Phantom trouble

MikkelM · Jun 12, 2004

Hi there
I have just used the Phantom power diagram from Bo Hansen.
I only get ca. 20V out on Darlington pin3!!!

measument on the Darlington pins, with the Darlington not inserted.
Pin 1 and 2: 22.7

Is the Darling fried??

THanks

Mikkel Meyer

sismofyt · Jun 12, 2004

Whoha! Big schematic :green:

If you don't have 'bout 51v across the zener, I'd look into the voltage doubler..

When transistor die they nearly always die 100%...

MikkelM · Jun 12, 2004

Ahrhjaa Gaaa!!! I have done some completely stupid on my PCB.....
Fuck simple circuts, because they are simple!!

MikkelM · Jun 12, 2004

Well I already have one rectifier to DC voltage.
So if I skip the 1N4002, wouldn?t it work then??

sismofyt · Jun 12, 2004

I'm not quite sure what you mean, Mikkel :?:

If you allready have rectified the AC to DC you can't use the voltage doubler part. The doubling is 'happening' in the rectification, so to speak.

I'd say you either follow the circuit bit by bit OR use a standard 50VAC trannie and rectification. Makes sense?

SSLtech · Jun 12, 2004

Nope. You have to give this thing truly alternating current for it to work.

Keith

MikkelM · Jun 12, 2004

Yes! I see.. I have pulled it all away, have been sitting with this small thing too long.. It only outputs in silly panic questions... Sorryyyyy!

Bo Hansen · Jun 12, 2004

Hi Mikkel,

To get the voltage doubler to function you must feed the input with AC only. (aprox. 24 volt)

--Bo

Phantom trouble

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