I want to modify a DC-DC step-up converter that uses a single potentiometer that sets the voltage to use a single SPDT switch where I can select the output voltage during operation without turning the module off.
I think that I need a resistor in parallel to the switch so when there is switchover there is some resistance and not open circuit to not blow the chip up.
The main chip is SX1308/MT3608.
Vout to be set at 10.6V and 10.8V, because these values are so close I want to use poteniometers to set the voltage manually instead of trying to string resistors. My only limtation are the potentiometers, as I only have 10K and 100K on hand, the R1 and R2 are not a problem if these would be E12 standard values.
I've recreated the PCB (I think it's correct) of the module with my attempt at making what I want to achieve.
Edit: instead of trying to switch from one or the other resistor, have a switch in parallel to the resistor and switch it.
I'm not sure if the circuit is correct, as the original circuit has the 3 pins of potentiometer connected, it connects the wiper to the feedback pin.