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Old 18th August 2013, 06:46 PM   #1091
tinitus is offline tinitus  Europe
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take a look at F5 manual
power supply is show at the end of it

http://www.firstwatt.com/pdf/prod_f5_man.pdf
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Old 18th August 2013, 06:55 PM   #1092
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Thanks tinitus but that is mostly the same diagram as for the BA-2 build. Nelson has shown two 120V primaries joined by the thermistor for a 240V supply ( I did this on the first build) but I have a single 230V winding. It seems logical to me to use a CL60 in series to this but I just want to be sure.
Chris
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Old 18th August 2013, 07:27 PM   #1093
tinitus is offline tinitus  Europe
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I think basicly what it shows is that each primary should be 'seperated' from mains by a thermistor
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Old 18th August 2013, 07:31 PM   #1094
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The fault is entirely mine. How many thermistors would appear in the primary winding circuit for a 230V supply?
Chris

Last edited by Backbones; 18th August 2013 at 07:34 PM.
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Old 18th August 2013, 07:35 PM   #1095
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by Backbones View Post
The fault is entirely mine. How many thermistors appear in the primary winding circuit?
Chris
if you follow Nelson's curcuit with parallel primaries, there will be two thermistors, one on each winding

hey, I know no more than you, and what I see in the schematic
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Old 18th August 2013, 07:50 PM   #1096
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Yes it's that parallel primaries thing that worries me. One thermistor doesn't look balanced (balanced in a visual sense rather than electrical) for two primaries.
I'm sure you do know more than me. There can't be two people as dumb as me.
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Old 18th August 2013, 08:22 PM   #1097
Itsmee is offline Itsmee  England
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Quote:
Originally Posted by Backbones View Post
I am putting two 200VA transformers into one box each with a 230V primary.
I have built several amps with a 500VA transformer and 400,000uF reservoir capacitance; one CL60 seems to be sufficient, I haven't blown a 3,15A mains fuse yet.
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Old 18th August 2013, 08:28 PM   #1098
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Originally Posted by Itsmee View Post
one CL60 seems to be sufficient, I haven't blown a 3,15A mains fuse yet.
One CL60 it is then!
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Old 23rd August 2013, 10:13 AM   #1099
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I thought the matter was settled, however, I have run out of CL-60 thermistors but I do have a mis-purchase left over from a previous order of several Honeywell ICL-15 devices.
They are rated at 5ohms at 25deg C and max current of 6amps.
Could I use one of these instead of the CL60 or even join two in series to match the 10ohm resistance of the CL60? How critical is the thermistor resistance?
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Old 23rd August 2013, 12:01 PM   #1100
AndrewT is offline AndrewT  Scotland
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The 10ohms of a CL60 matches well for transformers operating from 110/120Vac supplies.

For 220/240Vac supplies you get more appropriate values of current limiting using a pair of series connected CL60.

Four of your 5ohms would give adequate limiting for 300VA to 600VA, 240Vac transformers.
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