The zener sets the output voltage. Its just 4 one watt 10 or 12 volt diodes in series.
Just use what combination of zener diodes you need to get the right voltage you want. Three 12's would give you 36 volts too.
R1 is needed but R2 is optional.
I never use R2 in any of my power supplies like this. I just add it so the electrophiles dont ***** too much when ever I post a schematic like this.
For an AC output just pull power off the AC side of the rectifiers and use the DC side as the voltage regulator. C2 can be reduced by a factor of ten for that type of application. Depending on the load the zener diodes may need to be changed to higher voltage values though.
Just use what combination of zener diodes you need to get the right voltage you want. Three 12's would give you 36 volts too.
R1 is needed but R2 is optional.
I never use R2 in any of my power supplies like this. I just add it so the electrophiles dont ***** too much when ever I post a schematic like this.
For an AC output just pull power off the AC side of the rectifiers and use the DC side as the voltage regulator. C2 can be reduced by a factor of ten for that type of application. Depending on the load the zener diodes may need to be changed to higher voltage values though.