Building a symmetrical psu B1 buffer - Page 2

Salas · 14th June 2009, 01:54 PM

Positive reg.

Salas · 14th June 2009, 01:57 PM

Negative reg.

Salas · 14th June 2009, 01:59 PM

The works.

Salas · 14th June 2009, 02:05 PM

Layout. (Details and copper side etc. tomorrow).

jean-paul · 14th June 2009, 02:19 PM

Hi Salas and Crt. The symmetrical B1 becomes mature. How about the need for heatsinks on the transistors ?

Salas · 14th June 2009, 02:37 PM

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:

Just use R1=34R, and no worries.

crt · 14th June 2009, 05:37 PM

YES SALAS !!! this one is SUPERB.

and has already kicked my previous symetric b-1 buffer.

Salas · 14th June 2009, 06:38 PM

I am happy that you like it. Enjoy.

tinitus · 14th June 2009, 08:55 PM

slightly oftopic

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

ehhh, probably not

jean-paul · 14th June 2009, 09:12 PM

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.

14th June 2009, 02:19 PM	#15
jean-paul diyAudio Moderator Emeritus Join Date: Sep 2002 Location: The Netherlands	Hi Salas and Crt. The symmetrical B1 becomes mature. How about the need for heatsinks on the transistors ? __________________ It's only audio

14th June 2009, 09:12 PM	#20
jean-paul diyAudio Moderator Emeritus Join Date: Sep 2002 Location: The Netherlands	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. __________________ It's only audio

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14th June 2009, 01:59 PM	#13
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	The works.

14th June 2009, 02:37 PM	#16
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	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: Just use R1=34R, and no worries.

14th June 2009, 05:37 PM	#17
crt diyAudio Member Join Date: Apr 2007	YES SALAS !!! this one is SUPERB. and has already kicked my previous symetric b-1 buffer.

14th June 2009, 06:38 PM	#18
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	I am happy that you like it. Enjoy.

14th June 2009, 08:55 PM	#19
tinitus diyAudio Moderator Join Date: Nov 2005	slightly oftopic Is it possible to use just pos shunt reg with original "singleend" B1 ehhh, probably not

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