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Timeline for Why is Vdd connected to GND?

Current License: CC BY-SA 4.0

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Feb 1 at 3:18 comment added shafeeq @Justme, Let me try to understand the working of the circuit. The C2, D2, D3 and D4 forms the power supply for the microcontroller. ie. the varying voltage between +15v and -15v in the RTS (pin 7) of RS232 will be rectified by D3 and D4, the C2 will be act as a filter capacitor and zener diode as a voltage regulator. Is my understanding correct? Could you add the use of other components to your answer?
Jan 31 at 8:08 comment added Justme @shafeeq Yes I had off-by one typos, fixed.
Jan 31 at 8:07 history edited Justme CC BY-SA 4.0
edited body
Jan 31 at 8:03 comment added shafeeq @Justme Look like the capacitor C3 is typo. You mean C2?
Jan 31 at 6:23 vote accept shafeeq
Jan 30 at 20:10 comment added Sparky256 I up voted your detailed and correct answer.
Jan 30 at 19:25 history answered Justme CC BY-SA 4.0