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Old 24th September 2003, 01:57 AM   #11
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Quote:
Originally posted by fdegrove
Hi,

Want to keep bias constant and stil have good control?

Use a contsant impedance series switched volume control.

Take it before I have it patented,:rolleyes:
Is this a dual linear pot wired to ground so that as one goes up the other goes down and the signal is merely tapped from one of the wipers?

Oh yeah, and sorry but, once publicly disclosed, never patentable. ;-P

:)ensen.
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Old 24th September 2003, 08:55 AM   #12
Kay is offline Kay
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>Is the pot parallel to the 1K resistor (ie. connected to ground)?

No,
its between Input-Signal and the 1k
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Old 24th September 2003, 09:49 PM   #13
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Hi,

Quote:
Is this a dual linear pot wired to ground so that as one goes up the other goes down and the signal is merely tapped from one of the wipers?
That's one possible sollution...another is, how simple can it get, an ordinary series attenuator.

Quote:
Oh yeah, and sorry but, once publicly disclosed, never patentable. ;-P
You didn't think for a minute I was serious about that, were you?

Cheers,
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Old 24th September 2003, 10:09 PM   #14
jam is offline jam  United States
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Frank,

We will make a solid state guy out of you yet!

Regards,
Jam
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Old 24th September 2003, 10:31 PM   #15
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Hi,

Quote:
We will make a solid state guy out of you yet!
Nice try, Jam.

As much as I hate to disappoint any of you, tubes are my life....they're fascinating things.

Semi-combustors are just lifeless things to me...

Cheers,

P.S. Wot? No picture?
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Old 24th September 2003, 10:36 PM   #16
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Default Closed Loop Gain

As Millwood pointed out my error, I mean to write closed loop gain. As you decrease feed ratio the bandwidth of the closed loop will increase. Normally this is not a bad thing if you opamp is unity gain stable. Most of the slow speed opamp like OP27 will run at a gain of one, however many high-speed units like the OP37 will oscillate.

Just put the pot on the input
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Old 24th September 2003, 10:41 PM   #17
jam is offline jam  United States
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Frank,

My favourite vacuum tube ..........
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Old 24th September 2003, 10:44 PM   #18
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Hi,

Ah...

Well, at least that coffee would be a Danish designed one...

LOL.

Cheers, Jam.
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