Smooth Analog Stepper Motor Control - Electronic Circuits Projects Diagrams Free

Bob Scott · 29th February 2008, 09:26 AM

blueroomelectronics · 29th February 2008, 03:16 PM

It's like the CMOS version of Roman Blacks popular stepper design.
http://www.romanblack.com/lini.htm

blueroomelectronics · 1st March 2008, 04:08 AM

I wonder what your circut waveform looks like? Have you built and tested it?

on1aag · 1st March 2008, 04:34 AM

Hi Bob,

I think you'll never gonna get that oscillator working at 16 kHz.

on1aag.

audioguru · 1st March 2008, 04:57 AM

The needle in a phono cartridge tracks the groove on a vinyl record.
Why does your tone arm need a motor to move it? Is its low friction bearing seized?

I haven't used my Shure cartridge for about 20 years. I think its needle has a weight in the groove of about 2 grams.

blueroomelectronics · 1st March 2008, 05:38 AM

Guess the OP wants one of these things.
I doubt it's a stepper though, probably a long worm gear and a synchronous motor.

**Nigel Goodwin** · 1st March 2008, 02:54 PM

Quote:

Originally Posted by blueroomelectronics

Guess the OP wants one of these things.
I doubt it's a stepper though, probably a long worm gear and a synchronous motor.

Certainly not a stepper (could you imagine a worse choice?), and certainly not a syncronous motor either - it's a simple DC motor feeding a long worm gear, as part of a servo system. The arm has a small amount of horizontal movement, so tracks across the record as normal - at the rear of the arm is a slotted opto-coupler, and as the arm tracks it blocks the slot - this triggers the DC motor which moves the pivot point of the arm to catch back up again. A CD tracks in a very similar way, but with no mechanical contacts or sensors.

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29th February 2008, 09:26 AM	#1
Bob Scott	Attached Thumbnails Last edited by Bob Scott; 2nd March 2008 at 03:00 PM.

29th February 2008, 03:16 PM	#2
blueroomelectronics	It's like the CMOS version of Roman Blacks popular stepper design. http://www.romanblack.com/lini.htm __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com/

1st March 2008, 04:08 AM	#3
blueroomelectronics	I wonder what your circut waveform looks like? Have you built and tested it? __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com/

1st March 2008, 04:57 AM	#5
audioguru	The needle in a phono cartridge tracks the groove on a vinyl record. Why does your tone arm need a motor to move it? Is its low friction bearing seized? I haven't used my Shure cartridge for about 20 years. I think its needle has a weight in the groove of about 2 grams. __________________ Uncle $crooge

1st March 2008, 05:38 AM	#6
blueroomelectronics	Guess the OP wants one of these things. I doubt it's a stepper though, probably a long worm gear and a synchronous motor. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com/