Phrazemaster
Well-known member
Hi everyone,
I've been puzzling over what seems like a simple thing: 2 potentiometers in series. The purpose is to have a "course adjustment" and a "fine adjustment," with the first pot 100K and the second pot 1K. I'm using the PRR FET Tester circuit, and I'm finding having just the one 100K pot very challenging in matching FETS because at certain voltages you only breathe on the 100K pot and it moves. I need the fine adjustment.
Of course I have googled this and I'm embarrassed how many hours, how much money on parts, and how many which-ways I've tried to wire this.
Attached is the circuit, and in the next post I'll put the variations I tried based on a google.
Thanks in advance; I just really want to crack this nut and get this thing done; it's been at least a week (no joke!).
I've been puzzling over what seems like a simple thing: 2 potentiometers in series. The purpose is to have a "course adjustment" and a "fine adjustment," with the first pot 100K and the second pot 1K. I'm using the PRR FET Tester circuit, and I'm finding having just the one 100K pot very challenging in matching FETS because at certain voltages you only breathe on the 100K pot and it moves. I need the fine adjustment.
Of course I have googled this and I'm embarrassed how many hours, how much money on parts, and how many which-ways I've tried to wire this.
Attached is the circuit, and in the next post I'll put the variations I tried based on a google.
Thanks in advance; I just really want to crack this nut and get this thing done; it's been at least a week (no joke!).