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Return to ProjectsLow Cost 2x20 Watt Stereo Amplifier by TDA2005
Posted Jan 10, 2012 at 10:57 am
Project Summary
This circuit is a small stereo amplifier for all suitable applications like amplifying small speakers, boxing, etc. It is also suitable for car use but before, the power supply must be choked with at least 150mH and it must give up to approximately 6 to 7 amps during the upstream performance.
Project Description
Figure 1
Technical data:
Performance of TDA2005M: (for this circuit); At 14.4 V supply voltage: 2 × 20 watts (stereo) into 4 Ohms.
Distortion: Approx. 0.2% at 4 Watts into 4 ohm load.
Frequency Range: Approx. 20 Hz to 22 KHz.
Input Sensitivity: Approx. maximum 150 mV rms. .
Power supply: + 8 to 18 volts, approx. maximum 3.5 Amps per channel.
Appropriate heatsink for the amplifier is SK08 with a height of 50 mm (approx. 2.5 K per watt). You should drill the cooler after soldering the board to center it properly. The TDA2005 also needs not be isolated from the heat sink, since the metal mounting part of the IC is grounded. You should use thermal paste to improve the heat dissipation. After the assembly , case construction is left to the builder. 100K potentiometers are used for adjusting the input volume. The potentiometers are absent in the layout. The 100K resistors need only be installed if the 100 K potentiometers are not used as shown in the layout.
You should use a well designed quality transformer to get less noise. It will be another good way to use a sufficient battery to power the circuit. Keep the supply wires as short as possible. Input source should be isolated from the external noises too. It is recommended to use coaxial cable to connect the input audio.
Project Files
| File Name | File Size |
|---|---|
| Schematic, PCB and Layout files | 524.61 KB |
Comments on this Project:
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4 years ago: thank you my frend
2 years ago: I like it when it comes in very handy without the use of external power supply or adapter...
2 years ago: the circuit its ok??... because in my pcb of this desing the output power is very low.. the power supply is 16v aprox... thank
2 years ago: wow! this is very handy! i will make a good enclosure box for this for proper protection!
2 years ago: thank you
2 years ago: this was one of the first things I built back in the 90's,,,I desoldered the part from a older car POWER BOOSTER/EQ To be honest it actually rocked far beyond my expectations as a guitar amplifier!
2 years ago: muchas gracias, muy buenos circuitos ok
saludos desde Latinoameria
2 years ago: Can I power this circuit from ATX (power supply for personal computer)??? Thanks!
2 years ago: I built this circuit and it works OK. I replace original condenser 270nF with 330nF.
2 years ago: It's possible to power this circuit with PC supply, between black and white wire. And for turn supply on, you have to short-connect black and green wire.
If we look at some others schematic and their prices, this is very good amplifier for little price.
Author, thank you!
2 years ago: your circuit is very nice and simple.thanks for your pcb layout and components layout. i tried and built this amplifier with different layout.this amp sounds good ang powerful,its a BTL amp..
1 year ago: HEIGHT: 70mm
WIDHT: 85mm
DEPHT: 35mm
I have this heatsink, is it OK for this amplifier for about 2 hours on middle power?
Thanks!
1 year ago: I built amplifier, and it works OK! DC offset on one canal is 10mV, and on another is 75mV. :)
1 year ago: That PCB looks so wonderful congratulations to the chef!!!
1 year ago: A perfect TDA 2005 20 W Amp. Congratulations to all of You.
1 year ago: what would be a good power supply for this? It says 3.5 amps per channel, so 7 in total. But psu with this power are very expensive.
11 months ago: Would it be ok if i use a 50k pot instead of a 100k?
11 months ago: hello, with a 12v transformer and 3A it works?