The Two Transistor Latch
The Two Transistor Latch is a classic circuit you should know. A signal at the base of Q1(NPN) causes it to conduct, and since it is connected to Q2(PNP) through it's base, it begins to conduct as well and the circuit is in the on state. A feedback loop from the collector of Q2 to the base of Q1 keeps the current flowing even when the switch is open. https://www.pcbway.com/ Get 5 boards in about a week for $22! Please help support this channel at NO COST TO YOU. If you shop on Amazon, please use this link: https://amzn.to/3706t6c I will get a small commission and it costs you nothing. Learnelectronics Merchandise: Yes!! I now have merch: https://teespring.com/stores/learnele... Electronics themed T-Shirts! ---------------------------------------------------------------------------------------------------------------- HEY YOU ABOUT TO POST SOMETHING STUPID: Yes, I know my hands are large/fat. It's because of a heart condition I suffer from called Congestive Heart Failure. Here's a link to some information about CHF: https://cle.clinic/2TdS2Ux One of the symptoms is that it causes fluid retention, mostly in the hands, feet/ankles, and face.. -------------------------------------------------------------------------------------------------------------------- Amazon Store: If you are shopping for electronic components, test gear or consumables please consider visiting my Amazon shop @ amazon.com/shop/learnelectronics Please check out www.patreon.com/learnelectronics and pledge a dollar if you can. It will go a long way to keeping the channel alive. It costs a bit of money to buy all the items and produce these videos. Your help is appreciated. --------------------------------------------------------------------------------------------------------------------- Donation: Or....if you'd like to send a one-time donation you can use this link: paypal.me/learnelectronics --------------------------------------------------------------------------------------------------------------------- Gear I use: DMM: Owon B33+ - https://amzn.to/3qQgH20 Power Supply: Matrix 3206 - https://amzn.to/37C0fL9 Portable O'scope: YEAPOOK ADS1013D - https://amzn.to/2ZG4G3x Bench O'Scope:Hantek DSO2D15 https://amzn.to/3ir307N Soldering Station - KSGER T12 - https://amzn.to/2NuNdby Multimeter leads: Probemaster - https://amzn.to/2ZJ0BLK
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