switch noise

kffern · 18th February 2009, 11:00 AM

Hi,
I am wiring up a Rega (Premotec) motor using a 0.22uF 240v cap and 8K resistor.
It works very well but I get a click through the system when I turn the SPST switch on. I think I should be fitting a cap across the switch or a MOV across the live and neutral. I'm not sure which or the correct values.
Can someone help?

Thanks,
Kffern

tubenut · 21st February 2009, 03:46 AM

Try 0.01 mfd over the switch but use a suitably rated cap.

I think the reason Rega do not fit one may be that using just the SPST with a cap across it allows may allow a little current flow through the motor etc even in off position.
Linn, on their basic supply, used caps on the switch but they used a DPST for live and neutral.

kffern · 22nd February 2009, 12:21 AM

Thanks Tubenut,

I should have known as my Lenco has a 0.0039 uF cap across the spst switch. Finding such a low value is difficult but I can get a 0.01uf X2 cap quite cheaply. It's actually for a Luxman A522 which I converted to a Rega motor with bearing/subplatter.

Regards,

Kffern

18th February 2009, 11:00 AM	#1
kffern diyAudio Member Join Date: May 2006 Location: Perth	switch noise Hi, I am wiring up a Rega (Premotec) motor using a 0.22uF 240v cap and 8K resistor. It works very well but I get a click through the system when I turn the SPST switch on. I think I should be fitting a cap across the switch or a MOV across the live and neutral. I'm not sure which or the correct values. Can someone help? Thanks, Kffern

21st February 2009, 03:46 AM	#2
tubenut diyAudio Member Join Date: Nov 2002 Location: South Africa, Jhb	Try 0.01 mfd over the switch but use a suitably rated cap. I think the reason Rega do not fit one may be that using just the SPST with a cap across it allows may allow a little current flow through the motor etc even in off position. Linn, on their basic supply, used caps on the switch but they used a DPST for live and neutral. __________________ Guillaume Croak Audio Exploration

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22nd February 2009, 12:21 AM	#3
kffern diyAudio Member Join Date: May 2006 Location: Perth	Thanks Tubenut, I should have known as my Lenco has a 0.0039 uF cap across the spst switch. Finding such a low value is difficult but I can get a 0.01uf X2 cap quite cheaply. It's actually for a Luxman A522 which I converted to a Rega motor with bearing/subplatter. Regards, Kffern

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