prprog
Member
I am testing the following circuit. It works as expected with one Cds cell. The behaviour is - when the Cds cell is cover it will activate the 4066 control line and the switch. When I add a second Cds to another 4066 control pin the issue is that I cannot set the Pot on a value that works well for 2 Cds cells. I suspect that Cds are not equal in resistance value, therefore the Potentiometer do not match the value for two Cds cells.
I try using resistor in series and in parallel to make the Cd's equal in resitance without success.
Please advice on alternative to calibrate the circuit with only one Potentiometer. The final circuit will used 9 Cds cells and 3 - 4066's.
Thanks
I try using resistor in series and in parallel to make the Cd's equal in resitance without success.
Please advice on alternative to calibrate the circuit with only one Potentiometer. The final circuit will used 9 Cds cells and 3 - 4066's.
Thanks