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Old 24th April 2007, 01:32 AM   #1
jarthel is offline jarthel  Australia
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Join Date: Jan 2002
Location: somewhere in Australia
Default how to set output current on G Pimm's CCS circuit?

Here's the circuit:

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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Old 24th April 2007, 04:54 AM   #2
kopite is offline kopite  New Zealand
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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.
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Old 24th April 2007, 05:08 AM   #3
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