Non-MB Rangemaster Mod Help

[ddog]

So I'm building a Rangemaster using this PCB:



Would it be possible to add a range mod like this:


How would I modify the above schematic?

[midwayfair]

There's a hole north of C1 on one side and another hole just right of the other side of that capacitor.

Put a 100K pot in series with a bigger cap ... let's say 22nF. That'll give a pretty wide range. You can hook it up like this:

1
2
3

1: (connect to 2)
2: Pad on the other side of C1.
3: One side of the 22nF capacitor.

The other side of the 22nF capacitor goes to the unused pad next to C1.

When the pot is at minimum, there is 100K of resistance in series with the 22nF capacitor, meaning it has very little effect on the circuit.

When the pot is at maximum, there is no resistance between lugs 2 and 3, so there is no resistance in series with the capacitor. It's now fully in the circuit.

[ddog]

Thanks Jon!

It would look something like this right?: