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Hello Brian, When i added 100ohms on the output of U1 and U2 it ruined the functionality, So i added 100 ohms in series to C10 is it a good alternative?

regarding the  1N750 zenner diode.As you can see below we have 1.8mA current flowing threw it.

Isnt it too little current for this zenner diode to function properly (having 4.7V reversed biased)?

Thanks.

[URL unfurl="true"]https://www.mouser.co.il/datasheet/2/268/1N746A_1_1N759A_1_2c1N4370A_1_1N4372A_1-3442192.pdf[/URL]

[ATTACH=full]194975[/ATTACH]

[ATTACH=full]194972[/ATTACH]

[ATTACH=full]194974[/ATTACH]