BAJA LA2A Style Optical Limiter  [documentation]

Original effects with schematics, layouts and instructions, freely contributed by members or found in publications. Cannot be used for commercial purposes without the consent of the owners of the copyright.
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Serge75
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Post by Serge75 »

Hallo Frank, modifying the circuit, did It envolve changing componente values, or just using -9v as previous ground, 0v as prev Vref and +9v being the same, would you mind sharing the changes? Thank you!
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Frank_NH
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Post by Frank_NH »

Hi Serge75,

Yes, just run the op amps at +/- 9V and use ground for Vref. For the jfet buffer, you can use +/- 9V as well, but I used an op amp buffer instead. My split supply comes from a LT1054 charge pump. Note that the 4.7k resistor in the Limit part of the circuit is connected to -9V and lug 1 of the output pot is connected to ground.

Frank
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snk
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Post by snk »

Hello,
I am just chiming in to say thank you to Bajaman : I just built the Opto Limiter today (after building the Diamond Compressor a few days ago), and it's a very nice circuit.
A home-made vactrol works fine.
I used a 5534 op-amp for the first op-amp, as a 353 was producing some distortion.
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