51 AM

Is there any substitution for TDA 1554 chip?? Its not available in my area.. :( plz suggest..

anonymous 22 Watt Audio Amplifier Monday, December 26, 2011 2:42:09 AM

how can i connect a volume control in this circuit..????

anonymous 22 Watt Audio Amplifier Friday, April 29, 2011 5:16:52 AM

Just to say to all: This is 22 watts PER CHANNEL

alex 22 Watt Audio Amplifier Saturday, April 09, 2011 9:52:24 PM

reply to: sameguy. Hi there. you need a preamplifier to use a mic. with the amp.

NUR MUHAMMED 22 Watt Audio Amplifier Tuesday, February 01, 2011 1:12:45 PM

Thank you so much for the circuit diagram.I built the amp it work perfectly. I added LED (as power light), FAN (to cool the IC), DIODE on the positive power line which served as a protection in case polarity is mixed, 100k variable resistor for volume control and i also added Bass and Treble controller.For the power supply i use a PC power supply.All worked very well, so clear sound.I am very happy.Thank you .

Bruce 22 Watt Audio Amplifier Monday, January 31, 2011 2:31:19 PM

This Amplifier is soo amazing and sounds soo clean..I Love it. The wires I used with the circuitboard were taken from an old telephone wire (excelent conducter). The Heatsink was held tight in place to the IC along with heat transfer paste. An old headphone jack with the wire was used for the left-in & right-in connection. Four 8 ohm speakers were used for the left-out & right-out connections(two for left & two for right) Only thing I need now is to make an attractive case for it and use it with my computer exclusively. My next project will be to build the "12VDC to 120VAC Inverter" which I will use with my Solar Panel Batteries...

Mic 22 Watt Audio Amplifier Sunday, December 19, 2010 2:15:09 AM

Hi everyone. Instead of using a speaker as output, I want use headphone. Is this possible? I want to solder directly from this diagram of headphone jack http://techpubs.sgi.com/library/dynaweb_docs/hdwr/SGI_EndUser/books/Octane_OG/sgi_html/figures/speaker.headph.port.gif to the amplifier output. Please help me. I want to use my extra headphone. I still don't have money to buy speaker.

nicholas 22 Watt Audio Amplifier Thursday, October 07, 2010 7:30:57 AM

please i broke the signal ground. will it work?

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bor	22 Watt Audio Amplifier	Tuesday, February 12, 2013 1:22:39 AM
this is our project in our school. it's so nice and sounds good too. It is better when you put tone control on it with bass, treble, balance, and master volume...nice!!!!
anonymous	22 Watt Audio Amplifier	Thursday, December 13, 2012 10:54:37 AM
how to attache bass, treble and volume controls with the circuit and also the audio cable?
raad	22 Watt Audio Amplifier	Sunday, June 03, 2012 2:08:51 AM
Is there any substitution for TDA 1554 chip?? Its not available in my area.. :( plz suggest..
anonymous	22 Watt Audio Amplifier	Monday, December 26, 2011 2:42:09 AM
how can i connect a volume control in this circuit..????
anonymous	22 Watt Audio Amplifier	Friday, April 29, 2011 5:16:52 AM
Just to say to all: This is 22 watts PER CHANNEL
alex	22 Watt Audio Amplifier	Saturday, April 09, 2011 9:52:24 PM
reply to: sameguy. Hi there. you need a preamplifier to use a mic. with the amp.
NUR MUHAMMED	22 Watt Audio Amplifier	Tuesday, February 01, 2011 1:12:45 PM
Thank you so much for the circuit diagram.I built the amp it work perfectly. I added LED (as power light), FAN (to cool the IC), DIODE on the positive power line which served as a protection in case polarity is mixed, 100k variable resistor for volume control and i also added Bass and Treble controller.For the power supply i use a PC power supply.All worked very well, so clear sound.I am very happy.Thank you .
Bruce	22 Watt Audio Amplifier	Monday, January 31, 2011 2:31:19 PM
This Amplifier is soo amazing and sounds soo clean..I Love it. The wires I used with the circuitboard were taken from an old telephone wire (excelent conducter). The Heatsink was held tight in place to the IC along with heat transfer paste. An old headphone jack with the wire was used for the left-in & right-in connection. Four 8 ohm speakers were used for the left-out & right-out connections(two for left & two for right) Only thing I need now is to make an attractive case for it and use it with my computer exclusively. My next project will be to build the "12VDC to 120VAC Inverter" which I will use with my Solar Panel Batteries...
Mic	22 Watt Audio Amplifier	Sunday, December 19, 2010 2:15:09 AM
Hi everyone. Instead of using a speaker as output, I want use headphone. Is this possible? I want to solder directly from this diagram of headphone jack http://techpubs.sgi.com/library/dynaweb_docs/hdwr/SGI_EndUser/books/Octane_OG/sgi_html/figures/speaker.headph.port.gif to the amplifier output. Please help me. I want to use my extra headphone. I still don't have money to buy speaker.
nicholas	22 Watt Audio Amplifier	Thursday, October 07, 2010 7:30:57 AM
please i broke the signal ground. will it work?