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Constant Current Battery Charger
Charger A simple method of charging a battery from a higher voltage battery is shown in the circuit below to the left.

Light Activated Relay
This is same circuit as above with the addition of a photo resistor to trigger the flip flop instead of a push button

Simple Adjustable Voltage Source
Source A simple but less efficient methode of controlling a DC voltage is to use a voltage divider and transistor emitter

LM317T Voltage Regulator with Pass Transistor
With Pass Transistor The LM317T output current can be increased by using an additional power transistor to share a portion of the total current.

2 Cell Lithium Ion Charger
This circuit was build to charge a couple series Lithium cells (3.6 volts each, 1 Amp Hour capacity) installed in a portable transistor radio.

120 VAC Lamp Dimmer
The full wave phase control circuit below was found in a RCA power circuits book from 1969.

Variable 3-24 Volt / 3 Amp Power Supply
This regulated power supply can be adjusted from 3 to 25 volts and is current limited to 2 amps

Low Voltage, High Current
Circuit In this circuit a LM339 quad voltage comparator is used to generate a time delay and control a high current output

12 Stage Neon Sequencer (NE-2 / NE-51)
This circuit is similar to the LED clock using 12 neon indicator lamps instead of LEDs