Glad you got it working! EBC is the standard pinout, as shown at the left side of your attachment. The clock needs to be buffered for both sourcing and sinking of current because it's the _falling_ edge that triggers the reset comparator through the 10NF cap. You can probably use a complementary buf...

Yes, the reset comparator is not fully discharging the staircase back to 0V as it should. The reset pulse should be about 5ms wide (10NF x 470K); I can't see from your scope trace what the width actually is. Is the clamp diode at the reset comparator's noninverting input going the right way (cathode...

When the circuit is working, there should be a staircase waveform on the 15UF cap. Assuming the clock is roughly 15Vp-p, each positive transition of the clock should pump the staircase up 15V * 1UF/15UF = 1V. When the staircase on the 15UF cap reaches the threshold set by the pot, the comparator fli...

Mouser currently has 40 different 15UF 16V MLCCs in stock, 4 of which are ±10%. MLCCs are inherently low-leakage, but they do suffer capacitance reduction with DC bias, so use the largest package possible and X7R dielectric to minimize this effect. There are also many 15UF tantalum caps available. I...

Yes, the original Clockworks had a built-in power supply and plugged into the wall. You could certainly power it with a 15V wall wart, it probably needs about 200mA.

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 res...

It was recently brought to my attention that the schematic I posted a few years back has an error - the charge pump diodes are backwards. A corrected schematic is attached; I apologize for any inconvenience caused.

Julia

I invented and designed this around 1988. Mike loved it and used to kick out some great jams with it on his piano - it may actually be better suited to keyboards than guitar, since you can have a more stable light source at your keys station. The company name "New Sensor" was inspired by t...

Julia, thanks for taking the time and trouble to dig out and post the schematic. Amongst all the postings on this board this is a fairly unique pedal and circuit, so I feel that we're privileged that you, the designer, have had the generosity and good grace to share the details! Thanks, jaidee. I h...

jaidee wrote:Hi Julia

Thanks for the great post.

I'd still be interested in seeing the original PCB artwork if you can find the time to scan and post it.

Here 'tis - COPPER side.

Julia

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

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

julia

Nicely done! Warms my heart

Awesome, Ben! Good luck and please let me know how it works out. julia Ok thank you, i just never have seen this type of output boost.. Every Day something new to learn :D .. Also Attached a Quick View of the first Version of the Clock-Section Board. First View.png I´m gonna make this Modular so i d...

Yes, the schematic I posted here is correct. For another example of this type of op-amp output booster see Walt Jung's IC Op-Amp Cookbook fig 6-25. It's on page 311 of my 1976 edition... Julia Hi There Guys and Girls, At the moment i´m trying to route a layout for the Clockworks, but came across a l...

Could you use a 10uF there instead and use a smaller trimmer accordingly to still get the 8 steps? 15u 10% is not a common value; mouser have it but otherwise I'd have to stack a 10 and a 4.7. Not the end of the world but if the 10u might work better with the 9V supply it might be worth it. The sta...

Do you think it would run on 9V? Depending on what I can find for drum circuits I might have to use a charge pump already for making a bipolar supply (when synth circuits are written for +-15, I always figure it's not worth converting to virtual ground if that would only leave the circuit with +-4....

You did all that with OPAMPS? :block: Now I can see why you're so proud of it! I assume LM324 would be a good op-amp alternative; this seems like the perfect thing to develop as a three-board setup so you can have 2,4,6... channels depending on what case you can get hold of... Is the op-amp setup d...

...what about those who´ve never listened to one? :D They go to youtube :) https://www.youtube.com/watch?v=hguuj9sZvDk about the only demo about for it... sadly not all that wonderful. It's not something you really listen to though, it's a trigger you'd use with the other EHX Synth/Drum Products fr...

roseblood11 wrote:...what about those who´ve never listened to one?

Um... I've got some stuff on 4-track reel-to-reel but sold my deck years ago, lol.