Does this snare/hihat schematic look okay?

[Meehah]

Hello.

I'm not sure if this is the correct board for this but it looked to be the best choice.

I have found a schematic for a snare and hihat but would like to make sure it is okay before I build. I don't know all that much about electronics and so was wondering if someone would be able to take a quick glance over it to make sure it looks like it will work? Here is the schematic:


Thank you very much.

[gabbagabi]

hi and to this forum,

the schematic "looks" ok,

the noise source is very similar to the nutsNvolts noise source here:
https://www.nutsvolts.com/magazine/article/bipolar_transistor_cookbook_part_5

in the VCA are small changes, the original vca u will find here:
http://www.sdiy.org/richardc64/new_drums/dr110/dr110a1.html

the envelope will work somehow, the 10µF Caps are a kind of big but not a real problem,
the other thing is: the Amplitude of the envelope is dependent of the amplitude of your Trigger-Signal, which could be a problem cos it couldt be easy to loud or to quiet, and it is nothing written there about the trigger amplitude - so u have to try urself - of course on the breadboard first

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[Meehah]

Thank you very much. I might build it tomorrow and if I do I will post about how it goes.

[PHOBoS]

The circuit looked familiar so I looked around a bit and found an older thread about it here.
Also the designer is known as Top Top here on the forum.

[Meehah]

Thank you very much PHOBoS. I’ll have to read that thread.

I just finished it off and it works great. I built exactly as per the schematic but used 1n914s instead of 1n4001s and 4.7uF instead of 10uF as that’s what I had. I built it with the snare capacitor values but will do a hi hat tomorrow. I won’t upload any audio clips as theirs a good demo here: https://youtu.be/B8t38IFALTo. It sounds quite good, though very lo-fi and gritty, what I expected. I’m very pleased with how this turned out and would absolutely recommend it as a first foray into synth drums.

Thank you g-gabba for checking over the circuit, it gave me much more confidence in building it and the links you gave where very interesting and helpful as well.

[gabbagabi]

glad to hear u have entered the sdiy world with a pleasend success

some more drum ciruits u could find here:
http://electro-music.com/forum/phpbb-files/buch_scan_rythm_129.pdf
from this thread:
http://electro-music.com/forum/topic-28541.html&postorder=asc&highlight=twint&start=25

regarding component values, most of the times the circuits will work with values different from the schematic, the outcome often differs only minimal.
e.g last schemo (Bass Drum) in the pdf, the 18nF caps in the bass drum schemo could be replaced by 22nF or two 10nF in paralel (=20nF), insted of 39k resistor u could try 33k or 50k, for the 68K resistor u coul try 50k or 100k, for 27k u could try 22k or two 50k in paralel and so on.

glhf

[steved]

I just built a few of those based on that schematic..
It works great for me. I run it from 12v with no problems.

combine the snare with PAiA syndrum and it sounds great
https://www.paia.com/ProdArticles/syndrum.htm

good luck, lmk if you want my pcb layout for that circuit

[Meehah]

I finished the hi hat today. I had some issues with constant white noise even when not triggered that I eventually fixed by replacing some capacitors that I believe were at fault. It sounds good as well, I would say better than the snare. Thanks again for the help.