bleak CV to EXP

passive analog voltage method convertor

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'///. DESCRIPTION '///////////////////////////////.

this is a new little original design that i've been testing for a while. it will allow you to take a control voltage signal, like an LFO or analog sequencer, and feed it into a "proper" expression pedal input. it also gives you two controls, an offset and a depth. it includes over voltage protection that works with the destination device's power supply to keep things nice and safe and if you do not plug anything into the "input" then you can use it like you would one side of the dual EXP with the offset becoming the expression control and the depth still acting as a depth control, BUT there are situations out of my control where using this device could possibly cause damage so please read the warning below. the input cable can be TS or TRS but the output cable MUST BE TRS to allow it to do its job.

WARNING ::: without over explaining ... there are some devices out there that do not use the expression pedal pot as a voltage divider, they instead just use two pins of it as a rheostat and for those devices, which are usually handmade or very old, the CV to EXP will NEVER WORK AND MAY SIMPLY DESTROY THEM. the only way to know for sure if a device you intend to use this with uses the pot in an expression pedal as a voltage divider is to ask the designer, consult the schematic, or send me the schematic and i'll let you know ( but i will not look for schematics for you, i don't have the time ), usually if the seller/ designer talks about the pot's resistance value that is a bad sign. the percentage is very very small but there are enough devices out there that don't have "real" expression pedal inputs that you really need to be safe about this.

I AM NOT RESPONSIBLE FOR ANY DAMAGES DONE TO ANY OTHER EQUIPMENT FOR ANY REASON WHAT SO EVER. USE YOUR BRAIN AND DO THE RESEARCH OR YOU WILL REGRET IT.

also in regards to the Over Voltage Protection. well there is always the chance that someone out there will use the full voltage of a modular synth ( at most about +/-15v typical ) output and feed that into a little unassuming pedal ( +/-4.5v typical ). you should be fine because of the O.V.P. of course but there are always going to be component failures and random other situations out there in the world that i can never account for or predict, so doing something like this is sort of asking for trouble. my suggestion is simple, USE THE DEPTH POT. that is what its there for, what it does is control the amount of voltage that passes through it, makes sense right?. when i use it personally i typically turn the depth all the way down [ far left ] then i center the offset, then make my connections and slowly start increasing the depth control until i hear the peaks of the LFO reach it’s highest point in regard to the destination device. usually this means that the highest points will start to "drop out" or result in no effect or even silence. that point is usually the “max” voltage that the destination device will accept. the over voltage protection i have in these, which is good up to about 100v, "should " keep any damage from happening but once again i can't possibly know everything about every device in existence and how it was designed so i'll say again I AM NOT RESPONSIBLE FOR ANY DAMAGES DONE TO ANY OTHER EQUIPMENT FOR ANY REASON WHAT SO EVER. USE YOUR BRAIN AND DO THE RESEARCH OR YOU WILL REGRET IT. but as long as you keep everything under control and resist the urge to pound CV into a sad little unassuming pedal you should be fine. the design has been field tested and has received expected results. i would never sell this if it was not as "idiot proof" as i can get it

and no there are no vactrols used in this design

 '///. CONTROLS '///////////////////////////////.

offset :  the left knob lets you adjust the center point of the control voltage you are using

depth:   the right knob is a overall depth control for the CV

i/o jacks:  the left jack, marked with the arrow pointing into the box, is the input. the right is the output. you must use a TRS cable between the output jack and the expression input on the other device

 '///. DETAILS '///////////////////////////////.