how to set output current on G Pimm's CCS circuit?

jarthel · 24th April 2007, 01:32 AM

Here's the circuit: http://img340.imageshack.us/my.php?i...biasccsfs9.gif

I have a feeling it is measured across R1. Is this right

Also, do I need to have a load? I am thinking of just the transformer -> rectifier -> choke -> cap -> CCS circuit. nothing else after it.

Do I need to connect the negative terminal of CCS circuit anywhere if it's okay if there no load?

thank you.

kopite · 24th April 2007, 04:54 AM

The voltage across r1 is approx 14 volts. so using ohms law you can calculate the resisitir for r1. If you need to drawer 20ma you will use a 680 ohm resistor. Fine tune the current setting with the pot.

Looneytunes · 24th April 2007, 05:08 AM

Jarthel,

You have mail.

Cheers,
Looney

24th April 2007, 01:32 AM	#1
jarthel diyAudio Member Join Date: Jan 2002 Location: somewhere in Australia	how to set output current on G Pimm's CCS circuit? Here's the circuit: http://img340.imageshack.us/my.php?i...biasccsfs9.gif I have a feeling it is measured across R1. Is this right Also, do I need to have a load? I am thinking of just the transformer -> rectifier -> choke -> cap -> CCS circuit. nothing else after it. Do I need to connect the negative terminal of CCS circuit anywhere if it's okay if there no load? thank you.

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24th April 2007, 04:54 AM	#2
kopite diyAudio Member Join Date: May 2005 Location: NZ	The voltage across r1 is approx 14 volts. so using ohms law you can calculate the resisitir for r1. If you need to drawer 20ma you will use a 680 ohm resistor. Fine tune the current setting with the pot.

24th April 2007, 05:08 AM	#3
Looneytunes diyAudio Member Join Date: Oct 2005	Jarthel, You have mail. Cheers, Looney

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