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- Thread starter Miles Teg
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I'm sure that one little explication on the thermistor and there species in Aleph must be most usefull.

Thanks.

Sorry if this has been beaten to death, but I read the Aleph 2 service manual and got a bit confused about the TH1 which is to operate at 5 Ohm and TH2 (CL-60) which has a 10 Ohm specification.

Now the CL-40 has a 5 Ohm rating, so is it OK to use it for TH1 and CL-60 for TH2?

Thanks, and sorry about my ignorance concerning thermistors

Mr. NP thank you for the replay. Here is additional info.

10 Ohm at no load @ 25C

5 Amp - Max Steady State Current

.18 Ohm - Approx Res @ I max

16 Ohm at no load @ 25C

4 Amp - Max Steady State Current

.27 Ohm - Approx Res @ I max

So for this particular Thermistor CL-70 which has 16Ohm resistance and 4A current, I guess if I put 2 in parallel that should drop the resistance even more and increase the current for the regular state.????? Unless I am wrong in my calculations.

Thank you kindly in advance.

Trigon.:headscrat

Does the thermister takes a long time to reach steady state conditions, since its resistance depends on case temperature?

Obvious alternate approach is a resistor on the mains side of the transformer bypassed by relay contacts that cut in after say 10 seconds.

Any comments?

Nix

Type: B57238S100M000 has 10ohm resistance at 25°C and max current is 5A.

It's usefull for switch-mode power supplies and soft-start motors,..(probably is usefull also for power-up toroid transformer).

Does anyone have some expirience with this thermistors ?

best regards,

Leon

Nelson Pass said:I use CL60's at 2 to 2.5 amps, and not above, as they

get quite hot. I have seen failures at 4 amps or so, so

above 2 amps I run 1 each on the dual primary windings.

Hi,

I'm plan to use only 2 thermistor CL50 one at primary windings.

of X'former and the other one for the safety ground. Is this going

cause any problem coz the total capacitance value for my Aleph5 power supply is 317mF?

Specs for the thermistor CL50

1. 7 ohms at 25 degrees C ( ambient )

2. Max steady current - 5 Amps

Thanks

cb

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