Hi!
I bought a sound effects DIY kit. But would like som help with a modification. There are three switches with four modes on each. The one to the right in the prebuilt kit by the seller has a potentiomer allowing to adjust the pitch instead of just four positions.

I asked before I bought the kit if they were the same and he told me so. Now he dont answer more about that question. Is it difficult to change (or just add, would be better, a potentimeter to the circuit) the one switch to the right with a potentiometer and how do I do it?
Appreciate all help a lot!

Here is some pics and links
DIY kit
https://www.rdhelectronics.fr/site/EN/cat-1/prod-63

Pre built with potentiometer to the right
https://www.rdhelectronics.fr/site/EN/cat-2/prod-47

Images on parts




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Please post a circuit diagram.

 

Dont have it but it should be same like this.

 

From that diagram pith A & B switches select resistors between 47k and 470k so you could replace them with a double gang 470k pot with a 47k resistor in series with each. The added 47k is important to avoid destruction of the transistor.

 

From that diagram pith A & B switches select resistors between 47k and 470k so you could replace them with a double gang 470k pot with a 47k resistor in series with each. The added 47k is important to avoid destruction of the transistor.

Thanks Albert!
I dont have any 470k in my circuit so maybe it was not a good idea to trust that circuit diagram to be the same. (Behavior should be same)

 

Hi!
I bought a sound effects DIY kit. But would like som help with a modification. There are three switches with four modes on each. The one to the right in the prebuilt kit by the seller has a potentiomer allowing to adjust the pitch instead of just four positions.

I asked before I bought the kit if they were the same and he told me so. Now he dont answer more about that question. Is it difficult to change (or just add, would be better, a potentimeter to the circuit) the one switch to the right with a potentiometer and how do I do it?
Appreciate all help a lot!

Here is some pics and links
DIY kit
https://www.rdhelectronics.fr/site/EN/cat-1/prod-63

Pre built with potentiometer to the right
https://www.rdhelectronics.fr/site/EN/cat-2/prod-47

Images on parts




[/url

Replacing the switches with pots I get the following. I think there are errors in the NJD Clone schematic. The line closest to the text "NJSD Clone" seems irregular. Can somebody look at this and see if it works. I don't have the rotary switches to build it.