Modifying this simple regulator

Kevinbd · 18th December 2005, 01:46 PM

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

Kevinbd · 18th December 2005, 01:48 PM

Forgot to add the schematic! LOL

sbrads · 18th December 2005, 04:30 PM

I would put 47R or so in series with the zener to get lower noise.

alabpro · 18th December 2005, 04:54 PM

simpel regulator By alab-pro

jan.didden · 18th December 2005, 07:10 PM

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

18th December 2005, 01:46 PM	#1
Kevinbd diyAudio Member Join Date: Apr 2002 Location: Swindon, U.K.	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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18th December 2005, 04:30 PM	#3
sbrads diyAudio Member Join Date: Jun 2005 Location: Kent, UK	I would put 47R or so in series with the zener to get lower noise.