Spatialist Reverb with momentary switch on dwell; any way to reduce speed of change?

jhalton

jhalton

New member
I have a Spatialist Reverb, and I added the mods with a momentary switch on the dwell pot to max out the dwell. I love the effect, but I find that when the switch is let go, the dwell goes back to the pot setting too quick for my taste. I am wondering if there any way to make the transition from the maxed dwell (momentary switch on), to the regular dwell setting (switch off). If you understand what I am saying...

I don't have much electronics knowledge, so I am unsure if this is even possible. But I figured I'd throw the idea out there....
 
Sorry, I don't have a schematic. Basically, the normally open momentary switch is connected to pins 2 and 3 of the dwell pot (control 1 in the schematic). Based on others who did it, there is also a resistor (i used 390 ohm), mine is between pin 3 and one of the momentary pins. Hope that makes sense...
 

Attachments

  • previewImage.jpg
    previewImage.jpg
    115.4 KB · Views: 11
I will give this a go, but to clarify, when you say 'across', do i connect each lead of the cap to each lead of the resistor? Still learning all this stuff!
 
Should one side of the capacitor go to ground? Like so:
IMG_0611.jpeg

It looks like the Dwell pot/Momentary switch are controlling a 3.3V CV (Control Voltage) going to Pin 20: Analog In.
So the resistor/cap combo would act as a passive LPF, aka Slew Limiter, for that CV…
www.midcentury-modular.com

Triple Slew Limiter — MidCentury Modular

Circuity Slew limiters are based on one of the simplest circuits around: the passive RC low pass filter. At the most basic level, it consists of just one resistor and one capacitor, and it looks like this:
www.midcentury-modular.com www.midcentury-modular.com
 
jhalton said:
I will give this a go, but to clarify, when you say 'across', do i connect each lead of the cap to each lead of the resistor? Still learning all this stuff!
Click to expand...
pricklyrobot said:
Should one side of the capacitor go to ground? Like so:
View attachment 114959

It looks like the Dwell pot/Momentary switch are controlling a 3.3V CV (Control Voltage) going to Pin 20: Analog In.
So the resistor/cap combo would act as a passive LPF, aka Slew Limiter, for that CV…
www.midcentury-modular.com

Triple Slew Limiter — MidCentury Modular

Circuity Slew limiters are based on one of the simplest circuits around: the passive RC low pass filter. At the most basic level, it consists of just one resistor and one capacitor, and it looks like this:
www.midcentury-modular.com www.midcentury-modular.com
Click to expand...
TBH, I'm not entirely sure if it should go to ground or directly across the resistor without testing it. And testing it will not hurt anything - whether it works or not. It's a shot in the dark, but should work in theory, one way or the other.
 
Okay, I have been playing around with this, and I think it is going to work. The transition time is not as long as I like, but I am going to try higher caps. Possibly a dumb question, can I use electrolytic caps (then connect + to resistor and - to ground)? They are the only ones I have at your suggested 10uf.

Also, this is harder than I thought to test! Its difficult to tell how much change there is between caps, as it is reverb, and a wash of sound regardless, plus the natural guitar decay. I need a break, I think I'm hearing things at this point...
 
Last edited:
Or should it be like this?
IMG_0612.jpeg

Because you’re trying to slew limit (slowly ramp) the voltage that is now going to the Pot Path when you open the Momentary Path… 🤔
 
jhalton said:
Okay, I have been playing around with this, and I think it is going to work. The transition time is not as long as I like, but I am going to try higher caps. Possibly a dumb question, can I use electrolytic caps (then connect + to resistor and - to ground)? They are the only ones I have at your suggested 10uf.

Also, this is harder than I thought to test! Its difficult to tell how much change there is between caps, as it is reverb, and a wash of sound regardless, plus the natural guitar decay. I need a break, I think I'm hearing things at this point...
Click to expand...
You an use an electrolytic cap. Just keep the + side pointed towards the more positive voltage direction.
Glad you're trying additional options. (y)
 
You must log in or register to reply here.
Back
Top