Posts made by Pablo

In my opinion, you are missing here supply voltage, which you need to limit current to protect the transistor of pulse counter with Rc. Usually this value would be limit on maximum ratings 50mA. I would have liked to 10mA and on examply 24V is this value 2400 Ohm. In datasheet for Neuron is value for Input resistance 6200R and minimum voltage is 5V.
This results in the value of the minimum current 806uA. Sum of input resistance and Rc si now 8600 Ohm and with 24V you have 2,7mA for digital input. And that is enough for operation of transistor S0 output and Neuron input. Simply use pullup resistor Rc 2200R or something in this range. You will avoid the limit values like 10k or 20k due to speeds and low values due working supply voltage and kill transistor of course.

And what's the value of the pullup resistor Rc?

Hi,

of course that limit is 36V, if linearity is guaranteed, because your devices are typical for these board.

We can try measuring on board. When you have 5V behind 7805, we can exclude a mistake on supply.

If you have voltmeter with measuring duty cycle, try it on inputs and ouptputs of optrons, whether it working corectly.

And finally, when there is on on fifth pin of the operation amplifier (IC 1;3;5;7) half of the configured output voltage, it is OK.

Hi,
in that case a have a question about sources. What is your power supply for the outputs.
And are these connected individually, or in common. I have idea, that after some time the power supply exeeds the limit of the AO... Maybe?
Second question, what did you connect to the outputs? You are talking about heating.
Maybe better link to technical docummentation of the devices.

And you had from the beginning correct wiring?

Because the output should not be higher than the voltage value of 10.5V.

From what you describe is a board defective.