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Music Sound to light converterThis 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. 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. The Source file in CadSoft EAGLE format is here del00005.zip |
