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Old 14th June 2009, 12:54 PM   #11
Salas is offline Salas  Greece
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Positive reg.
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Old 14th June 2009, 12:57 PM   #12
Salas is offline Salas  Greece
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Negative reg.
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Old 14th June 2009, 12:59 PM   #13
Salas is offline Salas  Greece
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The works.

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Old 14th June 2009, 01:05 PM   #14
Salas is offline Salas  Greece
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Layout. (Details and copper side etc. tomorrow).
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Old 14th June 2009, 01:19 PM   #15
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Hi Salas and Crt. The symmetrical B1 becomes mature. How about the need for heatsinks on the transistors ?
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Old 14th June 2009, 01:37 PM   #16
Salas is offline Salas  Greece
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I have calculated that with 60mA CCS per rail (68R//68R=R1) there is no danger at 10V. 60-17mA per rail times 10V for each shunt element = 430mW each. +/- 17mA runs in the audio circuits. No problem for T0-240 devices like those used.

Crt uses 3X68R in parallel, so about 100mA CCS with his 1.87V Leds, at about 11V (1.87Vf gets him a bit high here too). About 1W then.

Nothing burned (50C), but being cautious, he added those:

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Just use R1=34R, and no worries.
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Old 14th June 2009, 04:37 PM   #17
crt is offline crt  Indonesia
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YES SALAS !!! this one is SUPERB.
and has already kicked my previous symetric b-1 buffer.
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Old 14th June 2009, 05:38 PM   #18
Salas is offline Salas  Greece
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I am happy that you like it. Enjoy.
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Old 14th June 2009, 07:55 PM   #19
tinitus is offline tinitus  Europe
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slightly oftopic

Is it possible to use just pos shunt reg with original "singleend" B1

ehhh, probably not

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Old 14th June 2009, 08:12 PM   #20
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It is quite comical to see that ( after separating the"symmetrical" thread from the normal B1 thread ) questions about the normal version arise in this thread

It should work but it should be made for the right voltage of standard B1. AFAIK this was discussed in another thread:

The simplistic Salas low voltage shunt regulator

I just found out that the Search function really works effectively nowadays ! A change for the better.
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