Pitch Bend Drum Voice with LFO on the Frequency

[Ruebezahl]

I recently found a Video showing a Drumsynth, wich idea i quite liked:

https://www.youtube.com/watch?v=l7Ln2oic_ds

However, there is no schematic, and its hard to obtain more information about this particular desgin. Apparently its by someone from Japan. Does anyone has more information about this or maybe other desgins wich are similar to that one. Especially the pitchbend and an LFo modulating the pitch. I'd like to implement one of this kind in my modular Drum Machine i am building right now. So it would be nice to have some schematics or something with a PCB or Stripboardlayout. Thanks upfront!

[PHOBoS]

ah denha I used to follow his vids, kinda miss looking at his wonderful marblemachines. Anyway it sounds very similar to an older
circuit he made,. the XR-NOISE box: https://www.youtube.com/watch?v=3l5DOGn_rFw (build around an XR2206)
most likely a piezo disk as a trigger for an envelope generator which modulates a VCO. You could probably ask him he
seems like a really nice guy.

[Ruebezahl]

Oh, i see, i didnt know the XR-Noise Box yet. It actually can do even more than the Synth-Drum mini. Well i found out his Email now and asked him. Though the youtube comments are full of requests for schematics and no answer so i dont know if i can hope for much We'll see, i will keep this thread updated.

[StephenGiles]

http://www.freestompboxes.org/viewtopic.php?f=1&t=11251

EH Super Space Drum circuits are here, which will do everything on that video. It uses a CA3094 OTA which is no longer available, so somebody reworked the circuit for LM13600

https://www.dropbox.com/s/mfkb8roi281s2ty/Spacedrum%2013600.png?dl=0

[ickystay]

It seems to be the drum synth from an old japanese book of electronic projects.

http://www.experimentalistsanonymous.com/diy/forums.html?dir=Schematics/OOP%20Japanese%20Electronics%20Book

scroll down to "drum-synth-"

There's even a pcb.

It's been a long time since I messed with a Boss PC-2, but I think it had a very similar sound.

[Ruebezahl]

Thanks a lot. The Japanese one looks good, especially because there is a PCB-Layout. The Super Space Drum is nice aswell, since its using a 13600 instead, but there is no layout (or is there? i didnt see one). For the CA3080 i will use on half of a 13700, stuck to a small piece of perfboard, a trick i did with the synbal aswell. I keep you all updated!

Can somebody tell me what purpose the red part on the schematic of the drum synth has? Also i wonder the circuit splits the 8V into 4V twice? Once its right after the 7558 and another time its in connection with the LM324, in the middle of the schematic.