Byron A Jeff
- Jan 1, 1970
Forgive me for the simplicity of this question but I'm rather new to
electronics. I want to build a homebrew benchtop power supply and would
like a bit of feedback before I try:-
1. What potential uses does a dual polarity supply have - are they harder
Good for circuits that do audio. Also circuits that use opamps may or may
not need a dual polarity supply.
2. What sort of current am I likely to require for simple electronics
Usually less than 1 Amp. This requirement may change if you're building
something with electric motors whough.
3. Is isolating a power supply from the mains supply difficult?
Nope. The component is called a transformer. BTW you'll probably want to
put a fuse or circuit breaker on your primary of the transformer in case of
4. What regulator IC should I consider for a beginner project? I was
considering LM137, only on grounds of cost and simplicity - is this a good
As good as any. Did you want variable voltage? This it's the ticket. Just
take care with the max voltage and power dissappation on the part. You'll
probably have to heat sink it to draw off the excess heat.