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We bought a chip PIC programm with the corresponding circuit scheme. However, we think the circuit is poorly and inefficiently designed. Some parts of it could be replaced.
For instance, a relay is used. Maybe this mechanical device can be replaced?
Also, an inverter is used to convert 12 Volts to 24. Here, a wall adaptor with higher voltage to start with could replace the inverter all together. We have wall adaptors of 24 and 36 Volts available.
After replacing these parts, the circuit is to be layouted on a single-side PCB with through hole technologyif possible. A connector to a membrane keyboard has to be included too, to replace the keys and the LEDs.
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