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How to make a servo tester with a 555 timer IC | JLCPCB

In this project, I'll make a small circuit capable of controlling a servo, it is a servo tester made out of a 555 timer IC.
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Voltage Rating Tester for Zener Diode

The circuit has been constructed to test and measure the voltage rating of zener diodes. To be able to test the voltage rating of a zener diode up to 50 VDC, a small transformer and a single 555 timer ...