I am working on a vero build that requires 150k pots. Using the Analog Alchemy page, I calculated what value resistors to put across the lugs of my pots. My vero build only requires soldering wires to lugs 2 and 3. Do I need to solder a resistor between lugs 1 and 2 AND lug 2 and 3, or can I get away with only soldering a resistor between the lugs I am using (2 and 3)?
(FYI, I am using 200k pots with 270k resistors to achieve 146k pot, according to the calculator, which is close enough for me.)
The maximum and minimum values of the pot will be correct, though you will modify the pot's taper. That might not be a problem though, depends on the circuit. You only need to solder the resistor to the 2 lugs you are using.
Quote from: drolo on February 15, 2017, 03:24:10 PM
The maximum and minimum values of the pot will be correct, though you will modify the pot's taper. That might not be a problem though, depends on the circuit. You only need to solder the resistor to the 2 lugs you are using.
I'm building a Keeley 4 knob compressor on vero. I don't know if the taper matters. Would I be better off just using 200k pots instead of 150K, in this case?
I'm afraid I have never seen that schematic, would you have a link to the one you are working with?
Quote from: drolo on February 15, 2017, 04:47:56 PM
I'm afraid I have never seen that schematic, would you have a link to the one you are working with?
I don't know which one they used for the Tagboard layout, but here is one that I hope helps.
(http://i650.photobucket.com/albums/uu229/MNhutDevil/Keeley_C4_Compressor_schem.jpg~original)
Based on the tagboard layout (because I'm looking at doing the same thing) I'd say you only need it across the lugs 2 and 3 for the clipping pot, and lugs 2 and 3 of the attack pot.
It's probably not going to be a big deal having 200k.
Give it a try and if you hear any weird stuff happening (I doubt it ) when the pots are maxed out at 200k add the resistor to bring the max resistance down.
I built this on stripboard a year ago, I don't remember for sure but I think I used a 100k pot and it was fine. I didn't notice anything weird and I didn't feel like it was missing any of its range. I never played an original to compare, so take what I say with a grain of salt. Luckily part of the fun of diy is that you get to experiment.
In this case you could try the 200k pots and then prop the resistor on there and try it that way too, see if there is a difference. Assuming you have solder lug pots that wouldn't be too difficult.