Alright, drawing stuff here. Noticed i had some 100k digital pots, so will try them out while i wait for my LDR order to deliver.
If i want to "emulate" a gain pot for example that is 1M, but the digital pots and ldrs are only up to 100k, and jfets even lower. the pot is located between 2 gain stages, 1 to GND, 2 to stage 2, 3 to stage 1.
The only solution i came up with (and i'm not even sure that it's a usable one) was to connect a buffer in place of 2 with a 1M resistor to GND, and another in place of 3 with a 100k attenuator after it, in order not to mess up the impedance of the circuit. seems a bit clumsy... How would you guys that actually know what you're doing go about this?
If i want to "emulate" a gain pot for example that is 1M, but the digital pots and ldrs are only up to 100k, and jfets even lower. the pot is located between 2 gain stages, 1 to GND, 2 to stage 2, 3 to stage 1.
The only solution i came up with (and i'm not even sure that it's a usable one) was to connect a buffer in place of 2 with a 1M resistor to GND, and another in place of 3 with a 100k attenuator after it, in order not to mess up the impedance of the circuit. seems a bit clumsy... How would you guys that actually know what you're doing go about this?