Are you really frustrated at the time you’re cannot find the suitable and simple negative power supply when you need it the most?
Well, isn’t doing an electronic project should be a fun test? You can immediately change the above unhappy moment into a joyful moment.
How? Well, all you have to do is create the simple negative power supply for your own need!
I’m know building a -5V from a battery is a little bit tough. For this problem, I’ve decided to build a small device, which it will provide either -5V, -12V or -15V easily.
You can use the MAXIM 764/765/766 series, a little modification on the chip needs to be done on it, for the good output results.
As you can see it at the below schematic, we will use four capacitors in this project which:
C1 – 120µF, 20V
C2 – 0.1µF
C3 – 0.1µF
C4 – 68µF, 20V
However, for a greater current output, we should choose to use the 220µF instead of the 120µF.
Isn’t this is a cute and small gig? [source]
Interesting idea!