CRC or CTC for PSU of Aleph-X

jrsun · 5th September 2004, 12:53 AM

C1 - R - C2
or
C1 - Thermistors - C2

C1, C2: 68mf, 9.4 mohm ESR
R: 2 0.47/5W in parallel
Thermistor: 2 CL-60 in parallel, 10ohm/18mohm

Can thermistors in CTC still provide inrush current protection ?
Thanks!

moe29 · 5th September 2004, 03:41 AM

I think Peter Daniel used them in his Aleph-X. Shouldn't be a problem.

I'm not sure about inrush current...

On my Aleph 2's I used the CL-60 part on the AC line - before
the transformer.

(I think there's a schematic on Digikey in the product info of the
CL-60 that shows common useage)

m.

batee · 5th September 2004, 04:16 AM

Only one set of T's between the Caps (CTC): Since C1 is still connected directly to the rectifier, it's still going to cause a huge inrush. Since C1 is usually larger than C2 (higher ripple current, so put more in parallel), the majority of inrush current remains.

I think I remember someone saying that the XA200 that Nelson showed in pics had three sets of thermistors. Here's how I'd guess they're arranged:

One set of four in parallel on the primary side of the transformer, and one set of four on each of the rails (+/-) between C1 and C2.

Got some stuff on order and plan to build this ckt unless someone comes up with a better idea.

Bryan

Wes Marquenie · 5th September 2004, 07:47 AM

I remember passlabs stopt using them, because of the thermal runaway when using thermistors in parallel.

jrsun · 5th September 2004, 07:22 PM

Thanks for the responses !
Looks like CRC plus CL-60s at the primary ends is the way to go !

5th September 2004, 12:53 AM	#1
jrsun diyAudio Member Join Date: Sep 2003 Location: North NJ	CRC or CTC for PSU of Aleph-X C1 - R - C2 or C1 - Thermistors - C2 C1, C2: 68mf, 9.4 mohm ESR R: 2 0.47/5W in parallel Thermistor: 2 CL-60 in parallel, 10ohm/18mohm Can thermistors in CTC still provide inrush current protection ? Thanks!

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5th September 2004, 03:41 AM	#2
moe29 diyAudio Member Join Date: Dec 2002 Location: Florida	I think Peter Daniel used them in his Aleph-X. Shouldn't be a problem. I'm not sure about inrush current... On my Aleph 2's I used the CL-60 part on the AC line - before the transformer. (I think there's a schematic on Digikey in the product info of the CL-60 that shows common useage) m.

5th September 2004, 04:16 AM	#3
batee diyAudio Member Join Date: Mar 2004 Location: Rolla, MO	Only one set of T's between the Caps (CTC): Since C1 is still connected directly to the rectifier, it's still going to cause a huge inrush. Since C1 is usually larger than C2 (higher ripple current, so put more in parallel), the majority of inrush current remains. I think I remember someone saying that the XA200 that Nelson showed in pics had three sets of thermistors. Here's how I'd guess they're arranged: One set of four in parallel on the primary side of the transformer, and one set of four on each of the rails (+/-) between C1 and C2. Got some stuff on order and plan to build this ckt unless someone comes up with a better idea. Bryan

5th September 2004, 07:47 AM	#4
Wes Marquenie diyAudio Member Join Date: Jan 2003 Location: Enschede	I remember passlabs stopt using them, because of the thermal runaway when using thermistors in parallel.

5th September 2004, 07:22 PM	#5
jrsun diyAudio Member Join Date: Sep 2003 Location: North NJ	Thanks for the responses ! Looks like CRC plus CL-60s at the primary ends is the way to go !

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