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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+Auto\s+tune\s+conversion\s+using\s+stepper\s+motors\?\s*$/: 6 ]

Total 6 documents matching your query.

1. [Amps] Auto tune conversion using stepper motors? (score: 1)
Author: Markku Oksanen <ww1c@outlook.com>
Date: Fri, 25 Apr 2014 07:24:36 +0000
All I have a home brew GU-84b amp that I don't seem to be able to sell so perhaps I keep it and upgrade a bit. The question is: Do stepping motors, properly used, big enough, etc. keep their position
/archives//html/Amps/2014-04/msg00219.html (7,364 bytes)

2. Re: [Amps] Auto tune conversion using stepper motors? (score: 1)
Author: MU 4CX250B <4cx250b@miamioh.edu>
Date: Fri, 25 Apr 2014 05:43:17 -0600
Markku, Stepper motors will work just fine for your application. Yes, one initializes the motors at power on, and then there is no need for additional control feedback. Initializing is easy with air
/archives//html/Amps/2014-04/msg00220.html (8,618 bytes)

3. Re: [Amps] Auto tune conversion using stepper motors? (score: 1)
Author: Markku Oksanen <ww1c@outlook.com>
Date: Sun, 27 Apr 2014 08:10:32 +0000
Hi Thanks for the ideas. Does anybody have a good idea how to find the "zero point" on vacuum cap without adding a potentiometer for position feedback? I was thinking about reflective optical sensors
/archives//html/Amps/2014-04/msg00229.html (7,991 bytes)

4. Re: [Amps] Auto tune conversion using stepper motors? (score: 1)
Author: peter chadwick <g8on@fsmail.net>
Date: Sun, 27 Apr 2014 10:46:01 +0200
Being somewhat cynical, I would rather rely on a system with microswitches to detect the end points rather than electronics - far less to go wrong. It's not difficult to do. 73 Peter G3RZP == Message
/archives//html/Amps/2014-04/msg00231.html (8,585 bytes)

5. Re: [Amps] Auto tune conversion using stepper motors? (score: 1)
Author: "Jim Garland" <4cx250b@miamioh.edu>
Date: Sun, 27 Apr 2014 06:48:38 -0600
Markku, your idea might work on glass variables, but you'd probably have to use laser diodes to focus a beam throught the gap. Another (easier) possibility might be to use the same technique SteppIR
/archives//html/Amps/2014-04/msg00233.html (10,362 bytes)

6. Re: [Amps] Auto tune conversion using stepper motors? (score: 1)
Author: "Jim Garland" <4cx250b@miamioh.edu>
Date: Sun, 27 Apr 2014 06:57:29 -0600
Actually, Peter, I think microswitches would be pretty difficult to implement, since vacuum variables are mult-turn devices. I know there were commercial ETO MRI amplifiers that used vacuum variables
/archives//html/Amps/2014-04/msg00234.html (10,393 bytes)


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