SOLVED Simple Jfet buffer wiring

[MichaelW]

I'm not sure if this really belongs in the "Troubleshooting" forum but I thought I'd start here.

I incorporated the Simple JFET Buffer board from PPCB into my latest build, the Constrictor compressor. This was more or less an experiment in using a unity gain buffer that I figure could be easily reversed if I didn't like it.

I'm not sure I wired it correctly and it's got some unintended consequences with the way I wired it.

I could not find a lot of information about how best to use this board and a search of the forum didn't really make things much clearer on how others have this wired.

What I was intending was a buffered effect that the buffer turned on and off with the effect. In an attempt to keep the wiring as clean as possible, I decided to install the buffer board inline between the footswitch and the main PCB. If I'm understanding this correctly, in this configuration the buffer is before the circuit and "should" take advantage of the power filtering and polarity protection of the main board.

I have the "In" from the buffer board wired between the "In" pads of the main board and 3PDT board.
I have the "out" from the buffer board wired between the "out" pads of the main board and 3PDT board.
Same goes for the Ground pad.
For 9v power I have the 9v pad on the buffer board wired between the SW pads between the main board and 3PDT board. (I think this might be where some of my problem comes from).

The rest of the 3PDT board is wired as usual.

So the two issues I am having is:
1) The status led is always on. When I turn the effect on it gets brighter but even when the effect is off the led is on.
2) I'm getting an annoying pop when turning the pedal on and off. I found a post where @Big Monk added RPD's to address this but wasn't clear how he added them or where.

I am open to suggestions of a better way to wire this board (or someone to tell me what I did wrong...

 

[Big Monk]

I'm not sure if this really belongs in the "Troubleshooting" forum but I thought I'd start here.

I incorporated the Simple JFET Buffer board from PPCB into my latest build, the Constrictor compressor. This was more or less an experiment in using a unity gain buffer that I figure could be easily reversed if I didn't like it.

I'm not sure I wired it correctly and it's got some unintended consequences with the way I wired it.

I could not find a lot of information about how best to use this board and a search of the forum didn't really make things much clearer on how others have this wired.

What I was intending was a buffered effect that the buffer turned on and off with the effect. In an attempt to keep the wiring as clean as possible, I decided to install the buffer board inline between the footswitch and the main PCB. If I'm understanding this correctly, in this configuration the buffer is before the circuit and "should" take advantage of the power filtering and polarity protection of the main board.

I have the "In" from the buffer board wired between the "In" pads of the main board and 3PDT board.
I have the "out" from the buffer board wired between the "out" pads of the main board and 3PDT board.
Same goes for the Ground pad.
For 9v power I have the 9v pad on the buffer board wired between the SW pads between the main board and 3PDT board. (I think this might be where some of my problem comes from).

The rest of the 3PDT board is wired as usual.

So the two issues I am having is:
1) The status led is always on. When I turn the effect on it gets brighter but even when the effect is off the led is on.
2) I'm getting an annoying pop when turning the pedal on and off. I found a post where @Big Monk added RPD's to address this but wasn't clear how he added them or where.

I am open to suggestions of a better way to wire this board (or someone to tell me what I did wrong...

View attachment 27166

I'm pretty sure I did this:

On the bottom of the board:

1.) Use a 1/8W RPD connected to the input side of C1 to ground side of R1
2.) Use a 1/8W RPD connected to the input side of C2 to ground side of R2

I needed 2 because my buffer board sat between the Wah bypass switch AND the I/O reversal/"Seagull" switch.

 

[ICTRock]

if I'm reading this correctly you have the buffer and the effect running in parallel

 

[ICTRock]

if you want the buffer before effect ... effect pcb in to buffer out, buffer in to 3PDT in. I would run 9v from the plug to the buffer and ground from the buffer to one of the in/out jacks

 

[MichaelW]

if you want the buffer before effect ... effect pcb in to buffer out, buffer in to 3PDT in. I would run 9v from the plug to the buffer and ground from the buffer to one of the in/out jacks

Thanks! Let me think about how to do that and still keep it neat.

 

[temol]

I decided to install the buffer board inline between the footswitch and the main PCB. If I'm understanding this correctly, in this configuration the buffer is before the circuit and "should" take advantage of the power filtering and polarity protection of the main board.

I have the "In" from the buffer board wired between the "In" pads of the main board and 3PDT board.
I have the "out" from the buffer board wired between the "out" pads of the main board and 3PDT board.

OUT from the buffer board should be connected to the IN on the effect board. You want the buffer in front of the effect, not paralell.

 

[MichaelW]

Thanks guys! One you pointed it out it was so obvious...I feel like "duhhhhh..."
After giving it some thought I decided to put the buffer after the effect and it works perfect now. No pop, and the led goes off with the switch.