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nuckolls.bob(at)aeroelect
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 Posted: Wed Jun 15, 2011 6:49 pm Post subject: AEC 9009 Audio Amplifier Troubleshooting Questions |
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At 07:39 PM 6/15/2011, you wrote:
| Quote: | I just got to the point where I can test my home-made audio
amplifier, but it isn't working yet, and I was hoping I might be
able to get some help from those who have built the circuit before
to help narrow down the troubleshooting. I wired it up, applied
power, and it blew the 1A fuse. I looked everything over to be sure
that I didn't have any obvious shorts and couldn't find any. Just
to be sure that the rest of the wiring wasn't the problem, I removed
all of the wires except for the power and ground, but it still blows
the fuse. I went through each component and verified the placement
of the ICs and resistors. I did notice that I had one capacitor
backwards, number 127, 1uF capacitor. I reversed it but still
didn't notice any difference. Is there an easy way to test a
capacitor to see if it is still good? There isn't any physical
damage to any of them.
|
Hmmm . . . I wish I had called out sockets under the
amplifiers so that the builder can power it up with the
ic's out.
Capacitor size is not terribly critical but polarity
is. MOST of the times you get a hot LM317 is for
a reversed capacitor C122.
Do an ohmmeter test from pin 6 to ground on either
of the two amplifier chips. It should be non-zero.
Actual measurement depends on your ohmmeter and
polarity of the ohmmeter connections. The main
thing is that it should be some substantial number
showing that the path is not shorted.
| Quote: | I replaced the fuse with my multimeter leads to try and measure how
much current it was taking, but the meter read zero, so I turned off
the switch after a second or so. After that test the 317 was warm,
but not hot, and nothing seemed to be smoking.
|
When powered up, you should have just under 9v
on pin 6 of the two amplifiers. I don't know how
you heat up the LM317 with zero current. Check
the measurement setup.
Bob . . .
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email(at)jaredyates.com
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| Posted: Thu Jun 16, 2011 6:58 am Post subject: AEC 9009 Audio Amplifier Troubleshooting Questions |
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Indeed, I had installed the 122 backwards. It works now, thanks!
On Jun 15, 2011, at 22:45, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> wrote:
| Quote: |
At 07:39 PM 6/15/2011, you wrote:
> I just got to the point where I can test my home-made audio amplifier, but it isn't working yet, and I was hoping I might be able to get some help from those who have built the circuit before to help narrow down the troubleshooting. I wired it up, applied power, and it blew the 1A fuse. I looked everything over to be sure that I didn't have any obvious shorts and couldn't find any. Just to be sure that the rest of the wiring wasn't the problem, I removed all of the wires except for the power and ground, but it still blows the fuse. I went through each component and verified the placement of the ICs and resistors. I did notice that I had one capacitor backwards, number 127, 1uF capacitor. I reversed it but still didn't notice any difference. Is there an easy way to test a capacitor to see if it is still good? There isn't any physical damage to any of them.
Hmmm . . . I wish I had called out sockets under the
amplifiers so that the builder can power it up with the
ic's out.
Capacitor size is not terribly critical but polarity
is. MOST of the times you get a hot LM317 is for
a reversed capacitor C122.
Do an ohmmeter test from pin 6 to ground on either
of the two amplifier chips. It should be non-zero.
Actual measurement depends on your ohmmeter and
polarity of the ohmmeter connections. The main
thing is that it should be some substantial number
showing that the path is not shorted.
> I replaced the fuse with my multimeter leads to try and measure how much current it was taking, but the meter read zero, so I turned off the switch after a second or so. After that test the 317 was warm, but not hot, and nothing seemed to be smoking.
When powered up, you should have just under 9v
on pin 6 of the two amplifiers. I don't know how
you heat up the LM317 with zero current. Check
the measurement setup.
Bob . . .
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