First time poster - this site's been really helpful for me, so thanks to all of you. I'm working on my first electronics project not from a kit, and am attempting to make a variable power supply. I'm using this schematic as a reference: http://www.ladyada.net/library/equipt/diypsupp.html However, I've modded it a bit:
I will be using a wall wart to power, and am planning on using a 19V power supply, with the option to use smaller adapters if necessary. I'm not certain if I got the symbols right, but the V and A represent a digital voltmeter/ammeter. My most pressing questions (in order of importance):
- What connection do I make with the ground that is located below R2?
- I'm interested in having a light-up switch for power. What would be the best way to draw the 12V it requires for the bulb?
- I can certainly test this one out, but I'm wondering if I have the voltmeter and ammeter connected properly.
- How might it affect my circuit if I increase C3 to be a 2.2uF cap? This may be what's available to me, and it seems like it won't impact the circuit negatively, but I want to be sure.
Thank you for any thoughts or suggestions!