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Old 18th December 2005, 01:46 PM   #1
Kevinbd is offline Kevinbd  United Kingdom
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Default Modifying this simple regulator

Hello,

I have attached an schematic of a regulator circuit for low level circuits. I have actaully seen on diyaudio circuits similiar with better performance using current sources and remote sensing etc but I cannot for the life of me find them. Damn.

The circuit basically just uses a 10v Zener feed from a load resistor. This could be easy replaced by a CCS and a LM4040 or LM4050. Also an RC filter could be added to further reduce noise. It is current limited to arround 35mA. Personally, I do not like the pass transistor being in common emitter mode (due to poorer transient repronse compared with emitter follower) but I think this will bugger up the protection circuit which is important.

Was thinking of replacing R6 with a J50X current source feed by a RC filter to drop the voltage also. (sure I have seen a design like this but can't find it)

A bootstrap capacitor could also be added.

The circuit passes 1mA through R3 4K7 to drive the pass transistor. I wonder whether this could be replaced by a J50* current source also.

Help apppreciatted

Kevin
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Old 18th December 2005, 01:48 PM   #2
Kevinbd is offline Kevinbd  United Kingdom
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Forgot to add the schematic! LOL
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Old 18th December 2005, 04:30 PM   #3
sbrads is offline sbrads  United Kingdom
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I would put 47R or so in series with the zener to get lower noise.
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Old 18th December 2005, 04:54 PM   #4
alabpro is offline alabpro  Thailand
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simpel regulator By alab-pro
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File Type: pdf simple supply.pdf (20.6 KB, 110 views)
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Old 18th December 2005, 07:10 PM   #5
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Quote:
Originally posted by Kevinbd
Forgot to add the schematic! LOL

If the voltages are enough, feeding the reference string from the output rather than the input is an improvement that comes free....

Jan Didden
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