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Old 26th January 2013, 11:19 AM   #331
tinitus is offline tinitus  Europe
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got it, thanks...it works
tricky, because those caps must be some kind of small wonders, since they seem to hold voltage almost indefinately

drained the caps with a reisistor....and he LED flashes nicely on power up

thought I wouldn't need a LED/res supply drain/bleeder, because of the LED in curcuit, but seems I have to mount one
will use for powr on indicator on front panel

Quote:
Originally Posted by keantoken View Post
BTW, that's a super-stylish trafo there.
ripped from a wallmount supply
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Old 27th January 2013, 10:49 AM   #332
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Neat! You turn it into gold. Is that wood? At first I thought it may be something nifty and esoteric but now I realize it's just to hold the trafo in place? For the top part it looks like you drilled holes and cut it out with a band saw? I need to learn this sort of resourcefulness.
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Old 27th January 2013, 08:10 PM   #333
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I am starting to cllect parts for the Kmultiplier I am going to use with the JG Paradise.

The Paradise uses shunt psu and draws 150mA on each positive and negative PSU, working at +-18V.

Due to availability I would like to use D45H11 power PNP instead of 2SA1930 for the positive kmultiplier.

For the negative one I have D44H11

Can I use those instead ?

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Old 27th January 2013, 08:32 PM   #334
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That transistor is a whole lot slower and I don't know about its quasisat behavior. I would have ordered some to test out but they were out of stock when I last had the chance. I tried some other outputs but the C5171/A1930 seem to be important to the specs of this design.
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Old 27th January 2013, 08:37 PM   #335
RCruz is offline RCruz  Switzerland
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Ok... I will order some

Do these need to be heatsinked ?

For the other trannies I have the BC337/327.

I read your text describing the circuit but I am having difficulties following all parts purposes.

What is the purpose of the 820u cap ? Does it get multiplied as in a darlington C multiplier ?
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Old 27th January 2013, 09:23 PM   #336
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The 820u cap is multiplied like in a C-multiplier.

The C5171/A1930 should not need a heatsink at 150mA since they are dissipating only 300mW.
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Old 27th January 2013, 10:17 PM   #337
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by keantoken View Post
Is that wood?
hey, I suppose you mean the brown trafo 'chassis' ? ... I think it's Pertinax
its hard pressed paper/glue, and very strong
I just cut with an ordinary metal handsaw, and dress with a file
edges are difficult, and splinter easily...could be better
the rest of the box is scrapped digital 'something', modified a bit, and some plywood
it's really way too much work for what it is, but whatever, its great fun
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Old 28th January 2013, 02:38 PM   #338
tinitus is offline tinitus  Europe
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and got the Kmultiplier mounted
and since its a topic/thread with few pictures, I give you some
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Old 28th January 2013, 03:30 PM   #339
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Thanks for the pictures. I can't imagine using a hand saw and getting something to fit together as a box. If I knew of a way of a way to cut wood well enough for boxes I'd have my own sealed speakers probably.
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Old 28th January 2013, 04:38 PM   #340
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Nice work tinitus
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