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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.

Passive volume control with Potentiometer

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.

GainClone Chipamp Audio Amplifier

Music Sound
                        to light converter

The Source file is here del00005.zip



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.

Constant Current Source LED Drive - A safe and Simple Led Lighting Circuit.

Stereo Audio Music Players

40 Watts Hi-Fi Music System - Stereo Music player with Tuner, 1986, LED VU meter and Analog VU meter.

RCA connector or Phono Connector


SAN 20 Stereo Music
                        Player

This was done as repairing home electronics was my hobby in school days, I learnt by building Amplifiers based only on transistors from the Old Philips Circuits and Books. The above one is TDA2020 20 Watts Per Channel, with LED input level meter and moving-coil output meters. It would have a 5 pin din input and RCA speaker output, input for phono, tape, etc. The Speakers had a woofer, tweeter and midrange with passive
crossover network.

Noise and Hum in Audio Circuits


 SAN 20 Woddedn
                        Speakers with Crossover Network

Stereo Adapter for Portable Music Player Low Cost Stereo Adapter 20 Watts for Portable Music Player 1984, Bass Treble and Presence.

 Portable Music
                        Player

This was a TB810 based 10+10 Watts Stereo Amplifier with LM381 or 2 Preamplifier, The portable player docks in a wooden cabinet. There was no IR, Wi-Fi or Bluetooth in those days, so the device would interface with amp thru a stereo ear-phone socket-jack system with a shielded cable. Bass, treble and Presence as per an old phillps audio amp book.