Hobby Projects - Insulation tester, LED Circuits, Meters.

Sunday, May 08, 2016

Music Sound to light converter

This was made by me when i was a kid, it was even published in a magazine, i think it will work, it was used on a very old huge ornamental valve philips stereo system in the remote speakers.

Recently i captured this circuit in eagle to publish online, it seems to have a small design error. It worked well for many years. The step-down transformer is used as a step-up here. The secondary winding was around 50mA so the resistance was protecting the 2N2222. (SL100 was used in the original one). C1 and R3 may need tweaking to get the desired adjustment range in R2.

Circuits using only discrete devices

Music Sound to light converter

The voltage across the speaker is fed to C1-Gnd, which blocks DC component. R1, R2, R3 form a threshold bias for T1. 2N2222 chops the 12V DC in tune with the music. The chopped DC current flowing in the 12V winding of TR1 is stepped up into AC pulses over 100V, this lights the Neon in flashes synchronizing in real-time with the beats. Known Issues - It does not perform well at low Bass like 20Hz.

Thursday, May 05, 2016

Tinkerlog of Alex – Embedded Experiments

Log about Alex's experiments with microcontrollers. Some nice embedded micro projects here Programmable LED, Synchronizing Fireflies, (Elektor), 64 pixel led display with animations.

Tinkerlog of Alex - Embedded Experiments

Faster prototyping. Easy to build, even for beginners. Comes with a 3 AA cell battery holder. Uses ATtiny2313V-10PU microcontroller.

Tiny2313 Proto Board

Tiny2313 Proto Board

"This Tiny2313 Proto Board is for all these one-off projects and prototypes. You want it more permanent than on a breadboard but don’t want make a custom PCB for it. The board comes with 10 components only and is really easy to solder."

Programmable LED How To

This is a tiny blinking device. The blinking sequence can be reprogrammed with the use of a flash light. It detects changes in lighting and records these changes and finally plays them back.

Tuesday, May 03, 2016

Build Your Own Microcontroller Projects

These pages created by Wichit Sirichote of  Department of Applied Physics, Faculty of Science, provides schematic and software for hobbyists to practice "learn by doing", build a simple microcontroller projects at home.

Build Your Own Microcontroller Projects

Some of the projects include - The 4 Channel Pt100 Thermometer, G5-Data Logger, Solar Recorder,    89S52 and PIC Project Board. Even circuits, code and SBC for the popular 8051 can be found here.

Build Your Own Microcontroller Projects

Dual Channel Digital Volt Meter

"I do remember the Intersil ICL7135 very clearly. This year 2011, almost 29 Years, the classic integrating type analog to digital converter is still interested. With a cheap price and easy interfacing, I think I will design a cheap digital volt meter with microcontroller to provide serial interface similar to the Fluke45. Two channels is good for scientific experiment."