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.
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
Chipamp Audio Amplifier
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
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
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
Noise and Hum in Audio Circuits
Stereo Adapter for Portable Music Player Low Cost
Stereo Adapter 20 Watts for Portable Music Player
1984, Bass Treble and Presence.
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