JFET switching?

[blueduck577]

I was having problems with switch popping so I started to look into JFET switching like in boss pedals.  I came across an article by R.G. (https://www.premierguitar.com/Magazine/Issue/2007/Jun/JFET_Switching.aspx) with some helpful circuits.

It seems to work fine, but even when off there is a small amount of signal bleed.  If I feed it a really hot signal, it becomes audible and disgusting.  I read some other threads here about FET switching and I learned of the series-shunt switch, but I'm trying to keep the parts count down.

Any ideas?  I'm using J201s.  How does Boss get away without bleed problems?

[ayayay!]

Go to www.bossarea.com in their forum and search for the flip-flop circuit.  There's an excellent analysis of it there. 

[brett]

Hi
I'm no expert, but this surprises me given the high resistance of JFETs when they are off.  How many volts are you depleting from the gate, relative to the source?
cheers

[blueduck577]

here's the schematic, pretty much straight from the article



edit: this is just one "section" that I plan on duplicating for the individual switches.  right now i'm testing it as a muting circuit just to see what it can and can't do.  I don't know if it's worth it including the flip-flop circuit when I could just use a switch to send the control voltages.

[blueduck577]

as it turns out, the JFET was switching off, just the signal was leaking due to the signal paths being too close on the breadboard

thanks anyway you guys!