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Old 4th May 2010, 12:52 PM   #491
ak4396 is offline ak4396  Germany
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My last idea.

In my mind it is the way to hold the Voltage constant like we see it in the simple schematic form Mr. Pass.

Or not?
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Old 4th May 2010, 01:19 PM   #492
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The opto led has to monitor the voltage across R14+R8.
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Old 4th May 2010, 02:23 PM   #493
ak4396 is offline ak4396  Germany
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Than you can do so.
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Old 4th May 2010, 03:25 PM   #494
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Quote:
Originally Posted by ak4396 View Post
Than you can do so.
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Old 4th May 2010, 06:44 PM   #495
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I would stick a nice big cap across Q2

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Old 4th May 2010, 07:07 PM   #496
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baad Papa , baaad!

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Old 4th May 2010, 11:53 PM   #497
eyoung is offline eyoung  United States
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What about the tl431 instead of opto whatever???

I just dont have a good tl431 spice model that works,

Just a thought, El
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Old 5th May 2010, 12:36 AM   #498
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Works fine, but you have to adjust it by hand after the
circuit has warmed up.
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Old 5th May 2010, 06:37 AM   #499
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TL431 spice model.
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Old 2nd June 2010, 08:32 PM   #500
generg is offline generg  Germany
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hi everybody,

maybe I just heard half of the heaven J2 promises....

I got tea-bags semisouth and put them together with the semisouth I got from magura in a BA-1. I left the IRF240 on the negative side doing the job as a current source and ,like Nelson would say, not to spoil the performance of the output stage by the gainstage I changed the IRF610 by a semisouth R100.

Wonderful performance, more details, voices totally different and subtle.

So I can wait for J2 in any version much better!
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