Schematics / Electronic Projects
Digital Echo
We decided that about half a second between echoes would be more than adequate for a maximum delay range. The shortest delay is so fast that sounds resembling microphone feedback can be obtained. Metallic alien reverberations similar to those on the "Smash" instant potato television adverts are also possible....
Diode and LED Tester
The simple Diode and LED Tester presented here costs under £5 to build (including all components, the battery and a cheap case) and will indicate the polarity of almost all types of LED and other diodes with no risk of damage....
Disco VU Lights
Seven lamps were controlled by the original unit, using individual comparators, whereas the design presented here controls ten lamps and utilizes a bargraph driver IC. The effect is emphasized by reducing the difference between......
Dynamic Range Processor
The Dynamic Range Processor presented here allows the dynamic range of a signal to be increased (expansion) or decreased (compression) by a variable amount up to 3:1. ...
Eprom Emulator
This EPROM Emulator was designed to compliment the EPROM Programmer (Mark 2). The unit presented here will emulate the standard 27 family of devices, from 2764 to 27512, and can be used with an IBM PC compatible computer. ...
Eprom Programmer Mark 1
The EPROM Programmer presented here will program the standard 27 family of devices, from 2716 to 27512, and can be used with any computer which has an RS232 serial port....
Eprom Programmer Mark 2
The EPROM Programmer presented here is designed to address these requirements, and can be used to program the standard 27 family of devices, from 2764 to 27512....
Eprom Programmer/Emulator PSU
This simple power supply unit was designed for use with the EPROM Programmer Mark 2. It is equally suitable for powering the EPROM Emulator....
Graphic Equalizer
The five band graphic equalizer described here was designed to connect between two video recorders, so that the frequency response can be corrected somewhat....
Electronic Project Schematics - Headphone Amplifier
A low power stereo amplifier capable of driving a pair of headphones, and some method of allowing this to be connected to the 9 pin socket on the MegaDrive, along with the RF modulator....