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<blockquote data-quote="Hugocz" data-source="post: 1136161" data-attributes="member: 415382">Interestingly. You have it differently than me.1) Input pulses from egis sensors:If the sensor output is 0V, the diode in the optocoupler lights up. That is right.But if the output from the sensor is 24V, only the 1N4148 diode prevents the opposite polarity from connecting to the optocoupler. Is she fast enough? Won't short pulses of 19V (24V - 5V) be received up to the optocoupler? Isn't it a risk of damaging the optocoupler? I think the resistor network that is in the original EPS-103 wiring and that I used is safer.2) Not using B pulses reduces the physical resolution of the position. I don't know if it is already below the resolution of the EGIS mechanical design. Perhaps the dead run of the mechanical parts is greater than the accuracy of the additional pulses. But EGIS uses them for a reason. Would using them be an unnecessary complication for you?3) Use of NAND Schmitt trigger is correct for origin switches. But for AZ / EL impulses, they are perhaps redundant. But there are four in the HEF4093B circuit. I understand their use. The Raspberry Pi has this feature on its GPIOs. It can be activated by software. That's why I didn't use an external circuit.4) Does the L7805 stabilizer not heat up? Converting from 24V to 5V is quite a leap. Can't 5V be output from the positioner? :-)I hope you don't take my comments as slander of a competitor. Discussion is important. If only someone could break down my schematic. I would definitely learn a lot.</blockquote>

[QUOTE="Hugocz, post: 1136161, member: 415382"] Interestingly. You have it differently than me. 1) Input pulses from egis sensors: If the sensor output is 0V, the diode in the optocoupler lights up. That is right. But if the output from the sensor is 24V, only the 1N4148 diode prevents the opposite polarity from connecting to the optocoupler. Is she fast enough? Won't short pulses of 19V (24V - 5V) be received up to the optocoupler? Isn't it a risk of damaging the optocoupler? I think the resistor network that is in the original EPS-103 wiring and that I used is safer. 2) Not using B pulses reduces the physical resolution of the position. I don't know if it is already below the resolution of the EGIS mechanical design. Perhaps the dead run of the mechanical parts is greater than the accuracy of the additional pulses. But EGIS uses them for a reason. Would using them be an unnecessary complication for you? 3) Use of NAND Schmitt trigger is correct for origin switches. But for AZ / EL impulses, they are perhaps redundant. But there are four in the HEF4093B circuit. I understand their use. The Raspberry Pi has this feature on its GPIOs. It can be activated by software. That's why I didn't use an external circuit. 4) Does the L7805 stabilizer not heat up? Converting from 24V to 5V is quite a leap. Can't 5V be output from the positioner? :-) I hope you don't take my comments as slander of a competitor. Discussion is important. If only someone could break down my schematic. I would definitely learn a lot. [/QUOTE]

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