crossfire vr4000

[Perry Babin]

I think I'd try two 9v Zeners if they're connected like the ones I mentioned earlier.

[timwebb]

ok. im ordering them. in a day or two.

[Perry Babin]

Be aware that if those are not close enough to the originals or are being used in a different way, it may blow the output transistors.

[timwebb]

are the diodes are used to stabilize the output drivers? would it be a way to buffer it. if there were a spike in the voltage?

[Perry Babin]

I think they're there to limit the voltage reaching the gates of the FETs. It's just a guess. I rarely see the DLM based amps and have never seen the driver board that you have. You may be able to confirm that that's how they're connected if one end of the two diodes connects to the source leg of the FETs and the other end of the two diodes connects to the gate resistors.

[timwebb]

i cant find the 1N4237 diode.

[Perry Babin]

Why do you need that diode?

Are you sure that that's the right number?

[timwebb]

i was buying a few of each for testing

[Perry Babin]

Where did you get that number from?

[timwebb]

Originally Posted by Perry Babin

That's not true for most MELF diodes. Most have no indication as to their rated voltage. In some of the other DLM boards, they used a 1N4237 and a 1N4740 connected in reverse series configuration. I'd suspect that these are similar. You would need at least one good pair to test to know what they really are if you can't get that information from the manufacturer.

i were going to order these for tests.