Dynomotion Forum

Hi, Tom. Thanks for the support, all excellent! My problem was that I did not supply power to the KFlop :)) and the output stage of the optocoupler passed all the current to KFlop. I checked - the optocoupler works fine with a current of 20mA, since the CTR is> 50%. But your circuit is better, there...

Tom, thanks!
I`ll apply your advice soon. It takes a little time, which is never enough )
I'll write soon.

Hi, Tom. I know I'm wrong somewhere, but I don't know where. Made the board 6N137, it works well with high impedance multimeter input, but does not work with KFlop board. Here is the schematic (111.jpg) 111.jpg OK, I didn't know the board had pull-down resistors installed :)) I made the second board...

Hi, friends. I made two optocoupler boards, the first using 6N137, the second using PC817, both 16 channel. Pins KFlop as IN. I want to use I/O pins JP4 and JP6 (LVTTL, 3.3V), but resistors 150 Ohm reduces the voltage on the input to a logical 0. Can programmatically disable these pull-down resistor...