Help - Actually Hate the P3 Driver...

[drlava]

is the cap necessary for all diodes wired in series andrew, or just the blue ones?

I'd suggest adding it for all diode types, just to be sure. It's not necessary in all installations but some users have reported capacitive coupling between the first diode in the set and the casing which can give it spikes because it's riding at a high voltage relative to ground and the other diodes.

I'm planning a 'break out board' for the new driver to be used with series setups that will simplify all of this.

[LesioQ]

I see You're not isolating the driver's transistor from baseplate ...
Piotr.K

[dnar]

I see You're not isolating the driver's transistor from baseplate ...
Piotr.K

No need, it's an isolated plastic package.

[andy_con]

ok more issues...

probably my fault but im blaming the driver

now i know this setup works as ive done it before



now ive got a same setup, 4 diodes wires in parallel with correct resistor. input voltage is 9v but i can only seem to get 250mw out of the diodes, the driver wont give anymore power.


help....

[Solarfire]

ok more issues...

probably my fault but im blaming the driver

now i know this setup works as ive done it before

Are those 2.2 Ohm balancing resistors you got in there? If yes I believe that's too big for a 9V supply. Can your supply deliver at least 5A continuous? If yes then maybe you should try a 12V supply or smaller resistors around 1 Ohm.


Cheers!

[dilbert]

Andy, I've had a good look at the pics and got an idea - are they both doing it or just one?

ok more issues...

probably my fault but im blaming the driver

now i know this setup works as ive done it before



now ive got a same setup, 4 diodes wires in parallel with correct resistor. input voltage is 9v but i can only seem to get 250mw out of the diodes, the driver wont give anymore power.


help....

[andy_con]

both sets doing it

[DTR]

Have you tested to see what the voltage is being supplied to the Modulation input(M+)? Just thinking.

[andy_con]

tried two different 5v psu, so know thats correct

[DTR]

I was going to suggest you use something to bridge the V+ and M+ temporarily to be sure since you are now only running 9V. But you said that you are sure.