Shunt regulator +-15V

[zoom777]

@dadod , I don't think you mentioned but i guessed as much that one of them is for load sensing. For this functional test, i simply short them on the psu board.
Thank you for confirming that.

 

[shattered_dream]

I got this PCB when I bought an R2R DAC... This DAC needs +-5,V... So the only thing I have to change is the value oft those resistors mentioned?

 

[dadod]

I am not sure if it will work so low as +-5V, look here https://www.diyaudio.com/community/threads/shunt-regulator-15v.286425/page-8#post-7535193
I will try to simulate it tomorow.

 

[dadod]

Simulation showed that is possible to get +-5V if you change those resistors, but you need to decrease input voltage too, use transformer with lower secundar voltages.

 

[shattered_dream]

I got +-9V AC... Think that will be ok.... Size of R2/R9 ? 22 Ohm ?

 

[dadod]

Chose the value to get the current trough it close to 10mA.

 

[shattered_dream]

Hmmm which Zener diodes can I use there ?
The BZX84C10L seems to be not available...

 

[zoom777]

BZT52C10-TP
I used these and they work nicely.

 

[shattered_dream]

Another stupid question... SInce I want to use a transformer with +- 9 V and Output of +-5V....
Is this zener diode of any use ?
In my simulation theres always 0 V between the zener diod and the resistor....

 

[dadod]

Zener diode is just for mofet protection, probably of no use in your case, but just leave it.