Once again DC-Motor circuit…

planet IX · 17th November 2005, 10:47 AM

So far I’ve tried out several ways of driving the platter of my turntable:
Original Scheu Motor (okay); Scheu with Battery Supply (better); Maxon with L200 regulator circuitry (even better) and also several Strings and Belts…
Now I’ve ordered a LT1083 to test the easies way to feed the motor... My question: Does it make sense, to put a large electrolytic capacitor (~100…1000µF) behind the regulator respectively parallel to the motor? My thought was, that if the motor is slowed down, the capacitor could supply the increased current, the motor then consumes. Or could this cause an oscillation of the regulator (as it does on the L200 circuit, I use at present)?
Thanks, Boris

jackinnj · 17th November 2005, 12:14 PM

the LT1083 is a "Low Dropout" regulator -- thus the capacitor is part of the feedback loop and can make the situation, better, worse or indifferent deptending onthe cap's Value and ESR. Linear has hints on their website.

With some of their LDO regulators I have found that a 10uF tantalum bypassed with a ceramic chip (I use SMT devices here) works where an aluminum electrolytic causes oscillation.

17th November 2005, 10:47 AM	#1
planet IX diyAudio Member Join Date: Mar 2004 Location: Cologne	Once again DC-Motor circuit… So far I’ve tried out several ways of driving the platter of my turntable: Original Scheu Motor (okay); Scheu with Battery Supply (better); Maxon with L200 regulator circuitry (even better) and also several Strings and Belts… Now I’ve ordered a LT1083 to test the easies way to feed the motor... My question: Does it make sense, to put a large electrolytic capacitor (~100…1000µF) behind the regulator respectively parallel to the motor? My thought was, that if the motor is slowed down, the capacitor could supply the increased current, the motor then consumes. Or could this cause an oscillation of the regulator (as it does on the L200 circuit, I use at present)? Thanks, Boris

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17th November 2005, 12:14 PM	#2
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	the LT1083 is a "Low Dropout" regulator -- thus the capacitor is part of the feedback loop and can make the situation, better, worse or indifferent deptending onthe cap's Value and ESR. Linear has hints on their website. With some of their LDO regulators I have found that a 10uF tantalum bypassed with a ceramic chip (I use SMT devices here) works where an aluminum electrolytic causes oscillation.

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