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When the design says 4.9v zener diode that is all I would put. The more complicated an alternative you try the more things that can go wrong.

A silicon diode is not the same as a zener diode, and cannot be used to replace a zener, with reasonable expectation that the circuit will continue to operate as designed.

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Q: Is it can say as a 4.9v zener diode If you connect seven 0.7v silicon diodes in forward bias in series?
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