It was a 21844s. One of the drive transistors failed. Ive got it back to When I start the amp up the relays click and the drive disappears. No fets are in the output section
What's the DC voltage on the larger output filter inductor before the relay closes?
Do you get modulation of the carrier before the relay closes when the amp is driven with a signal?
Do you get modulation of the carrier before the relay closes when the amp is driven with a signal?
Yes but only if there is still rail voltage when I fire it up. If I turn it on with empty rails I get no drive wave at all
I get 0v on the inductor
I get 0v on the inductor
When it starts from 0 rail voltage and builds rail voltage but no rail-rail carrier, can you see the audio drive signal on the input pin of the driver board?
The rail voltage is jumping around while it builds. I know u hate video but I attached a video of what it's doing.
Well... I used to watch video but I can't remember seeing a single one being of any use. I appreciate you trying to reduce the trauma for me by using an analog scope.
Which question (post #) was this supposed to answer.
Some of these self-oscillating amps need a bit of a kick to get them to start oscillating. I asked about the drive at the driver board when it refused to go rail-rail to know if it was possibly not starting because it was not seeing a signal, at the driver board input.
Which question (post #) was this supposed to answer.
Some of these self-oscillating amps need a bit of a kick to get them to start oscillating. I asked about the drive at the driver board when it refused to go rail-rail to know if it was possibly not starting because it was not seeing a signal, at the driver board input.
I put new 21844s chips it and it starts up every time now. it looks like it's trying to start with little blips