Simple Twin-T Kick Drum

yes the order of components is sometime important to work, i see some change on top left ?

So i add Eurorack power connector, LED driver, and safety diodes to the layout, i’m still looking why it’s not working, i can share the .diy file (for DIYLC) to modify the layout if someone want it :slight_smile:

Full size :

And zoom :

I only change the wire for the pot in the top left, did you spot something else ? Also i didn’t know that the order of the components was important, I always believed that as long as they were connected to the right place they were all fine.

not sur but it seems you skip the diode to dist pot

follow the schematic maybe that can help you better to understand the way.

on mine i add a 100k resistor on base transistor for the led indicator and connect it to the Trigger jack in. (yours is connect on pin 10 ?)

Yep, sorry, i drag the cable instead of making it longer my bad, You add an other 100k resistor for the base’s transistor or the one on the jack do the job ? The dist pot go on each side on the diodes (row A and row F); they are connected the same on the pictures and on the layout but on picture part B it’s hard to see both yellow cable.


red wire with 100k go to the pin of Trigger jack socket (not on the 100k :slight_smile: )

Hey @Dud omelette du fromage !
Je suis a peu prĂ©s sure que ça ne change rien pour les diodes et le potar de disto, ils sont en parallĂšles avec le - et le out de l’op-Amp, j’ai quand mĂȘme fait le chagement ça me met le doute.
Aussi pour le transistor, tu a remit un cable avec une resistance de 100k ? J’ai pas encore monter le driver, mais vue qu’il y Ă  dĂ©ja une resistance de 100k sur le jack je pense qu’on peut monter le driver en parallĂšle aussi, le cable gris que tu a rayĂ© Ă©tait censĂ© allez devant le cable vert 2 case plus haut, j’ai Ă©diter la photo un peu plus haut.

Je suis en train de refaire tous le shéma de mon montage pour comparer avec ceului de @Krakenpine

PS: Pourrez tu me partager le fichier DIYLC de ton circuit que je compare les connexions avec le mien s’il te plais ?

In english :
I’m pretty sure it doesn’t change anything for the diodes and the disto pot, they are in parallel with the - and the op-Amp out, I made the change anyway, it makes me doubt it.
Also for the transistor, did you put back a 100k resistor cable? I haven’t mounted the driver yet, but since there’s already a 100k resistor on the jack I think it’s possible to mount the driver in parallel too, the grey cable you scratched was supposed to go in front of the green cable 2 holes up, I edited the layout’s picture.

I’m redoing all the schematics of my setup to compare with this one from @Krakenpine

PS: Could you share the DIYLC file of your circuit with me and let me compare the connections with mine, please?

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no, one is for sound out and another for signal led

yes i do that soon :wink:

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et hop !
here :wink:

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Thank you :slight_smile:

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Why does it come with 2x100nF in parallel between pin4/11 and GND?
One nearby the 10uF electrolytic and one nearby the TL074

it’s some bypass cap, it’s better to put on each IC + & -

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But the ones near the electrolytics are redundant.

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That’s what I meant. The result is higher capacity. If this is intended, then why?

Physical placement matters, technically they add to 200 nF but only 100 nF is near the IC pin where it’ll do the most good. See:

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Tone (freq) and dist are mislabelled or have the incorrect resistors attached to them?

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@Plop have you try it with this changes ?

thx for info, you will surely see it again in another layout that I have already posted :grinning:
I will correct that.

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For the dist pot i mooved it like you say, and indeed i made a mistake and use 100k insead of 100 ohm for the tone pot, but for the decay and tune i mislabelled them.
I’m waiting for my iron the get hot !

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or test it on breadboard before ? (if you have it :wink: )