i am currently working on a project i started in my free time. i am trying to construct a drum machine , which is going better than expected. something which is giving me nightmares is the ammount of noise i am getting when the device is started


This can be noted int he first seconds of this video

any suggestions on how i can pull down this noise is highly appreciated.


I was noting that a 555 timer working on the same power supply can be clearly heard in the noise.



also this video shows a partial of the circuit from above since the other video does not show much.

i know you are going to ask for schematics , but these are unfortunately not available since the breadboard is ongoing various impromptu changes.


This circuit is of my design , and it is much simpler than it looks.

 

Do you have power supply decoupling?

 

Hello,

Do you have decoupling capacitors in your circuit?
Have a look at this thread why they are needed:
Decoupling or Bypass Capacitors, Why?

Bertus

 

since there are several timers on the same power rail , does that mean that i have to add capacitance to my voltage rails as a whole? i am actually blaiming the cheap chinese mb102 power supply i am using

 

Hello,

Each NE555 will need to be decoupled by an 1-10 μF tantalium and a 0.1 μF ceramic capacitor.

Bertus

 

that'll have to wait till this weekend then gotta get some tantalums hah . how about paper?

 

didnt really work with paper caps just tried it with 1 uf and 0.47 uf in parallel. had no difference on the noise