HAO - Rust Booster I + Rust Booster II LTD

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
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Manfred
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Post by Manfred »

My knowledge is too poor to discuss about it,
but i've just noticed that the NFB and gain network of the MXR D+ is very similar.
Yes, it is true, but I don' know the reason for this design decision.
This issue made me curious and I want to discover more about.

Sorry, I posted the wrong corrected schematic, but the only difference is the boost potentiometer type.
HAO_Booster_III_corrected_Schematic.JPG
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marshmellow
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Post by marshmellow »

Maybe their reasoning was to avoid the electrolytic capacitor. The bigger resistors only require smaller capacitors, which allowed the use of film instead of electrolytic. That is the only possible reason I can think of. Not sure that is much of an advantage though.

Any opamp will drive a couple of kOhm load impedance. If you want to optimize for noise, keep impedances low (but not the input impedance). That's also the reason why many modern lownoise opamps have enhanced output capabilities, so that they can drive lower impedance gain setting resistors. Additionally, lower impedances better restrict crosstalk within the circuit and interference pickup from outside the circuit.
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