Apr 14, 2022 · In the circuit shown, using a SRD-05VDC-SL relay module with 5V, 89.3mA on coil side and S8050 J3Y NPN transistor. What are the right sizing of flyback and zener diode?

Dec 4, 2016 · 1. Do I need a flyback diode on the solenoid? I'm guessing that the relay will protect the Arduino from flyback and noise, but it wouldn't hurt to add a diode to protect the relay. …

May 23, 2025 · Please review my circuit. I am driving a relay with an ESP32. My concern is the unexpected high voltage that comes through the coil when it is de-energized. I have placed a …

Jun 22, 2013 · What would be a good diode to prevent a NO relay from closing when reverse polarity is applied to a circuit via a drunk wiring said circuit by placing a diode in series with the …

Oct 8, 2020 · It work for months but I do not have flyback diode and one of my system failed on the long run. The relay leak current on the signal pin. Instead of reading 0 volt and 5 volt on …

Nov 7, 2024 · Diode for inductive load protection when using relay module Other Hardware General Electronics mexaal November 7, 2024, 2:42pm

Sep 21, 2020 · Any component that relies on an electromagnet or coil of wire for its operation will be inductive, that is the nature of coils of wire. Common examples are relays, solenoid and …

Mar 12, 2019 · A decent post, but the title is trying to make it sound important. Adding a relay isn’t a pro tip - it’s fundamental. Perhaps thread should be renamed - WHY DO I NEED A DIODE …

Feb 10, 2017 · The absence of a flyback diode across any relay coil driven by a transistor/mosfet switch can result in BACK-EMF damage to the switching device. The higher the relay voltage …

Aug 8, 2013 · The flyback diode must have a voltage rating no lower than the maximum supply voltage used to drive the relay, and a peak current rating no lower than the maximum relay coil …