wayne_
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I want to use some form of controller [program] to vary the resistance of a resistor which is physical or even virtual;
The resistance is one that changes from a fixed large base resistor of 150 M Ohm down to 1.5 M Ohm less then after 12 hours up to + 151.5 M Ohms
I have had advice that a LM13700 transconductance amplifier may make a virtual resistor.
It does a good job... I can use a small 10 to 100 Ohm variable R as a control.
I need to automate however during a specified time of 24 hours the increment and decrement of that resistance.
[The small virtual 10 -100 Ohm controlling resistance].
Any one suggesting some creative answer?
The resistance is one that changes from a fixed large base resistor of 150 M Ohm down to 1.5 M Ohm less then after 12 hours up to + 151.5 M Ohms
I have had advice that a LM13700 transconductance amplifier may make a virtual resistor.
It does a good job... I can use a small 10 to 100 Ohm variable R as a control.
I need to automate however during a specified time of 24 hours the increment and decrement of that resistance.
[The small virtual 10 -100 Ohm controlling resistance].
Any one suggesting some creative answer?