The credit goes to Bigclivedotcom. Very impressive.
Here is a simple way to use up them dead batteries that gets thrown away.
With this system, you can get your money's worth out of all them batteries that once they reach 1 volt, they are done with.
I used a 2K resistor from one end terminal on the toroid coil to the base of the transistor. Its centertap to the positive rail and its other end terminal to the collector of the NPN 2N2222 transistor. The 3 LEDs are connected in parallel between the collector and the emitter.
Негізгі бет Light up 3 LEDs using 0.4 volts DC. Read description
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