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Old 10th February 2005, 05:28 AM   #11
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I will definately use sockets and I will definately get TL072's to try when I have something else to order with 'em.

What do you mean with the pots?

Measuring them they go from 0 - 10k in the first half and 10k-50k in the second half... but with my 10k resistor in series things seem to work out not all that bad (40hz min, 117hz halfway, 230hz max for the corner freq.)

edit: I did fix those hastily connected pots and one of the opamps was backwards too

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Old 10th February 2005, 08:44 AM   #12
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I don't get what he means about the pot either. From your measurements it sounds like you have a log pot, is that correct?
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Old 10th February 2005, 03:31 PM   #13
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Yeah... its not linear

I believe it was a balance control on the receiver it came off of. A neat little extra feature is that it has 2 knobs each controlling 2 pots... they turn together but can be turned separately so I could set both LPF's differently if I wanted.

The amp they came off of was full of such goodies. It was a really old "quadraphonic" kenwood amp.

a few goodies:

2X 4-ganged 50k pots
4-ganged 100k pot
a few dual ganged pots
push button switches: SPST,DPDT, 4-pole double throw and 8-pole double throw
and a couple huge rotary selector switches.
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Old 12th February 2005, 03:08 AM   #14
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Quote:
Originally posted by richie00boy
I don't get what he means about the pot either. From your measurements it sounds like you have a log pot, is that correct?
What I mean is if you, for example, have a volume pot in there somewhere. You want it so that turning the knob clockwise will increase the volume.

But I guess its not that important, stuff like cutoff can be either way, as long as its labelled.

Looks good
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Old 12th February 2005, 09:46 AM   #15
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See what you mean now, yeah good point. I've seen log pots connected the wrong way round a few times
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Old 12th February 2005, 09:08 PM   #16
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But I'm using it as a variable resistor...The worst I could do is have it backwards which would reverse which way I have to go to increase frequency. All I gotta do is hook it up so it's at 50k when turned all the way to the left. It's not like a log pot as a volume control where if it's backwards the control would be almost useless.
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