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? Volt per octave keyboard ?

I appreciate your help on everything grumble. You are way more knowledgable at this than I am. You have saved me a lot of time more than once.

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basic volt per octave keyboard schematics

Good idea!

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Power Supply?

Ive found this http://imgur.com/7GoweSG and this http://imgur.com/KDKUCXB What is the difference. How should I go about making power supplys for my projects. the smaller the better in most cases. Ive...

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ADSR by nicolas3141 - fonik redraw scheme

hi i have build this adsr and i think have problems with the Release Pot ! if all pots off and i turn the Release Pot a little bit on the ENVY go on even though no Note is play Thanks StormB

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basic volt per octave keyboard schematics

Thanks. I will go with the (small jumps till the bounce starts to show up ) and see what happens. Thanks for your time on this. would be nice to post minor mods that might make it a little more useful....

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Power Supply?

Can I safely use the same value electros in place of the tantulum? for the large ones Could I go for lower value caps i.e. smaller caps(or even lower rating 25v?) for the 4700uf or 3300 in the smaller...

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basic volt per octave keyboard schematics

Figured I would go ahead and post Grumbles volt per octave circuit with the gate comparator.I used 741 op-amps and it worked well.

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ADSR by nicolas3141 - fonik redraw scheme

hi i have found my mistake pin 8 from the socket was bent, and the diode D2 goes to pin 2 off the Sustian Pot not to pin 3 how look on the first Layout and schematic

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Hexinverter´s Battery Acid layout

any ideas? Sounds like the levels over the diodes are not high enough to get them conducting (and then distorting the signal). Some causes could be :- too low an input level.- not enough amplification...

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weird synth box that uses lots of 10K pots

Hi.I have a bunch (16) of 10K pots from an old project. I want to reuse them and make a weird noise synth box (like an APC) perhaps with CV in and a simple step sequencer.Any recommendations on...

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Hexinverter´s Battery Acid layout

what are you using as your sound source ?as Blue Hell mentioned if the level is too low it won't clip, but with the amplification being adjustable to >200xand the voltage drop over the diodes being...

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808 Cowbell Eagle Layout

I restarted this from scratch and now it works. One-sided Eurorack format PCB with tunable components VERIFIED.Eagle files: https://github.com/jbeuckm/808_CB/releases/tag/v0.1

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808 Mid Tom in one-sided Euro format

Verified working. Needs separate pink noise source. Should work for LowTom / HiTom values too. Designed for this chunky 4PDT toggle:...

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808 Mid Tom in one-sided Euro format

Chunky indeed, looks great, Joe!

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EFM VCF 4622 Moog Taurus type Transistor Ladder

Ah, yes, I posted it earlier. I have changed some things, added trimmers for self resonance (based on frequency centrals raging bull).I'll upload the latest version tonight.Regarding the ground plane,...

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Hexinverter´s Battery Acid layout

Here are a couple of pics. First one straight from the sine output of the 555 vcoSecond one is with all pots cw. Input and output pots adjust level as expected. Distortion switch and pot do nothing ,...

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Buchla 194 Stripboard

I layed out a board for this as well, and also built a module out of it, but yeah, not enough feature density. Meaning to redo this with VCA's after each band or so to give it a bit more versatility....

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808 Handclap (almost there)

Oh that's easy - use the other half of your 13700 to CV the reverb level ;)

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Buchla 194 Stripboard

An interesting idea!

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basic volt per octave keyboard schematics

As with the first schematic on this page, I had an improvement in temperature stability with Grumbles circuit when using OP177 opampsThese things are impresive. I finally had the heat gun out trying to...

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