Transformer with uneven ac out

geminni

Member
2006-12-26 2:05 pm
I need 2x15v supply for preamplifier. I have a transformer with two output. One is 23v and second is 30v. Two windings are connected together.
Can i connect it to a rectifier? Will this voltage difference bother?
If it is ok then i will also use zener, transistor to lover voltage at 15v dc.
 

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geminni

Member
2006-12-26 2:05 pm
It's working!
Now i have +-40,5V. How can i make +-15V for preamp?
I have been looking in LM317 data sheet, looking on net and found that its maximum input voltage is 40v. :bawling:
Would the classic zener-transistor combination be enough for preamp?
I ask because i have made same setup for amplifier with TDA1516q and it distorted very bad on higher power output. When i replaced zener-transistor with 7815 it worked very nice. No distortion on louder volume.