I'm currently listening to my amp camp through one channel with a 98db full range speaker. It measures on average 80db at almost full volume from a meter away. Also, whenever I turn the amp on it lets out a squeal sound. What could possibly be wrong with it?
It's playing from my computer to a MiniDSP; although, I have the same issues when I use my turntable and phono...
Please, any thoughts or suggestions are appreciated.
Perhaps I need a preamp?
If I turn the volume all the way up the amp clips.
Please, any thoughts or suggestions are appreciated.
Perhaps I need a preamp?
If I turn the volume all the way up the amp clips.
Pass DIY Addict
Joined 2000
Paid Member
I have built three separate (stock) ACAs over the past few years. Two are silent during power on/off and the third one emits a low squeal upon power up. I attribute the squeal to differences in caps used and differences in the switched mode power supplies that each uses. There is nothing "wrong" with it, it's just the way this one has functioned since day one.
Time to get a voltmeter and start measuring the DC of all the nodes in
the circuit on both channels.
the circuit on both channels.
Hello Mr. Pass,
I am a novice. By node you mean measure across each component? What exactly would I be looking for/signify a malfunction? DC offset? My speaker is fine as far as I can tell and I've been using this amp for months like this (listening in mono). I've only just now realized there is a problem.
Thank you both for your attention,
Y
I am a novice. By node you mean measure across each component? What exactly would I be looking for/signify a malfunction? DC offset? My speaker is fine as far as I can tell and I've been using this amp for months like this (listening in mono). I've only just now realized there is a problem.
Thank you both for your attention,
Y
Many of the problems of an amplifier are spotted by looking at the
DC voltages.
Presumably you built the amplifier and have a schematic as well as the
parts placement diagram.
For starters I suggest you take a copy of the schematic, and with the
amplifier running, identify all the points on the circuit that you can and
measure the DC voltage referenced to ground (RCA input ground will do)
and then post a copy of this marked up schematic here, along with the
same measurements (separate drawing) of the channel you think is working.
DC voltages.
Presumably you built the amplifier and have a schematic as well as the
parts placement diagram.
For starters I suggest you take a copy of the schematic, and with the
amplifier running, identify all the points on the circuit that you can and
measure the DC voltage referenced to ground (RCA input ground will do)
and then post a copy of this marked up schematic here, along with the
same measurements (separate drawing) of the channel you think is working.
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