Hi
I'm having some difficulty tuning this circuit.
http://www.datasheetcatalog.org/datasheet/stmicroelectronics/2157.pdf
My power source is 23.9VDC 300mA.
I need the current output be limited @ 0,9 mA.
I've set my resistors as following.
R1 = 0,134V / 0,009A ~ 150 ohm
R2 = R1 * 10 = 1,5kohm
I will use this circuit to limit the current between two .9999 pure silver electrodes
in a container/jahr with distilled water. (making Colloidal Silver)
When I start it up the conductivity in the water is low and i'm reading 0,35mA and 22,8 Volts over the electrodes.
As silver ions are released from the anode (positive electrode) in to the water, the conductivity goes up, as does the amp.
The circuit does not limit the current to 0,9mA, after an hour or so i'm reading 3.35mA and 21,5V over the electrodes.
I'm going nuts over this "simple" circuit, so any help is much apprechiated.
Thx
Chris