N. Williams & J Leo, Organ Tremulant Vibrato Phaser, Electronics Australia, March 1969 🇦🇺

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modman
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BMS1971
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I did try it but not really working... Needed to boost signal at input and oscillation is really not stable...
"Eddit", wen I added the 4 missing resistors, work like a charm, not the most powerful phaser vibrato but very pleasant. I had great results with NSL32 optocouplers. but I will try LED/LDR tomorrow again, I tried some today but background noise was BIG...

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Eddit, the only problem I'm facing is that to have enough electricity to fully run the leds, the darlinton pair for the leds overheat...

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Post by BMS1971 »

Update on built:
1 the best is to use only one lamp for all 3 LDRs à la Univibe.
2 USE trimpot in series with resistor (82R) on darlington who drives lamp effect is very sensitive to lamp brightness
3 40408 can be replaced by BC141
4 I used BC108B from CDIL

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