I've built this simple bridge amp based on the old TDA2003.This amp puts out great sound with low distortion
I've used the schematic found in this site.
I've used the schematic found in this site.
R2/R5 are 5.6ohms. It could be from 2 to 10ohms.
R3/R6 are 470 ohms or R3=R2×100
Cf is 470 picofarads or higher value if you get noise.
It is better to use spring clips for your speaker cables...
instead of these
Problems you may face after building the circuit
crackling noise
When I turned on the amp everything was ok at first but after a while when it heated up a very annoying
crackling noise appeared even at zero volume.
It is better to use spring clips for your speaker cables...
 |
| The spring clips eliminated some or the crackling! |
instead of these
Problems you may face after building the circuit
crackling noise
When I turned on the amp everything was ok at first but after a while when it heated up a very annoying
crackling noise appeared even at zero volume.
The hiss was there even with the audio cable disconnected.This sounded like a heat problem.
When it heated up some bad tracks where expanding due to heat causing the crackling.So,I resoldered all tracks and joints and the problem was solved.
loud noises when not audio in cable not connected
That's an easy one.Connect 1.5Kohm resistor or more from audio in (Vin) to ground.See the resistor in the image below?
other things you can do for sound problems
Additionaly you can add ferrite beads to the AC and DC input and the speaker cables as well.A more complex solution would be to use a simple high-pass filter circuit between the audio source and the amp.
Some noises can be eliminated by simply adding a 102 cap between audio Vin and ground.
If you get a buzz from the speakers then it is probably interference from another device.Turn off all other devices and disconnect every external device you can from your computer.
loud noises when not audio in cable not connected
That's an easy one.Connect 1.5Kohm resistor or more from audio in (Vin) to ground.See the resistor in the image below?
other things you can do for sound problems
Additionaly you can add ferrite beads to the AC and DC input and the speaker cables as well.A more complex solution would be to use a simple high-pass filter circuit between the audio source and the amp.
Some noises can be eliminated by simply adding a 102 cap between audio Vin and ground.
If you get a buzz from the speakers then it is probably interference from another device.Turn off all other devices and disconnect every external device you can from your computer.
I had an external monitor plugged in to the vga-in on the side of my laptop.I found by mistake that this was a major source for the buzz I got on my speaker. The power cable to the laptop gives out noise also.
Here is the live amp used with an 80Watt speaker! Each of three drivers is 8ohms.
read also
lm386 half a watt mini amp
TDA7360 bridge amp (up to 22 watts)
arximastoras.blogspot.com
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