JHS Synth Drive Mod

[vigilante397]

If anyone still cares  i made a improved  switch wiring guide. 99% sure is correct.

I still care, thanks! And welcome to the forum

[SprinkleSpraycan]

Did this mod yesterday. It is the absolute best thing ever. Thanks to everyone for the information.
https://www.instagram.com/p/CYADlRHv7b1/?utm_medium=copy_link

[vigilante397]

Did this mod yesterday. It is the absolute best thing ever. Thanks to everyone for the information.
https://www.instagram.com/p/CYADlRHv7b1/?utm_medium=copy_link

Looks great! 

[Derekjesse321]

C1- .1u
C2- 1uF (NP)
C3- .047u
C5- .1u
C8- 1uF (NP)
C11- .047u
C13- .1u
C14- 1uF (NP)

R35-1.1k metal film

D4-1N4001

Does changing these components have a huge effect on the outcome of the mod or can I just hook up the switches and wires?

[SprinkleSpraycan]

It definitely changes the quality of the distortion. Gives a deeper and coarser quality to it. I'm pretty sure it helps give the synth tones from the switches their deeper quality.

[soggybag]

Glad this topic popped up! I have a DS-1 on my bench at the moment. I was applying the Keely Mods. I think I'll give the JHS mods a try also.

Not sure if this is helpful to anyone here but, I rehoused some other circuits into some Boss DS-1 enclosures. This left me with three left over DS-1 PCBs. These happen to fit those 125B enclosures perfectly.

Here is a link to a blog post with some pictures showing the process.

http://www.super-freq.com/rehousing-the-boss-ds-1/

Here are a couple pictures. The footprint of the DS-1 PCB fits almost perfectly. You need to file the notches in upper corner a bit.

[vigilante397]

Does changing these components have a huge effect on the outcome of the mod or can I just hook up the switches and wires?

You can hook up the switches and wires, but I would recommend swapping these components. I've done a couple mods for people where I just swapped the components and didn't add the switches, it makes the DS-1 a much better sounding pedal.

[rousejeremy]

I heard this idea originally came from Brian Wampler. JHS sticking their name on it doesn't surprise me in the slightest.

Does anyone have the original Wampler Synth Mod?

[iainpunk]

IIRC the Wampler mod uses diodes to do a crude octave up, and when they are done together, the thing only oscillates and fully ignores the input signal.

cheers

[Derekjesse321]

My ds-1 seems to be a later model with smd components. Can I still do the mod?

[vigilante397]

My ds-1 seems to be a later model with smd components. Can I still do the mod?

That's a solid question, I've never seen one with SMD components. What does it look like inside? I wonder if the designators match up with the original or if they completely changed it.