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Josh Pardes![]() |
Passive Midrange control Does anyone out there have a schemo of a passive midrange cut/boost (like the Torres Super Midrange)? I find it hard to believe that the mids can actually be boosted in a passive circuit. A couple of years ago I had a US Master's LeGrande (basically their version of a strat). The tone control was amazing. As you turned it down it would focus the mids sort of like a wah pedal. When I was wiring up new pickups in it, I paid note to the design. It did not have an inductor coil. If memory serves correctly, it was a resistor and a cap only but I was dumb enough to sell that guitar (slapping head.. stupid stupid stupid!!!). If anything, I wish I had drawn out the the circuit before hand. Does anybody out there know how to do something along those lines? Common sense tells me that it was a cap and resistor running in series (maybe even parallel - brain not functioning at full capacity this late at night) but I have no idea of the values including the pot. It would totally make my day if someone knew how to do this as it was the most useful tone control I have ever used. Suggestions welcomed. Josh |
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Steve A.![]() |
Josh: Here is the circuit that I have used in a few guitars: http://www.blueguitar.org/new/schem/_gtr/dual_mid.gif With the push-pull pot down it is a mid-cut control which is fairly neutral when set to 10. With the push-pull pot pulled out it is a mid-cut-boost control which is supposedly neutral when set to ~7. However, when I finally tried an A/B test you could definitely tell when the circuit was bypassed. I find it hard to believe that the mids can actually be boosted in a passive circuit. You are correct... the mids are not boosted with the passive circuit, but just cut less than the highs and lows so the net effect is like a boost- only the overall signal level is cut. ![]() Steve Ahola P.S. I find both versions of the passive mid control to be useful- the mid cut cleans up the signal a lot while the mid boost will dirty it up a bit. |
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Josh Pardes![]() |
Steve, thank you so much, I have been trying to track down something like this for quite some time now. I had suspected that it used an inductor, but the circuit is a little more complex than I had anticipated. It makes sense though since it is cutting highs and lows to pronounce the midrange. Pretty cool! ![]() ![]() Josh www.handwounds.com |
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