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04-07-2020, 06:41 PM
Hi Makinrose
That circuit can just as easily use the Silonex LDRs, or any discreet assembly of a LED and light-dependent-resistor cell in heat shrink. It might be worthwhile to add a resistor in series with the diode to provide a current limit.
The author suggests the trem frequency range is wider but I always found the Fender range to go far too fast. Greater depth is nice to have.
As far as your proposal to link the LDR into a preamp stage via the cathode bypass cap of that stage, certainly that will work. The depth of effect might not be high if the basic gain of the stage is on the high side. You might also be able to replace the expensive LDR with a less expensive p-jfet. This might work better with the entire trem oscillator elevated by a volt or so to extend the gate drive range into the jfet.
Note that in the trem author's bandmaster circuit, the "improved" bias circuit is not much of an improvement. Were the link on the bias pot removed and a safety resistor added,things would be better. Also,a clamp for the bias filter caps would protect them. And as always, parallel bias pots for push and pull control allows hum-balancing of the output stage.
That circuit can just as easily use the Silonex LDRs, or any discreet assembly of a LED and light-dependent-resistor cell in heat shrink. It might be worthwhile to add a resistor in series with the diode to provide a current limit.
The author suggests the trem frequency range is wider but I always found the Fender range to go far too fast. Greater depth is nice to have.
As far as your proposal to link the LDR into a preamp stage via the cathode bypass cap of that stage, certainly that will work. The depth of effect might not be high if the basic gain of the stage is on the high side. You might also be able to replace the expensive LDR with a less expensive p-jfet. This might work better with the entire trem oscillator elevated by a volt or so to extend the gate drive range into the jfet.
Note that in the trem author's bandmaster circuit, the "improved" bias circuit is not much of an improvement. Were the link on the bias pot removed and a safety resistor added,things would be better. Also,a clamp for the bias filter caps would protect them. And as always, parallel bias pots for push and pull control allows hum-balancing of the output stage.
