BeagleFaceHenry
- Nov 11, 2016
- 20
- Joined
- Nov 11, 2016
- Messages
- 20
In a past life I programmed PLCs, creating a latching circuit was easy. I'm starting to think it's not as simple with basic electronic components.
My needs are simple. I want to depress a pushbutton that will make an LED (or some flashing LEDs, or maybe a buzzer) turn on and stay on until 1 of 2 reset buttons (normally closed pushbuttons?) are depressed. Also note, this project will include 20-25 latching circuits and I'm trying to keep the project as close to $100 as possible (and of course there's a huge list of other components).
I do know that latching relays are a thing. I'm calling them Plan B. They strain the relay budget a bit.
I found THIS SCHEMATIC uses a PNP and NPN transistor but no relay. I haven't had the greatest of success getting them to work properly. Something seems off, in the 'picture', is the LED oriented the wrong way?
I've also found THIS CIRCUIT that does incorporate a relay. I haven't tried it, hopefully tonight (playoff football slowed me down).
Before I make myself crazy, can someone break down the latching circuit for me?
What's the simplest, cheapest way to make a stable, latching circuit?
Side question, where would you buy your components (aside from the obvious, Radio Shack).?
Thanks,
-j
My needs are simple. I want to depress a pushbutton that will make an LED (or some flashing LEDs, or maybe a buzzer) turn on and stay on until 1 of 2 reset buttons (normally closed pushbuttons?) are depressed. Also note, this project will include 20-25 latching circuits and I'm trying to keep the project as close to $100 as possible (and of course there's a huge list of other components).
I do know that latching relays are a thing. I'm calling them Plan B. They strain the relay budget a bit.
I found THIS SCHEMATIC uses a PNP and NPN transistor but no relay. I haven't had the greatest of success getting them to work properly. Something seems off, in the 'picture', is the LED oriented the wrong way?
I've also found THIS CIRCUIT that does incorporate a relay. I haven't tried it, hopefully tonight (playoff football slowed me down).
Before I make myself crazy, can someone break down the latching circuit for me?
What's the simplest, cheapest way to make a stable, latching circuit?
Side question, where would you buy your components (aside from the obvious, Radio Shack).?
Thanks,
-j