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flozki
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schematics of super simple pitch (dc servo motor) controller

Post: # 9612Unread post flozki
Mon Jun 28, 2010 7:21 pm

Hello
many people asked about a simple pitch controller schematics.
thats what i use normally for quick and dirty servo control. it works quite good.
i use it for pitch and also for turntable motors..there you need big motor.. so electronics needs to be built heavy as well. but principle is the same.
this is very simple and raw. so do your own variation. play around....

most parts can be grabbed from an old computer power supply.
for example case, radiator and fet, diodes. whatever...

almost any FET can be used.
i use normally LM324 quad opamp.
one for the regulator.
one for the reference voltage if i use single supply
one for lpi-meter buffer
and one can be used for propper control voltage
use a 78L05 for accurate control voltage.
attach both wires of the servo motor as close as possible to the opamp.
no ground loops.

use spindle trimmers 10-20 turns. 10k-100k whatever
one switch for 33/45 deluxe will be double switch with led indicator for 33/45 hehe
overcurrent protection with a shunt and one transistor will help.
stop (lock) switch also..
operating voltage 12-24 volts depending on motor you use.
use 100nF-220nF as a start. adjust for stable operation.

voila
happy soldering


Image

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Nickou
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Post: # 9618Unread post Nickou
Tue Jun 29, 2010 12:52 pm

Yes ,

many thanks
Vref is 0V ?

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d
Posts: 205
Joined: Thu Oct 05, 2006 7:42 am
Location: Lithuania

Post: # 9699Unread post d
Sun Jul 04, 2010 3:44 am

Hey!

It works very nice!!!

Soldered for cutterhead pitch control and will solder other for turntable.
This is really simple and good.

Thanks Flo!

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audadvnc
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Joined: Tue Jan 24, 2012 3:48 pm
Location: Minneapolis MN

Post: # 19525Unread post audadvnc
Sun May 06, 2012 7:27 pm

Any chance that somebody has a working link to these schematics?

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Jccc
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Post: # 21818Unread post Jccc
Sun Nov 11, 2012 11:59 am

does any one have the schematics for this?

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flozki
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Post: # 21823Unread post flozki
Sun Nov 11, 2012 7:20 pm

links repaired.

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