Kill dry switch for Caesar

[ttf]

Hey folks, I'm working on modding a Caesar to have a remote kill dry switch so I can flip between chorus and full vibrato using a switcher, i.e. as if the switcher turns the knob full clockwise to 100% vibrato.

So far, I've been able to get close to that result by tying pins 2 and 3 of the blend pot into a TS jack (see screenshot) and I am able to kill the dry sound and get a vibrato sound when T and S short, but I notice there is a big volume drop. A lot fainter than when the blend knob is turned full CW.



I guess there's more to shorting pins 2 and 3 to recreate a fully-clockwise blend knob. Has anyone done anything similar and what am I missing? Thanks in advance!

 

[Guardians of the analog]

What about two blend pots on a 3pdt? Then you can toggle between different settings and fine tune the depth.

 

[ttf]

What about two blend pots on a 3pdt? Then you can toggle between different settings and fine tune the depth.

Thanks for your reply @Guardians of the analog, this is is a great idea but I need it to be switchable by shorting tip and sleeve (from a Boss ES-5 CTL 1 output). I suppose it's possible to use relays to achieve this.

 

[neiltheseal]

Are you asking for help on how to do this?

If so, put r34 on a switch so one end is connected to pin 3 of blend and the other end of the switch is not connected to anything.

 

[ttf]

Are you asking for help on how to do this?

If so, put r34 on a switch so one end is connected to pin 3 of blend and the other end of the switch is not connected to anything.

Thanks @neiltheseal so basically take out the dry signal by lifting the leg of R34. Won't I have to do anything else on the wet signal side of the pot?

 

[neiltheseal]

Hello. Sorry I missed this. Whether you do anything to the wet side of the pot depends on what you want. I assume that the pot would work as normal, but instead of mixing between 2 signals, just reducing the level of the wet.

Do you want the wet to be on full when you use the switch?

 

[neiltheseal]

If so I think you would just disconnect pin 1 of the blend pot. So use a dpdt switch and on a different row have one setting connect pin 1 with r35 and r37 (as it is currently) and the other end of the switch disconnect pin 1 so just r35 and r37 are connected.

The second setting above would be the vibrato setting where r34 is disconnected.

 

[ttf]

@neiltheseal thank you for your reply, I was able to get it to work with some advice from a friend along with inputs from this thread and others. Basically:

Pin 3 of DCV = lug 1 of DPDT ON/ON
Pin 2 of DCV = lug 2
Pin 1 of DCV = lug 5 and has been isolated from the R35/R37 node
R35/R37 node = lug 6
Lugs 5 and 6 are tied to a 10k resistor

Sorry for the bad diagram lol

Being completely honest, I am still not 100% how this worked (still a new learner) but I'm glad it did. The results are what I was hoping for - when the remote switch is in closed position, I get a full vibrato sound with no volume drop. Switch open and it's back to where the DCV knob was.

The bigger idea is to build myself a Caesar with a digital brain, kinda like a mono Julianna. I used a TapLFO3D to replace the LFO section, opening up some additional features. I've incorporated into the build a TRS remote jack that does the following:

• Tip - tap tempo signal from Boss ES5 CTL1 - this allows me to set up different chorus patches with different tempos from within the ES5.
• Ring - kill dry switch (this mod) - this allows me to essentially have chorus and vibrato patches using the ES5.

Common use case would be like, so I have a 162bpm quarter note song on vibrato only, and with a patch change on the ES5, I can quickly be on a 212bpm dotted eight with chorus. All with the Caesar. Ended up having to use a large enclosure, but worth it since it is replacing two full-sized pedals from my board. I hope to do a proper post and demo about the build some time soon.

Thanks for everyone's inputs!