Newest circuit diagrams

555 Pulse Generator

A 555 pulse generator circuit with a difference, the initial pulse is tailored by additional circuitry to match the duration of subsequent pulses

Universal DC-DC Convertor

This circuit will generate a smaller DC output voltage from a larger DC input voltage.It is quick and simple to make and by changing the value of the zener diode, the circuit can be universally adapted to provide other output voltages.The circuit and all diagrams represent a DC convertor with 12V battery input and 9Volt DC output.

1.3 Volt Power Source

This is a replacement power source for 1.3V mercury cells or other small batteries. It has many uses and I use this circuit in my computer to power a front panel multi adapter which has a digital thermometer.

Simple Color Organ

Three Lamp-Channels Output. Built-in Electret Microphone

Mini Portable Guitar Amplifier

Can be fitted into a packet of cigarettes. Also suitable as Fuzz-box

Low Voltage Preamplifier

A low voltage preamplifier optimized for 3 Volt operation.

24 Watt Class A Amplifier

A 24 Watt Class A Amplifier made from discrete semiconductors, built and tested by Marc Klynhans from South Africa.

Frost Alarm

A simple thermistor triggered switch with adjustable threshold. It triggers with cold temperatures so may be used as a frost alarm or cold temperature switch.

Asymmetric Timer

A timer circuit with independent mark and space periods.

The GEM Class-A/AB Amplifier