oran.outan
Well-known member
Hi all
Not really a studio project, more about an sound installation project and an experimental instrumental/electronic design...
I made an assembly with a microcontroller and a digital potentiometer MCP42xxx.
I can send messages to the microcontroller for control the resistors levels of the digit Pot connect to a custom 'amplifier board', basically a circuit based around a 10w audio amplifier TDA2003... which changes the level of a magnetic microphone (guitar pick-up) send to speakers.
The pick-up level change (the sound on speakers moving up/down)… but I can ear a 'small audio click noise' when I change the level/Value of the pot, at each step of the pot. If I don’t change/send a value to the pot, sound is clear and I haven’t any noise, but while I change the pot level ‘click noise’ appear. So, it’s clearly coming from there !
I understand that the digi Pot resistance is 'jumping', step by step and is not continuous/linear (which is sad) like a rotary pot, causing 'cuts' in the signal.
Could a small capacitor for smooth the resistor jump can help !?
My ability on audio design are pretty poor, any help is welcome.
here is the TDA circuit, I just replace the 50k rotary pot by the digi Pot...
thanks and best
0-0
Not really a studio project, more about an sound installation project and an experimental instrumental/electronic design...
I made an assembly with a microcontroller and a digital potentiometer MCP42xxx.
I can send messages to the microcontroller for control the resistors levels of the digit Pot connect to a custom 'amplifier board', basically a circuit based around a 10w audio amplifier TDA2003... which changes the level of a magnetic microphone (guitar pick-up) send to speakers.
The pick-up level change (the sound on speakers moving up/down)… but I can ear a 'small audio click noise' when I change the level/Value of the pot, at each step of the pot. If I don’t change/send a value to the pot, sound is clear and I haven’t any noise, but while I change the pot level ‘click noise’ appear. So, it’s clearly coming from there !
I understand that the digi Pot resistance is 'jumping', step by step and is not continuous/linear (which is sad) like a rotary pot, causing 'cuts' in the signal.
Could a small capacitor for smooth the resistor jump can help !?
My ability on audio design are pretty poor, any help is welcome.
here is the TDA circuit, I just replace the 50k rotary pot by the digi Pot...
thanks and best
0-0