Hi I am 4ever a noob.
Here's my question I am trying to make a touch switch that controls an optocoupler. I have it working but I am worried that I may be exceeding the optocoupler's max ratings (40ma). I was wondering if someone could let me know how, with the following circuit, I can make sure that the current feeding into the LED side of the Vactrol does not exceed 40mA.
+V = 4.5V
Schematic:
I really like the results I'm getting from the Vactrol now. Using a resistance range from +V to the Vac of 100 to 22K. What I'm worried about is that 100ohms will result in too high current:
V=IR
4.5 = I*100
I = .045A
How can I get that down to 40mA but maintain the range I am seeing now?
Thanks for any advice.
Here's my question I am trying to make a touch switch that controls an optocoupler. I have it working but I am worried that I may be exceeding the optocoupler's max ratings (40ma). I was wondering if someone could let me know how, with the following circuit, I can make sure that the current feeding into the LED side of the Vactrol does not exceed 40mA.
+V = 4.5V
Schematic:
I really like the results I'm getting from the Vactrol now. Using a resistance range from +V to the Vac of 100 to 22K. What I'm worried about is that 100ohms will result in too high current:
V=IR
4.5 = I*100
I = .045A
How can I get that down to 40mA but maintain the range I am seeing now?
Thanks for any advice.