Help Phono 2 PSU HT High

[bob orbell]

Colin, looking at my spare zeners they read 1N 5388B, these are 200v.

[bob orbell]

IN 5378B is the 100v diode according to the RS site. BOB

[colin.hepburn]

Originally Posted by bob orbell

IN 5378B is the 100v diode according to the RS site. BOB

BOB. Yes that would explain the 106v out i was sold this as a 200v so i have only two of them can i use them in series to get the 200v out

[bob orbell]

Not shure on that Colin, I know if you put two Zeners back to back it acts as a clipper diode (AC). If you want I can post you one of mine. BOB

[colin.hepburn]

Originally Posted by bob orbell

Not shure on that Colin, I know if you put two Zeners back to back it acts as a clipper diode (AC). If you want I can post you one of mine. BOB

BOB if you have enough spares yes please can always replace it for you later got to take dog out he,s crossing his legs i will PM you Later thanks

[John Caswell]

Hi Colin et al,
Yes you can stack zeners of any voltage to provide the voltage required.
If you allow 10mA for zener current plus whatever current and voltage you wish to drop and do the usual Ohms law calcs.

John

[colin.hepburn]

BOB you have PM

[bob orbell]

On its way Colin, I have put in .1uF cap to bypass the zener. BOB

[colin.hepburn]

Originally Posted by bob orbell

On its way Colin, I have put in .1uF cap to bypass the zener. BOB

Ok BOB
Thank you muchness
Colin

[colin.hepburn]

Hi all
Well ordered a new DMM just another cheap one for the time being I think it’s got overload protection but not sure if this means for setting the wrong range or not
I have always avoided a really good DMM for use on valve stuff maybe am auto ranger is with i should go for