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LED VU Meter
The circuit below uses two quad voltage comparators (LM339) to illuminate a series of 8 LEDs

Battery Equal Charge Indicator
The circuit below illuminates an LED to indicate unequal charges between two 12 volt lead batteries

40 LED Bicycle Light
The 555 circuit below is a flashing bicycle light powered with four C,D or AA cells (6 volts).

AC Line powered LED
The circuit below illustrates powering a LED (or two) from the 120 volt AC line using a capacitor to drop the voltage

Analog Milliamp Meter
Used as Voltmeter A milliamp meter can be used as a volt meter by adding a series resistance

Infrared Remote Control Tester
This is a fairly easy circuit that can be used to test TV and VCR remote controls.

Transistor Schmitt Trigger Oscillator
Oscillator The Schmitt Trigger oscillator below employs 3 transistors, 6 resistors and a capacitor to generate a square waveform