45% is very low. It may be normal for this amp.
Have you done any testing to see if the low duty cycle is causing any problems?
Have you done any testing to see if the low duty cycle is causing any problems?
I'm not sure what you're asking. Low duty cycle at high power can cause the primary filter caps to fail if there aren't any primary filter inductors (or if they aren't of sufficient value). To test, you'd drive the amp to high power (at least 1/2 power) and monitor the temperature of the primary filter caps. If they heat up significantly, there may be a problem. If the amp performs as expected and nothing heats up more than expected, it may be normal for this amp.
If you need more help, post a photo showing the entire board. I looked online to try to see what it was but didn't find anything useful.
If you need more help, post a photo showing the entire board. I looked online to try to see what it was but didn't find anything useful.
the power supply seems to be functioning. i have pos. and neg. rails but no wave on the outputs.
Do you have signal reaching that board?
Do you have the 12v supply that's referenced to the negative rail?
Do you have ±5v on the power supply pins (4 and 8) of the two adjacent ICs?
Do you have the 12v supply that's referenced to the negative rail?
Do you have ±5v on the power supply pins (4 and 8) of the two adjacent ICs?
Yes I am getting signal on pin 10 of the driver board. When I use pin 17 for ground and test pin 18 it shows .555v. Same for the other side of the board
Don't ground your scope to pin 17. It's at negative rail and will damage the ground in your scope. Measure with a multimeter (or a battery powered scope or your scope in differential mode).
Do you have rail voltage?
Do you have rail voltage?
Ok so I'm getting the 5v on the tl072's and 12v above the negative rail and signal to pin 10. Does that indicate the irs21844s chips are bad?
You have to be precise. We only know what you tell us. Do you have both positive and negative 5v on the TL072?
There is only one TL072. The other is an LM211.
We're not to a point of saying what's defective.
Do you have signal (swinging positive to negative 5v) on the output of those two 8-pin ICs?
There is only one TL072. The other is an LM211.
We're not to a point of saying what's defective.
Do you have signal (swinging positive to negative 5v) on the output of those two 8-pin ICs?
sorry if this is frustrating. its been a few months since ive done this. if you could tell me what to do like im an idiot(put black probe at xxx and red probe at xxx) it might be less frustrating. thanks in advance for your patience.