- Attempted dual voltage regulator design by simulating using 2 LT1521-5's (LTSpice doesn't have MC79L05), Did not work at all
- Then I looked up dual-rail voltage regulator IC's (very few are through hole), they can supply positive and negative voltage ranges **cost about $10 for one chip
- Max600: provides +/-10V output form a 5V input, max current it can output is 10mA, Vo = 2Vi
- LT1026: more or less identical operation to MAX600, simulation results are correct, can supply over 10mA, unfortunately LTSpice takes a long time to Simulate that IC, **cost about $10 for one chip
- *****Solved the problem:
- https://www.eeweb.com/dual-supply-from-single-battery-source/
- https://electromagneticworld.blogspot.com/2017/05/cascade-circuit-voltage-multiplier.html
- Use MC79L05 to generate 5V dc
- Connect 9V source to 555 timer as a free running oscillator (astable mode) then connect output to Villard Cascade (Negative) Voltage multiplier, connect output of that circuit to MC78L05 to generate stable -5Vdc
- 555 timer can output up to 200mA, so we are in the clear
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