Cl-60

billy · 28th January 2003, 01:35 AM

Hello, can i use some resistor instead of CL-60 ?

rwagter · 28th January 2003, 02:13 AM

You mean for limiting inrush current:

Nope

The CL-60 is a thermally sensitive semiconductor resistors which show a decrease in resistance as temperature increases.

A so called soft-start module doesn't use a thermistor but often relies on a resistor network an relais

Ralph

Peter Daniel · 28th January 2003, 02:27 AM

It's not practical to use resistor for inrush protection on primaries, but if you think about using resistors instead of thermistors in CRC filtering, it's perfectly acceptable.

Coulomb · 28th January 2003, 02:48 PM

Peter I have not been following along with a lot of threads lately. What is the Application for CRC filtering?

Anthony

Peter Daniel · 28th January 2003, 03:30 PM

Originally, in Aleph AX, Nelson was using 4 paralleled CL-60 thermistors between capacitors banks (instead of chockes) for PS filtering. I also use those thermistors for filtering and they work pretty well providing additional inrush protection as well. The alternative would be using 0.3-0.5 power resistors instead of chokes or thermistors.

Coulomb · 28th January 2003, 09:13 PM

Wow that's a lot of DC current, do they run Hot? What about the reduced ability to handle surge currents due to a small diameter lead?

Anthony

rwagter · 28th January 2003, 09:39 PM

I thought I'd read somewhere that there were some problems with the Thermistor trick as a CRC and here is the link to support is by the One and Only himself:

Parallel Thermistors

Nobody ever reallysolved this althought possible solutions are mentioned

Ralph

Peter Daniel · 28th January 2003, 09:57 PM

They run so hot, that you can't touch them. As to the leads diameter and handling inrush currents, I think that they are still bigger gauge than the fuse element.

Coulomb · 29th January 2003, 03:05 AM

Quote:

Originally posted by Peter Daniel
They run so hot, that you can't touch them. As to the leads diameter and handling inrush currents, I think that they are still bigger gauge than the fuse element.

Point taken, but I do not use fuses after the AC Mains, then it's a ThermoMagnetic Breaker.

Anthony

paulb · 29th January 2003, 03:44 AM

So...
What about using a CL-60 on the AC side in a Class AB amp?

I have big caps, 61mF - okay, not that big, but big enough I need some inrush protection and I don't want to be bothered with the whole relay delay thing. I'm making a quick 'n' dirty amp.
I figure the caps are big enough to handle the peak draw from the amp, and the only downside could be the additional resistance of the CL-60 when the amp is at idle or low power. Which shouldn't be a problem because the caps are big.
The amp's an ESP P3A, 48VCT transformer, about 34V rails, maybe 80W/ch into 4 ohms.

Thanks for your thoughts...

28th January 2003, 01:35 AM	#1
billy diyAudio Member Join Date: Dec 2001 Location: Hong Kong	Cl-60 Hello, can i use some resistor instead of CL-60 ?

28th January 2003, 02:27 AM	#3
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	It's not practical to use resistor for inrush protection on primaries, but if you think about using resistors instead of thermistors in CRC filtering, it's perfectly acceptable. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

28th January 2003, 03:30 PM	#5
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Originally, in Aleph AX, Nelson was using 4 paralleled CL-60 thermistors between capacitors banks (instead of chockes) for PS filtering. I also use those thermistors for filtering and they work pretty well providing additional inrush protection as well. The alternative would be using 0.3-0.5 power resistors instead of chokes or thermistors. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

28th January 2003, 09:57 PM	#8
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	They run so hot, that you can't touch them. As to the leads diameter and handling inrush currents, I think that they are still bigger gauge than the fuse element. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

29th January 2003, 03:44 AM	#10
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	CL-60 in an AB amp So... What about using a CL-60 on the AC side in a Class AB amp? I have big caps, 61mF - okay, not that big, but big enough I need some inrush protection and I don't want to be bothered with the whole relay delay thing. I'm making a quick 'n' dirty amp. I figure the caps are big enough to handle the peak draw from the amp, and the only downside could be the additional resistance of the CL-60 when the amp is at idle or low power. Which shouldn't be a problem because the caps are big. The amp's an ESP P3A, 48VCT transformer, about 34V rails, maybe 80W/ch into 4 ohms. Thanks for your thoughts...


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28th January 2003, 02:13 AM	#2
rwagter diyAudio Member Join Date: Jul 2002 Location: Netherlands	You mean for limiting inrush current: Nope The CL-60 is a thermally sensitive semiconductor resistors which show a decrease in resistance as temperature increases. A so called soft-start module doesn't use a thermistor but often relies on a resistor network an relais Ralph

28th January 2003, 02:48 PM	#4
Coulomb diyAudio Member Join Date: Jul 2002 Location: Ancaster, Ontario	Peter I have not been following along with a lot of threads lately. What is the Application for CRC filtering? Anthony

28th January 2003, 09:13 PM	#6
Coulomb diyAudio Member Join Date: Jul 2002 Location: Ancaster, Ontario	Wow that's a lot of DC current, do they run Hot? What about the reduced ability to handle surge currents due to a small diameter lead? Anthony

28th January 2003, 09:39 PM	#7
rwagter diyAudio Member Join Date: Jul 2002 Location: Netherlands	I thought I'd read somewhere that there were some problems with the Thermistor trick as a CRC and here is the link to support is by the One and Only himself: Parallel Thermistors Nobody ever reallysolved this althought possible solutions are mentioned Ralph

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