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Power Circuit
Source A simple but less efficient methode of controlling a DC voltage is to use a voltage divider and transistor emitter

Led Circuit
The circuit below illuminates an LED to indicate unequal charges between two 12 volt lead batteries

Analog / Rf Circuit
Filter A bandpass filter passes a range of frequencies while rejecting frequencies outside the upper and lower limits of the passband

Miscellaneous
Here are two examples of bistable flip flops which can be toggled between states with a single push button

Light,Motor and power control
A pulse width modulator (PWM) is a device that may be used as an efficient light dimmer or DC motor speed controller.

Computer
Here is a simple technique for measuring frequencies over quite a wide frequency range