Soft-start -VS- CL60 Thermister's - diyAudio
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Old 16th November 2012, 07:55 AM   #1
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Default Soft-start -VS- CL60 Thermister's

The Diyaudio store has a soft-start pcb, Mr Pass shows only the CL60's in his schematic's can anyone give their options on using either ? Which is better and why ? Or are both needed when constructing a F4 or F5 type amp ? Thank-you !

Last edited by thor61; 16th November 2012 at 07:57 AM.
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Old 16th November 2012, 11:06 AM   #2
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i prefer soft-start. i use hypex soft-start with CL-60's insted of resistors
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Old 16th November 2012, 12:49 PM   #3
Marra is offline Marra  United Kingdom
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Like Audiosan I prefer a soft start.I've been using one of these for some years.Not the cheapest but works well.

soft start electronics for audiophile hifi audio amplifiers : avondale audio
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Old 16th November 2012, 01:01 PM   #4
ersa191 is offline ersa191  Equatorial Guinea
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I think that soft start is better then NTC, because CL-60 wont be in his strength, unless he cools off, short time on/of/on
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Old 16th November 2012, 02:35 PM   #5
Zen Mod is offline Zen Mod  Serbia
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best thing is bstrd of these two

soft start circuit with NTCs instead of fixed resistors

do not forget that soft start must be optimized for each particular case , to avoid abrupt currents when switching relay ON

that solution covers case of blackouts , which is only case where simple -NTC in line- solution is critical
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Old 16th November 2012, 11:57 PM   #6
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CL60 is the most simple and time tested. I usually connect a CL60 to it's own DPDT swtich, turn amp on, wait 3 seconds, then turn off the CL60. Just don't forget to 'enable' CL60 prior to next power up.
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Old 17th November 2012, 12:05 AM   #7
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well. that is exactly what a simple softstart will do. and you don't need te remember to do all that manualy. so i will say that a simple softstart with CL-60's insted of fixed resistors are the easy way.
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Old 17th November 2012, 12:29 AM   #8
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sure, it adds a step, but no pcb is necessary.
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Old 17th November 2012, 12:34 AM   #9
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I've used the Pass CL60 design and have no problems. Why make things more complicated?

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Dan
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Old 17th November 2012, 12:57 AM   #10
Zen Mod is offline Zen Mod  Serbia
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just in case if you're having both monstrous C bank ( and adequate xformer ) and often blackouts in mains

result is burned fuse
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