40106 problem

Deedalo12 · Joined: Oct 28, 2021 Posts: 9 Location: Buenos Aires

Hi! me again, a noob. I having a problem with the 40106 on thhe protoboard... im using a 5v cell phone charger for supply, im using a 1uf capacitor and a 100k potentiometer to do 1 square wave but most of the trajectory of the pote nothing sound and suddenly in a very short trajectory it goes from a low pitch to a high pitch.

What values should i use to get some LFO, and VCO?? the 9v battery are expensive for me now. Maybe the power supply is bad, i have a guitar pedalboard supply maybe that works better but i dont know

blue hell · Posted: Wed Oct 09, 2024 5:19 pm Post subject:

Seems erratic then .. did you connect unused inputs to ground -- also the inputs on ports not being used ... so .. five of them.

For values, just experiment Cool

[the thing is pretty sturdy for electrical experiments - they can be damaged by static electricity though .. which might also make them act weird]

Deedalo12 · Joined: Oct 28, 2021 Posts: 9 Location: Buenos Aires

Hi! i didnt conect the unusued inputs, maybe that broken the ic?? now i do it but, i put a led on the out of the gate, but when i move the pote the led change his intensity, so i think the inverter its not oscilating Sad

. Maybe i broke it

blue hell · Posted: Sat Oct 12, 2024 12:10 pm Post subject:

You can not easily see on the LED if it oscillates .. in fact .. it actually may .. where the pulse width varies a bit with the pot setting .. I think that would happen, and you might just be seeing that. [varying pulsewidth results in varying average ouput voltage, which may result in the LED dimming / brightening a bit].

And this depends a bit on the oscillation frequency - very slow oscillations you would see .. say below 25Hz or so.

For audio checkeing you'll need to listen .. or view with an oscilloscope.

And probably it is not broken .. which also depends a bit as it can be - but - umconnected inputs will not automatically destroy it; what can happen is that static electricity (touching the device while statically charged) kills it - again though - it may - it not always will.

But eh not withstanding the warnings in the data sheets .. they can handle a little bit of mistreatment Smile

Oh and you dit put a resistor in series with that LED I hope? Again, it would not destry the device, but it would limit the output voltage swing .. and it is a 'bad habbit' Smile

Anyways - do not give up yet - and good luck Cool

Deedalo12 · Joined: Oct 28, 2021 Posts: 9 Location: Buenos Aires

IM confuse jajajaj (im not english speaker) now i put all the inputs to ground. But i get the same problems with the pote. Its any form to upload pictures on the foro ?? maybe that can help me to explain.

Some days ago i got a beatiful LFO but idk what happen and i cant get a good oscilation anymore Crying or Very sad

Again thank you for your time !

blue hell · Posted: Sat Oct 12, 2024 1:50 pm Post subject:

Deedalo12 · Joined: Oct 28, 2021 Posts: 9 Location: Buenos Aires

great, this is my project XD

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blue hell · Posted: Mon Oct 14, 2024 5:28 pm Post subject:

PHOBoS · Posted: Thu Oct 17, 2024 12:08 pm Post subject:

On the photo it looks like the first 2 gates have their outputs connected to ground instead of their inputs,. but that could just be a matter of perspective.
does the chip get warm ?

Also it looks like you are taking the output signal from the input of the inverter (the side with the capacitor). This can sometimes work but could also
prevent it from oscillating.

have you tried putting it on a different spot on the breadboard ?
sometimes the connection isn't good enough, taking the chip out and putting it back in could fix it.