Running laptop with 12V battery
Running laptop with 12V battery for HP-G62 Parts list: Step up converter 12v to 19v Resistor 4.7K Zener diode 6.8V Battery 12V Video: More information in the video
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Solar tracker circuit
This circuit is an one axis solar tracker. Today this circuit used in modern solar street light and solar systems in homes for increasing the efficiency. I tested it and work well. Best dc motor for this circuit is cordless drill motor (without removing gearbox)because that is very powerful and can move your heavy solar panel easily. In following video you can see how it work, however i test it without solar panel. Parts list: IC LM324 LDR(2pcs) Transistor BD139(2pcs) Transistor BD140(2pcs) Potentiometer 100k potentiometer 10k Diode 1N4007(4pcs) Capacitor 100n Resistor 47k Resistor 15k DC Motor 6 to 12v Please subscribe to my YouTube channel here: https://www.youtube.com/c/EngMousaalkaabi?sub_confirmation=1