2022-07-10

[public] 411K views, 20.2K likes, dislikes audio only

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You can get the shown components here: (affiliate links):

SR Latch IC (74LS279): https://s.click.aliexpress.com/e/_DCvoI1Z

NOR Gate IC (74HC02): https://s.click.aliexpress.com/e/_DENPL71

BC547 NPN BJT: https://s.click.aliexpress.com/e/_Dey4ikR

IRF5210 MOSFET: https://s.click.aliexpress.com/e/_DFNd8oJ

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In this episode of electronics basics we will be having a closer look at latch circuits. As the name suggests, a latch circuit activates/deactivates a switching element through one Set/Reset voltage input pulse and keeps it in that state. Because of that latch circuit are everywhere. They are part of other circuits or come in the form of power switches or latching relays. Let's learn all about them and build one!

Websites which were shown/used in the video:

https://randomnerdtutorials.com/latching-power-switch-circuit-auto-power-off-circuit-esp32-esp8266-arduino/

http://www.mosaic-industries.com/embedded-systems/microcontroller-projects/electronic-circuits/push-button-switch-turn-on/latching-toggle-power-switch

http://www.learningaboutelectronics.com/Articles/Latch-circuit-with-transistors.php

https://www.ti.com/lit/ds/symlink/sn74ls279a.pdf?ts=1655808263577&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FSN74LS279A

https://www.youtube.com/watch?v=Foc9R0dC2iI

https://en.wikibooks.org/wiki/Digital_Circuits/Latches#:~:text=Since%20the%20gated%20SR%20latch,inverse%20of%20the%20remaining%20input.

https://www.mouser.de/ProductDetail/E-Switch/ST5DP104T2C1?qs=aP1CjGhiNiEOL7BFmWVZ8Q%3D%3D

https://www.mouser.de/ProductDetail/TE-Connectivity-PB/1-1825137-6?qs=GQ3BsEl46pk8vicKht%252BRUg%3D%3D

https://www.mouser.de/ProductDetail/Infineon-IR/IRF5210PBF?qs=9%252BKlkBgLFf3S3YiL4ijtLg%3D%3D

https://www.google.com/search?q=latch+circuit&tbm=isch&ved=2ahUKEwiags2xhc34AhXuwwIHHevrAuwQ2-cCegQIABAA

Thanks to Skillshare for sponsoring this video.

0:00 What/Why Latch circuit?

1:33 Intro

2:33 Logic Gate Latch

5:31 Latching Relay

6:22 Toggle On/Off Power Latch circuit

8:57 Set/Reset Latch circuit

10:01 Verdict