EHX - (Super) Space Drum (Percussion Effect)  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
Ruprecht
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Post by Ruprecht »

My Super Space Drum clone with in-built delay



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JuliaDee
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my favorite amplifier: 2N5088
Completed builds: Invented and designed: EH-8000 Guitar Synth, E-H Space Drum, Super Space Drum, Crash Pad, Sequencer Drum, Clockworks. Designed: Zildjian Gen-16 Acoustic-Electric Cymbal System.
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Post by JuliaDee »

Nicely done! Warms my heart :)

Ruprecht
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Post by Ruprecht »

Thanks :)
I´m fan of analog drum synths :)

My Synare 3 and Coron DS-8 clones
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And Synare 3 "UFO" clone :) Built by me from scratch :)
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JuliaDee
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my favorite amplifier: 2N5088
Completed builds: Invented and designed: EH-8000 Guitar Synth, E-H Space Drum, Super Space Drum, Crash Pad, Sequencer Drum, Clockworks. Designed: Zildjian Gen-16 Acoustic-Electric Cymbal System.
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Post by JuliaDee »

Those panels are just amazing. How are they fabricated? Do you do it yourself or have them made?

julia

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Post by SpencerPedals »

That's killer. I've had no time to build lately, but when I get a chance this is on my to-do list. Looks and sounds amazing—congrats!

Ruprecht
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Post by Ruprecht »

I made myself small CNC milling cutter some years ago so all this is my work :)
Sheet of tin is engraved first and then bended. Wood side panels are simply milled.

JuliaDee
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my favorite amplifier: 2N5088
Completed builds: Invented and designed: EH-8000 Guitar Synth, E-H Space Drum, Super Space Drum, Crash Pad, Sequencer Drum, Clockworks. Designed: Zildjian Gen-16 Acoustic-Electric Cymbal System.
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Post by JuliaDee »

Ruprecht wrote:I made myself small CNC milling cutter some years ago so all this is my work :)
Sheet of tin is engraved first and then bended. Wood side panels are simply milled.
Beautiful. Nicest DIY work I've ever seen. Kudos to you!

julia

P.S. There's a Clockworks just came up on ebay - $1,100 :shock:

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apollomusicservice
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Post by apollomusicservice »

Very nice.

satanicmajesties
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Post by satanicmajesties »

Hello,
I'm interested in making one for fun!
Where can I find Xtal mic or can I put another thing in order to replace the xtal?
Thanks

uncleboko
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Post by uncleboko »

satanicmajesties wrote:Hello,
I'm interested in making one for fun!
Where can I find Xtal mic or can I put another thing in order to replace the xtal?
Thanks
https://www.ebay.co.uk/p/20-Pcs-Electre ... 7675.l2644

These should do the trick, you may need to play with the peak follower gain.

satanicmajesties
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Post by satanicmajesties »

Thanks for your reply.
What is peak follower gain?
Is there a component to add, change or change value?

JuliaDee
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my favorite amplifier: 2N5088
Completed builds: Invented and designed: EH-8000 Guitar Synth, E-H Space Drum, Super Space Drum, Crash Pad, Sequencer Drum, Clockworks. Designed: Zildjian Gen-16 Acoustic-Electric Cymbal System.
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Post by JuliaDee »

Crystal mic basically = piezo disk. Back in 1978 we did not have piezo disks :) I would not recommend an electret mic - they are fragile and they need a power supply. Depending on how the piezo is mounted and how hard you hit it, you might want some kind of high-voltage protection to protect the rest of the circuit (Yamaha actually puts spark gaps on their PCBs for this!). But if you just stick it to a hard flat surface as in the original Space Drums, it probably won't be necessary. Voltage generated is proportional to how much the disk flexes.

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Post by uncleboko »

Ah yes of course I forgot about the power requirement!

satanicmajesties
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Post by satanicmajesties »

The missing value of resistor R16 is 330, according to original schematic.
Thanks to Julia

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Post by uncleboko »

uncleboko wrote:Ah yes of course I forgot about the power requirement!

I'm used to plugging a pair of electret capsules into my digital recorder, which has plug in power, when recording a gig.

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