Tube DIY Asylum

The reason I removed my web pages

210.84.51.84

In Reply to: RE: A last attempt posted by johs on November 02, 2009 at 02:54:36

I couldn't be bothered with the argy bargy of trying to support these designs any longer.

BTW the CCS isn't my design, I believe it is due to the late great John Linsley Hood. To make it work you have to watch the Hfe of the transistors - the collector current of the amplifying transistor (Q1) must be well above the pass current divided by the Hfe of the pass transistor (Q2) otherwise Q2 will enter base starvation. If the Hfes of the two transistors are high enough that design of current source can achieve dynamic impedance well over 100k and is very quiet and stable.

I personally dislike the TL431 and will do anything to avoid using it.

Mark Kelly

Follow Ups:

RE: The reason I removed my web pages - johs 11:07:06 11/03/09 (0)

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