Yes the collector (middle leg) connects directly to ground
And yes 3rd leg of the fet source leg
And yes 3rd leg of the fet source leg
Is the signal the same on both banks?
Is the signal on the base of the two drivers a clean square wave like this was before loading?
Is the signal on the base of the two drivers a clean square wave like this was before loading?
Replaced the chipset (494) and replaced the drivers again .
The drive is good all the way down to the gate resistor with it loaded then at the gate resistor the drive gets goofy like in the previous posts .
The drive is good all the way down to the gate resistor with it loaded then at the gate resistor the drive gets goofy like in the previous posts .
That's bad. What value are the pulldown resistors between the base of the drivers and the collector of the PNP driver (ground)?
If it's open, install something between a 1k and a 330 ohm on each driver pair to see if it helps.
If it's open, install something between a 1k and a 330 ohm on each driver pair to see if it helps.
Would the 2n4401 and 4403 work in the power supply as drivers replacing the c945 and A733 ?
The drivers I put it tested good but we’re used so wondering if I might have a bad driver somewhere
The drivers I put it tested good but we’re used so wondering if I might have a bad driver somewhere
There are 56 ohm resistors connected to the drains and 470 ohm resistors connected to the source legs
With no power applied, measure the resistance between pin 9/10 and pin 7 of the 494. What do you read on those two?
Resistance from pin 9 to pin 10:0.946k
Resistance from pin 9 to pin 7:0.474k
Resistance from pin 10 to pin 7:0.471k
Resistance from pin 9 to pin 7:0.474k
Resistance from pin 10 to pin 7:0.471k
You can use virtually anything. The PS drivers are not really critical. The 4401/4403 will be OK.
The pin configuration is different so you'll have to twist the base and emitter leads.
The pin configuration is different so you'll have to twist the base and emitter leads.