Millett "Starving Student" hybrid amp - Page 90

harbor freight has sets like that alot cheaper if you don't wanna spend that much. Obviously they're not as good of quality as Irwin, but they're also about $10 for a similar set IIRC, and they work fine for me (without a drill press, just a cordless drill)

I seem to have wired my volume pot strangely (or I have damaged it). it doesn't increase volume, but rather almost acts like a left right balance. Anyone have any idea of what I may have done wrong?

Does this help: How to Wire Panel Components (scroll down a bit for the potentiometer section)

You made a voltage divider between the two channels.
Tangent's guide pretty much applies to most stereo pots.
Just to make sure, put your multimeter between the input and ground. It should read ~50k(given that you're using a 50k pot) at any position on the pot.
Input/Output and Ground/output should vary as you turn the pot. (when the volume is maxed, input/output should read 0 ohms)

Hmm, I wired it up as in the pic ALPS RK27. How did I make a voltage divider? The only thing I can think of is that I used too much solder and some got inside the pot?

I did have it the reverse of how it should have been previously. It worked but in reverse. So I changed the inputs as per the tangent wiring pic. However, I just realized that I could have mixed up which input was which. If they were reversed and the central tabs stayed the same, that may account for it?

Sorry, I was thinking something else.
It's likely you switched the input and ground for one of the channels. (the channel that gets softer as you turn it clockwise)
Are you using the pot listed in pete's bom?

Pretty sure it is the right one from the BOM. It was a group buy we did here in Aus. I didn't order the pot. It is A50k. I have a B100k pot and a few others I was going to use in my guitar lying around. I am positive it is wired up right on the vol pot. Middle wiper tabs go to the tube socket tabs 5+6 I think. Far right tabs are inputs and far left is ground. It works fine when turned all the way up. Then I just need to use the computer to change vol. But that is only acceptable temporarily.

I am not superquick with a soldering iron and I had the input tabs/ground tabs reversed on the first go and redid them. So maybe all the heat has damaged the pot?

You said it acted as a left/right channel balance control?
But if you turn it all the way clockwise, everything is at max volume?

it isn't truly acting like a left right balance. it seems like the left channel is at a certain vol and turning it clockwise kicks in the other channel to a similar volume by the end of the dial. Seems kind of messed up...

That just means that the pot's left channel isn't working.

You're getting full volume from the left channel, meaning that your input and output are making good contact.. if the ground wire wasn't, then you'd simply have a 0-50k ohm resistor in series with the headphones.

I'm guessing that the pot is internally shorted (or the wiper is stuck in one position).

.

Hmm, I took it apart again, looked at the tabs, wiggled them a little, tried it again, and now it works fine. It must have been the cold hard stare that scared it back into proper working order

Where did you get those power buttons?

Its a vandal switch, usually momentary not latching so you will need some circuitry to get it to stay on. This one might be latching, if it is its great news, looks awesome!

lol, I never knew the difference when I ordered this. i am not using any additional circuit and it works. it must be latching


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