Williamson first stage question

[catalin gramada]

I think the approach of using zenner diodes is wrong, they are sensitive when they heat up, there are other alternative solutions, have you thought about them?

 

[catalin gramada]

I have a bunch of this : SG 15P-2...unfortunately at max 30mA only.

 

[catalin gramada]

I think the approach of using zenner diodes is wrong, they are sensitive when they heat up, there are other alternative solutions, have you thought about them?

More, with a bit help of a 1.5w fan cooler zener temperature goes down to 32*C for 105 mA draw. Regulation is within 15V around meant less than 5 percent.

 

[catalin gramada]

...and making things more interesting. This unit should keep the zeners ice cool even at nominal 5w power rated...