Ill keep that in my brain forever thanks...i should have just used my meter on the resistor instead of relying on google. Funny thing i know the color stripes chart by heart...lol 1% tolerance... damn thats pretty good. They are all 1 percent shy of there rated 220 ohm...
I dont think anything exsesive i have been pounding it hard and its cool as a breeze. Very happy....thanks perry...it sounds great...
Well it's been a while my friend hooked the polarity backwards I think.. and I tore it all down and this is the problem I'm dealing with on q37a and q38a. The first pic is the rest of the transistors but the second pic is the 2 I'm having a low voltage issue. What would cause this?
Attachments
In the amplifiers I've seen (of this type), all of the drivers are fed by the same voltage source. Do the collectors of all of the NPN drivers have the same voltage?
Are these the waveforms from the emitters follower pairs?
Are these the waveforms from the emitters follower pairs?
The drivers are in an emitter-follower pair configuration. Their emitter terminals drive the gate resistors which drive the PS FET gates. In the attached diagram, all of the NPN drivers are fed from the source marked 7500VCC.
Do the collectors of the NPN driver transistors all have the same DC voltage?
Do the collectors of the NPN driver transistors all have the same DC voltage?
I figured it out. one of the drivers collector wasn't making contact with the pad.. but looking at the duty cycles in the previous image. Is 43%+ and 57%- normal? Why wouldn't it be 50/50?
Do you still have unequal duty cycle for the two drive signals?
Is it the same at the output of the PS driver IC?
Is it the same at the output of the PS driver IC?
The duty cycles were the same between the two outputs of the tl494 I just thought the off and on times would be even but it's probably just for a safety cusion so they arnt on at the same time. But I have 4 fet pads when load testing look funny. Does this just mean the drivers are bad? Pic 1 is a good load test pic 2 is the funny one. I was load testing with the 47 nano farad cap.
