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Old 5th December 2012, 10:23 PM   #1071
rsavas is offline rsavas  Canada
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C1, according to National ap1849, to protect against turn-on/off spikes, Pioneer did not use it = optional
C3, Nationals idea, another optional, yes a film cap would do as well= better. I used 5mm lead spacing.
Thinking of adding 2 triacs, controlled by opto's, in series with the line & in parallel with K1 so that I can add MCU control option, would require separate power for MCU, more PS what can I say.
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Old 30th December 2012, 09:21 PM   #1072
zcables is offline zcables  United States
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I'm replacing the C5 470uF caps with new electrolytics, but I just realized that the originals are bipolar and my new ones are standard polarized. Which way should I install the polarized caps in the circuit, or will it not work at all?

Thanks for the help!
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Old 30th December 2012, 10:17 PM   #1073
zcables is offline zcables  United States
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Got it; thanks!
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Old 31st December 2012, 02:21 PM   #1074
amp_guy is offline amp_guy  United States
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outboard softstart, hmmm smell of a good idea! as space in the Hafler chassis is non existant. Thanks for that!.

Oh yeah 470uf bi-polar = 2 1000uf polarized types connected in series, sorry.
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Old 1st January 2013, 06:40 AM   #1075
djk is offline djk
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Real easy to install a 2.5Ω thermistor on the terminal strip behind the power switch, I've done it several times.

http://www.digikey.com/product-detai...081-ND/2539563

http://www.digikey.com/product-detai...1158-ND/227599

http://www.digikey.com/product-detai...1170-ND/227611

http://www.digikey.com/product-detai...1146-ND/227587
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Last edited by djk; 1st January 2013 at 06:46 AM.
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Old 9th January 2013, 02:46 AM   #1076
eyoung is offline eyoung  United States
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Hola Y'all...

has anybody tried replacing lateral mosfets with hexfets ala IRFP240/9240???

Regards, El
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Old 9th January 2013, 08:48 AM   #1077
djk is offline djk
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While in theory it could be done, I would not recommend trying it at all.

The bias circuit would have to be redesigned for the much higher gate voltages, and temperature compensation. The pin-outs are different. Source resistors would need to be added. The device threshold voltages would need to be matched. The frequency compensation would need to be changed. Fold-back current limiting would be a good idea, the IRF type do not protect themselves like the Hitachi type do. Etc.

But yes, it is possible.
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Old 9th January 2013, 11:12 AM   #1078
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Quote:
Originally Posted by djk View Post
the IRF type do not protect themselves like the Hitachi type do. Etc.
Hitachi=Renesas
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Old 9th January 2013, 12:43 PM   #1079
djk is offline djk
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Hitachi=Renesas=Semelab=Magnatec=ALFET=Exicon

(there may be others I don't know about)
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Old 29th January 2013, 09:45 PM   #1080
stenks is offline stenks  Serbia
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Can someone tell me what the value of the resistor connected in parallel to the capacitors of 10000uF with polypropylene capacitor. I tried that I read here in the forum but to no avail.
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