Chauffeur Overdrive Volume MOD

[danwojaz]

Hey Everyone,

I heard a few months ago that the chauffeur was updated to have more volume. I have been trying to figure out the best way to do this.

Would changing R17 to a lower value, or change the value of R18 be a good place to start.

 

[Feral Feline]

I'd go with increasing the value of R18.
R17 is already a fairly low value — but I have no real understanding of why it is the value it is.


Run R18 into a trimmer or a pot to make it adjustable and fine tune it to where you like and then measure the trimmer/pot resistance and install the closest resistor value to the sum of R18 and the VR — or you could even just leave the trimmer/pot in and have the ability to change it as/when your needs change.


Mind, the circuit-snippet you posted matches the current build doc, but ... the ref-des of the PCB-pic in the shop doesn't match up with the schematic. All the components surrounding IC5 for instance...



In the posted schematic-snippet and build-doc schematic, the resistors around IC5 (lower right in pic above) are R16, R17 and R18, as opposed to R23, R20 and R21 in the pic above.

The PCB itself will have the component values printed on it, can you take a pic of IC5 and its surrounding components?

 

[danwojaz]

I'd go with increasing the value of R18.
R17 is already a fairly low value — but I have no real understanding of why it is the value it is.


Run R18 into a trimmer or a pot to make it adjustable and fine tune it to where you like and then measure the trimmer/pot resistance and install the closest resistor value to the sum of R18 and the VR — or you could even just leave the trimmer/pot in and have the ability to change it as/when your needs change.


Mind, the circuit-snippet you posted matches the current build doc, but ... the ref-des of the PCB-pic in the shop doesn't match up with the schematic. All the components surrounding IC5 for instance...


View attachment 80240
In the posted schematic-snippet and build-doc schematic, the resistors around IC5 (lower right in pic above) are R16, R17 and R18, as opposed to R23, R20 and R21 in the pic above.

The PCB itself will have the component values printed on it, can you take a pic of IC5 and its surrounding components?

It looks like those were just updated on the build docs. I took a screenshot of it right before posting it to the thread.

 

[danwojaz]

Changing R18 to a 50K made it so the volume at 2-3 o clock is about the same as the volume knob at full volume.