PIC Universal Programmer SchematicThe signals from a parallel port is standard TTL and being "abused" by their journey on the cable connections, they are reshaped by inverters contained in IC1. As this circuit has open collector outputs it allows easy control of three transistors T1, T2 and T3. T1 and T2 allow the application of high programming voltage VPP legs adequate support universal
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Microcontroller
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