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Old 28th April 2012, 11:55 PM   #401
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Workarounds are my speciality (:
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Old 28th April 2012, 11:57 PM   #402
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I will use BF246A to supply the Led.
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Old 29th April 2012, 12:09 AM   #403
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Quote:
Originally Posted by Joachim Gerhard View Post
I will use BF246A to supply the Led.
OK this one is from 30-80 mA, so may be that 2 k trimmer could not reach enough Ugs to go down to 2 mA. Than add serial resistor to set Id=2 mA

Ideally would be LED current equal Sziklai current, that means both CCS BJTs same current, same Ube characteristic, electricaly plus thermally (coupled together) makes CCS very stable.

P.S. BF246A Uds should be around 10 V for good regulation and AC suppression, if Rgs drops too much to get 2 mA, than lower 12 k to 10 k or less just to maintain Uds=10 Vmin

Last edited by Lazy Cat; 29th April 2012 at 12:22 AM.
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Old 29th April 2012, 12:11 AM   #404
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Workarounds are my speciality (:
Jack of all trades, master ... joke

Yes I see you're very capable and most handy, congratulations
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Old 29th April 2012, 12:20 AM   #405
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My nickname is Joke by the way. Only my oldest friends know that.
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Old 29th April 2012, 12:35 AM   #406
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It works without problem. 1,3mA in both channels right away.
Thats it for today.
Was fun, good night.
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Old 29th April 2012, 12:35 AM   #407
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My nickname is Joke by the way. Only my oldest friends know that.
Thanks, the name's Lucky

Good night

Last edited by Lazy Cat; 29th April 2012 at 12:49 AM.
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Old 29th April 2012, 12:39 PM   #408
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Most components are on board. Some more wiring has to be done.
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Old 29th April 2012, 02:15 PM   #409
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Quote:
Originally Posted by Joachim Gerhard View Post
Most components are on board. Some more wiring has to be done.
Hi Gerhard

Three amp stages only (input, output, CCS) in TSSA but all black of small signal transistors on your PCBs. 6800 uF feedback elcos

Niceeee
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Old 29th April 2012, 02:50 PM   #410
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Yes, i had them from another project, does not hurt.
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