Electronics Lab. Gadgets and Gizmos. The electronic hobbyist

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USB AVR In-System-Programmer

Nowadays, USB is the most popular connection connection between PC and peripherals such as AVR programmers, printers, scanners etc. For that reason I had to modify my old serial AVR In-System-Programmer (ISP) to work with USB connection. You can say, “use a USB to Serial adaptor to connect your AVR ISP with your PC”. Yes, [...]

Computer Controlled Battery Manager

BattMan II is a computer controlled battery manager, intended for typical rechargeable batteries used by R/C and electronics hobbyists, as well as various consumer product batteries. The project-write up is extremely detailed with hardware schematics & source code ready for download. Computer Controlled Battery Manager - [Link]

Build your 40 MHz Frequency meter!

This article shows how to build a small, cheap and simple frequency meter, without any fancy, out of reach components. The simple proposed design can measure frequencies up to 40 Mhz with errors below 1%! This degree of precision will be more than enough to debug most of your analog and digital circuits, and will [...]

Benito7 Arduino programmer

Feurig designed an Arduino USB programmer around the At90USB162 chip - [via] There were a few lessons that I learned at the Arduino Cult induction workshop that I put together this month. One of which was that I needed to simplify my programmer design on the cable end and not wait until I had a full [...]

CircuitPeople - View and share printed circuit board files online

CircuitPeople made a site where you can upload Gerbers in a zip file for easy viewing (PNG) via Make. Also check out gerbv. CircuitPeople - View and share printed circuit board files online - [Link]

5-Band Graphic Equalizer

This complete high quality, low noise 5-BAND GRAPHIC EQUALIZER circuit is based around Monolithic Linear integrated circuit LA3600 manufactured by SANYO. This circuit is very easy to build and has good Quality. You can use it with Portable component stereos, tape-recorders, radio-cassette recorders, car stereos etc… It is On-chip one operational amplifier. 5-band graphic equalizer for [...]

200W Audio Amplifier

This complete high quality, low noise mono audio power amplifier is based around the Hybrid Integrated Circuit STK4050 manufactured by Sanyo. The circuit incorporates volume and has a maximum music output power of 200W.The circuit incorporates an on board power supply; therefore, only centre tapped transformer is required to power the circuit. I t has [...]

Infrared cordless Headphone Amplifier

Using this low cost Project one can reproduce AUDIO from TV without disturbing anyone. It does not use any wire between TV and HEADPHONE. In place of pair of wires it uses invisible Infrared light to transmit audio signals from TV to Headphone. Without using any lens a range of up to 6 meters is [...]

Three Channel Audio Mixer

Above schematic is for a three channel audio mixer. That will provide an overall gain of one between the output and each input channel. Each input channel includes a single 0.1uf capacitor and 100-Kilohms resistor to provide an output impedance of 100K. The number of input channels to this audio mixer can be increased by [...]

Active Bass & Tremble Controller

ACTIVE BASS TONE CONTROLLER circuit diagram Active Bass & Tremble Controller - [Link]

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