Mechanical Switches are Obsolete! Switch to a Latch Circuit! EB#53
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Rating: 4.5; Vote: 2
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!
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
That's: I once found and used an interesting variation that solely used one momentary switch, one DPDT latching relay, and a couple of resistors, caps and diodes. Basically cross wiring the relay and using the cap voltage to provide the voltage spike to flip the relay over. It had issues if not switched in a long time as the caps slowly drained due to parasitics. But I thought it clever. Your version though is cheaper and likely more relaible (and allows more current. I like it! Date: 2022-07-10
