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Old 4th January 2012, 05:46 PM   #1
m4ick is offline m4ick  United States
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This amp had 40ohms across + and - power terminals. I bank of power supply fets was close to 0 ohms.

With no power supply fets and no power supply drivers installed I get no output from the 494.

Here is what I get DCV referenced to - power terminal:
01: 0v
02: 4.89v
03: 4.74v
04: Starts at about 5v and quickly drops to 0v
05: 1.41v - has sawtooth.
06: 3.54v
07: 0v
08: 14v
09: 0v
10: 0v
11: 14v
12: 14v
13: 4.88v
14: 4.88v
15: 4.88v
16: 5.02v

Pin 3 is being driven high even though pin 1 is lower than pin 2. Could this be a bad 494?
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Old 4th January 2012, 05:51 PM   #2
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Why is 16 high, something is setting it to 5V?
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Old 4th January 2012, 06:02 PM   #3
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Try reducing the 12v supply voltage to about 13v.
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Old 4th January 2012, 06:22 PM   #4
m4ick is offline m4ick  United States
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Can't manually adjust my power supply so I put some 270ohm resistors in parallel and I get signal. Is this thing just that heavily regulated? Why does that cause the drive signal to appear?

Should I expect that when I install PS fets and drivers that it will still be there?

EDIT: That is, the resistors are in parallel with each other, inline with B+. It's all I can do to limit the voltage.
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Last edited by m4ick; 4th January 2012 at 06:24 PM.
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Old 4th January 2012, 06:27 PM   #5
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What is the voltage across the B+ and ground terminals of the amp with and without the resistors in series?

What make/model 12v power supply do you have?
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Old 4th January 2012, 06:33 PM   #6
m4ick is offline m4ick  United States
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Wow, this thing is putting out close to 16v with nothing connected. Seems high.

Is this amp sensitive to over voltage?

Maybe it's time to break out an old computer PSU.
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Last edited by m4ick; 4th January 2012 at 06:43 PM.
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Old 4th January 2012, 06:46 PM   #7
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It may be adjustable internally.

Some amps have over-voltage protection. This one likely does and 16v was just a bit too high.
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Old 4th January 2012, 06:59 PM   #8
m4ick is offline m4ick  United States
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Ok, I hooked the amp to a computer power supply and I get 12.03V across B+ and -. I'm still in protect. With resistors in the B+ line it reduces to just over 5v and powers on.
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Old 4th January 2012, 07:02 PM   #9
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What's the DC voltage on pins 15 and 16 at 12v in?
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Old 4th January 2012, 07:09 PM   #10
m4ick is offline m4ick  United States
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This is what I get now:
01: 0v
02: 5v
03: 0.07v
04: 2.69v
05: 0v
06: 3.74v
07: 0v
08: 12v
09: .03v
10: .05v
11: 12v
12: 12v
13: 5v
14: 5v
15: 5v
16: 3.86v
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