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Old 20th January 2014, 04:25 PM   #1
aprules2 is offline aprules2
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Default want to build an Amp

Hi, I'm new to the forum. I have an old Craig Powerplay Road rated received in my Mustang. The internal amp went bad, and I can't find anyone to fix it. I was thinking maybe I could just build a 12 volt amp and connect it to the tuner and 8 Track. The newer amp would probably sound better and I could keep the cool vintage look. is something like that feisable? From what I gather the wire on one side of the volume control is the out put from the tuner and or 8 Track and then the other side goes to the amp. could I take that lead and use it as my input? What do you guys think. ID like 18 watts per channel and like 4 channels.
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Old 20th January 2014, 05:40 PM   #2
tvrgeek is offline tvrgeek  United States
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A DIY car amp will cost many times what a car amp would cost you. Mass production you know.

It is quite feasible to pull an output from your old head unit. Might need to buffer it.
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Old 21st January 2014, 08:51 PM   #3
aprules2 is offline aprules2
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I didnt mean an amplifier to amplify a working stereo I meant one to replace the non working one built into the radio. So really I cant buy one.

How would I rebuffer everything. I have a 400 watt after market amp I could use. But due to the dead internal amp, I have no output from the stereo to send to it.
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Old 21st January 2014, 09:53 PM   #4
amptech is offline amptech  Scotland
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Welcome to the forum..the simple amp circuits are tda2050 amp's these work off 12v to 30 volts..

if your internal amplifier is not working,,oh by the way, it's not a good idea to send signal from the speaker out put end to a next amp input or your roast that amps input circuit..

signals are fed from the line outs only as this volts is 750mv to 1.5v ac only not large volts from above 10volts...

it may be cheaper to buy one, but if your looking to gain more insight to diy amps try on line for circuits...car amplifier's have dc to dc converters that splits dc rails also there's protection systems based around the psu and o/p amp stage..

good luck..
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Old 22nd January 2014, 12:20 AM   #5
jerluwoo is offline jerluwoo  United States
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Location: Ashland,Ky U.S
Have you had a look inside yet? These units used discrete components instead of IC's for the amps. If both channels are not working it may be something other than the amps themselves, such as, a filter component in power supply like an old capacitor or diode that is common to both channels. Do a little investigating and someone may be able to help get it going again. Don't forget pictures they help.
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Old 22nd January 2014, 01:00 AM   #6
aprules2 is offline aprules2
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Join Date: Jan 2014
Heres what I can tell you, when I got it I didn't have a wiring schematic so I sat down with it hooked to the car and figured it out. But it had no sound no matter what I did. Then I took the speaker ground from the radio and hooked it to the chassis ground of the car then hooked a speaker to the speaker lead and another end to the chassis ground and I had sound, but there was a loud whine on the left channel. While I was checking stuff out I accidentally touched the left channel to ground and now there's no sound at all. Ill try and pull it out open it up and get some pics online.
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Old 22nd January 2014, 03:57 AM   #7
Absconditus is offline Absconditus  Australia
Join Date: Jun 2013
Location: Melbourne
This should be in Car Audio.
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