Thread View: sci.electronics.repair
3 messages
3 total messages
Started by Matt Flax
Thu, 24 Nov 2005 23:53
Generic Car Amp. schematic
Author: Matt Flax
Date: Thu, 24 Nov 2005 23:53
Date: Thu, 24 Nov 2005 23:53
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Hello, I would like to begin to repair a few car amps. I have around the place at mine .... They all seem to have massive power filters and two major types of active components ... Can anyone point to a good place to see a generic car audio schematic ? I have tried to find the schematics for these particular amplifiers, but alas no luck so far ... thanks Matt
Re: Generic Car Amp. schematic
Author: James Sweet
Date: Fri, 25 Nov 2005 01:18
Date: Fri, 25 Nov 2005 01:18
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Matt Flax wrote: > Hello, > > I would like to begin to repair a few car amps. I have around the place > at mine .... > > They all seem to have massive power filters and two major types of > active components ... > > Can anyone point to a good place to see a generic car audio schematic ? > I have tried to find the schematics for these particular amplifiers, but > alas no luck so far ... > > thanks > Matt There's been several construction projects in various magazines. Essentially they're very similar to a household amplifier, except rather than a 60 (or 50) Hz transformer stepping down the line voltage, car amps use a high frequency switchmode power supply to step up the 12V to the + and - voltages required by the amplifier. First determine whether the problem is in the power supply or the amplifier section, then Standard diagnostic procedures apply to either portion. Usually the problem is not too hard to track down, most all these amps are very similar at a basic level.
Re: Generic Car Amp. schematic
Author: Ken Taylor
Date: Fri, 25 Nov 2005 01:30
Date: Fri, 25 Nov 2005 01:30
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"James Sweet" <jamessweet@hotmail.com> wrote in message news:zDthf.6821$Dx3.3359@trnddc07... > Matt Flax wrote: >> Hello, >> >> I would like to begin to repair a few car amps. I have around the place >> at mine .... >> >> They all seem to have massive power filters and two major types of active >> components ... >> >> Can anyone point to a good place to see a generic car audio schematic ? >> I have tried to find the schematics for these particular amplifiers, but >> alas no luck so far ... >> >> thanks >> Matt > > > There's been several construction projects in various magazines. > Essentially they're very similar to a household amplifier, except rather > than a 60 (or 50) Hz transformer stepping down the line voltage, car amps > use a high frequency switchmode power supply to step up the 12V to the + > and - voltages required by the amplifier. First determine whether the > problem is in the power supply or the amplifier section, then Standard > diagnostic procedures apply to either portion. Usually the problem is not > too hard to track down, most all these amps are very similar at a basic > level. Many (most?) have a single brick PA module per channel, which in my no-longer-recent experience has been source of the problem much of the time. A quick check of the web for data on the brick concerned will reveal a recommended/sample circuit, which often as not is followed close enough to make fault finding easier. Cheers. Ken
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