Replacing 4066 with jfet switch?

[DSV]

Hi all,

I am experimenting with a Rockman Compressor, based on this schematic:


In Clean mode, the compressor acts like this:


whereas in Edge mode there is less mid cut in the pre-compression filtering, and the gain of the compressor stage is reduced:


I'd like to modify the control circuitry for the compressor modes by replacing the 4066 with one JFET, since I'd be using only one switch (I am planning to use only Clean and Edge modes). Would this schematic work?

(NOTE: I'd use a JFET with a resistance RdsON = 300-400 Ohm, good IMHO for replacing the resistance of 2 4066 switches and having the same behaviour in clean mode).

Thanks,

DSV

[dschwartz]

i think you can get away with it, since it looks like the 4066 gates are only for "on-Off" switching

[DSV]

Thanks, I'll try it then 

[brett]

Hi
why not use a MOSFET switch?  Lower on resistance and a similar "on" voltage to the 4066.  A BS170 or 2N7000 would work. If you need to avoid the effects of the body diode, go for a power MOSFET such as an MTP3055 (about 60V) or an IRF (40 to 400V).
cheers

[dschwartz]

someone told me once that mosfets don´t do good switches...unless they´re on a inverter config (like 4066)..i don´t remember why..something about gate threshold?