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Old 7th July 2010, 09:26 PM   #21
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Quote:
Originally Posted by thanh1973 View Post
what about your power supply?
Good eye. The 2 wires coming off the power inlet holes are going to be hooked to (2) 9 volt batteries for now. I'll eventually replace it with something else. any suggestions? I've put in for Teabags boards....

Russellc
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Old 27th March 2011, 05:03 PM   #22
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The knobs for the pec pots. What kind are they? All the knobs I have been looking at either I can't find the datasheet (allthough I admit not having searched all that much) or they are just 6mm. Should be 6.32, no?
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Old 27th March 2011, 08:15 PM   #23
Marra is offline Marra  United Kingdom
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Originally Posted by MagnumOpus View Post
The knobs for the pec pots. What kind are they? All the knobs I have been looking at either I can't find the datasheet (allthough I admit not having searched all that much) or they are just 6mm. Should be 6.32, no?
Yes you're right; the PEC pots being Canadian/American are the equivalent of the old English imperial 1/4inch.
These from RS are a nice Knob. They used to do them in 1/4 inch but you'll have to search.
| Passives | Resistors | Knobs and Dials | Aluminium Knobs
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Old 27th March 2011, 09:36 PM   #24
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Originally Posted by MagnumOpus View Post
The knobs for the pec pots. What kind are they? All the knobs I have been looking at either I can't find the datasheet (allthough I admit not having searched all that much) or they are just 6mm. Should be 6.32, no?
Let me look. It was either Mouser or Digikey. I'll be back.


Yes, have a look with mouser: 450-3000

Russellc

Last edited by Russellc; 27th March 2011 at 09:41 PM.
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Old 27th March 2011, 10:13 PM   #25
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Thanks you. Have you tried the PEC stereo pot? I read Peter Daniels give some praise to it. I am thinking I use that one instead of dual mono pots...

Nice build you've got btw.
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Old 29th March 2011, 09:34 PM   #26
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Quote:
Originally Posted by MagnumOpus View Post
Thanks you. Have you tried the PEC stereo pot? I read Peter Daniels give some praise to it. I am thinking I use that one instead of dual mono pots...

Nice build you've got btw.
Some complained about the channel to channel tracking of the stereo pot. Not a problem with the individual pots, it gives a way to have a "balance" function, and two is how the original is.

russellc
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Old 30th March 2011, 08:00 AM   #27
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Originally Posted by Russellc View Post
Some complained about the channel to channel tracking of the stereo pot. Not a problem with the individual pots, it gives a way to have a "balance" function, and two is how the original is.

russellc

Yes, I read the thread wherein he says that some people don't like the "mushy" sound and mentions the stereo pot syncronicity issue. I ordered dual mono's myself.
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Old 30th March 2011, 10:51 AM   #28
AndrewT is offline AndrewT  Scotland
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The Aikido switched attenuator from Glassware is designed to offer that facility.
A master volume control in the centre gives big dB steps two channels & 6positions/steps.
Either side is a dedicated L and R small dB steps adjustment that can be used to fine tune the volume or used to balance up an unbalanced stereo signal. These are single channel 12position/step switches.
In practice it works very well.

I tend to leave the L & R set to -0dB and use the master to give 10dB steps from -0dB to -50dB. If I want to be finicky I can add a bit extra attenuation by stepping the L+R down in steps of -0.9dB to give a slightly lower volume.

Because it uses 3 cheap single wafer switches, it gives good value for money.
0.9dB steps from -0dB to -59.9dB and balance control, is as much as I could ever ask of a switched attenuator.

If you want more info on correcting an error see my earlier Aikido post.
adequate volume control?

It would also make a very good wide range LED/LDR controller pot with balance at each volume step.
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Last edited by AndrewT; 30th March 2011 at 10:57 AM.
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