#2001 keyboard sequencer

I don’t think so, that’s a through hole part, meant to give you header pins that run parallel to the board. The SMD one has mounting pins that sit directly on the board leaving the header pins perpendicular. The Tayda one won’t do that.

(By the way, the matching socket is described as “10 Pin low profile SMT header Female” but the link is to a through hole part. I suspect through hole is correct for that one.)

ahh i can see the smt pads for it now on the front panel and some tht on the main pcb. its to join the PCB/Panel for the Touch pads. Not enough room for a nor mall pin headder.

That is what I was afraid of Rich.

Twinturbo, Can you post a pic of that?

the pins on the SMT male are offset at alternate angles, not all pointing the same way. You could pull them out of a standard header and pu tthem back in… But I think the overall space between boards is the constraining issue.

Maybe I will just run wires

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found it



Even got it in Mouser!


-Fumu / Esopus

Hello All

Currently building the Keyboard sequencer and have run into a few issues.

the main issue at the moment is the the merge mode. Rows 1 + 2 work perfectly independently but when moved to the merge output the second row sounds like its winding down. We’ve also noticed that the led that shows when the second row is being used is notably dimmer that the one above. We have check that part of the circuit and replaced the 4066 chip but with no change.

Does anyone have any ideas, I have attached a video that should depict the issue


Hey @lookmumnocomputer 2001 Sequencer BOM says Qty 1 for SPDT SWITCH (ON)-OFF-(ON), but there is 2 … (SW10,SW11)


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hey @Joeroeb very sorry I missed your comment. let me look at me notes, it happened to me on a previous version, I swapped the 4066 and it worked. which 4066 are you using potentially there is a gate threshold im not taking into account regarding the type of 4066 to use. im using CD4066BE which is probably the most common to get hold of which are you using? ill keep thinking also. the 2 4066’s you used definitely working right?

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thanks @Riggidyboo its now fixed

Right ok bit of a modification, I will add this to the website as I think its worth for everyone to do so.
Swap R58 (its the resistor right in the middle of D41,D40,D36,D35.) swap that with a 1k resistor. Your 4066 is not getting enough gate voltage to trigger it over fully.


also I should add thats a cool effect hahahaha, maybe make a switch between 10k and 1k for some Spectrum Style Drops hah

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Absolutely, even though it wasn’t working quite as id hoped i was impressed with the noises it was making,

Thanks for the Suggestions i will give them a go


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@lookmumnocomputer Cheers for that suggestion it worked beautifully,

Another issue we’re having is one rather like the problem you had on one of the prototypes on your patreon where the leds were flashing when you had you finger held on a key whilst the clock was running through it.

Any suggestions for this?

Many thanks

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For anyone curious about the female low profile header, here it is next to a normal one.

Male one is on back order.


also! it goes saying normal size does work however it bulges it all a little bit, low profile keeps it all flush!

thats the code! will be sorted in next few days im just working through it :slight_smile:

Looks like the non SMD right angle headers I bought work fine.

Pop out every other pin and reinsert in alternating directions, then cut the bottom length in half. For the standard female header, a quick bit of sanding removes the extra height.


Oh, I’m too late, it’s out of stock. Will it be available again @lookmumnocomputer ?