Newest circuit diagrams

1.5 to 37 Volt 30 Amp Power Supply

A modification to the 12V 30 Amp power supply. This version uses an LM317 to provide a variable 1.5 to 37 Volt regulated output with currents up to 30 Amps. Max has built his power supply into an old computer case and can be seen on YouTube under Project Icarus.

Dual Regulated PSU

In this circuit, the 7815 regulatates the positive supply, and the 7915 regulates the negative supply.

Fast Electronic Fuse

A fast electronic fuse designed to operate on 230V AC with an adjustable trip current.

Motor Reversing Circuit

the motor cannot be switched from forward to reverse unless the stop switch is pressed first.

15 Watt Amplifier

A 15 watt amplifier made using discrete components. Sergio designed this circuit for his Electronics Level II course.

Infrared Switch

This is a single channel (on / off) universal switch that may be used with any Infra Red remote control using 36-38kHz. (This is a very common remote handset frequency). In place of IR1 a TSOP1738 receiver may be used.

Variable Voltage Regulator

Variable Voltage Regulator

10 Way Electronic Switch

This is a 10 way electronic latching switch using just two push-to-make switches. Each output can be latched on and off independently.

Quadraphonic Amplifier

This is a four channel amplifier ideally suited for use with quadraphonic equipment such as a Sound Blaster Live card. There is no volume control,audio levels being directly controlled from the sound card itself.

A Passive Ethernet Hub

I tested this concept on a little network consisting of three PCs running under Windows 2000. It works well. The network adapters are normal Intel and 3Com models, set to 10 Mbps and Half Duplex. The computers are labelled A, B, C, and the UTP cables from the computers to the hub are 10, 16 and 35 meters long, respectively.