I've worked with a similar circuit before with a flip flop IC but yours is simpler and more fun to do with transistors. Love it. I will try it later. Thank you! I always enjoy your good explanations.
@Kasyan TV The English terms most of people are searching for with this kind of circuit are "Soft Switch" "Latching Switch" "Latching Button" and "Push On Push Off" I know I have searched for and built several variants of these circuits for my own projects. Thanks for sharing. I know it can be challenging to figure out exactly what words people will be searching for in another language. It doesn't matter to me if you use my suggestions, but if you add these words to the title, description, and RU-vid key words it will really help people find this upload in the future ;) -Jake
Removed the LED and associated Resistor and the output from the Collector on the second NPN works well on digital pins on the Arduino. I did find it interesting the using a logic probe on this same output kept the output low all the time.
In electronics closed means on and open means off. The opposite of what she said in the video, so don't get confused. This can be done with a flip-flop and many other circuits with less power drain.
I am re-purposing LED lights from a broken screen LED TV and will use two 6V LED's to replace a stereo-microscope stock light where the lamp is missing. From a string of UV LED lights, I cut three LED's off to use for UV inspection. Both will use a 12V source. The latching switches I have are large and I need to see how this will fit since I have plenty of really small momentary contact switches like this from old free broken TV's. I think I can scavenge the boards stock for the other components also. I'm still debating if I want two separate latching switches or one latching (cool white LED) and the other momentary (UV). Have to see how this design fits. Thanks for sharing!
Excellent Circuit design. I want to power arduino nano and turn auto off with arduino pulse. ... Is it possible to use it with arduino. Most of the circuit doesn't work. If yes, what modifications required at the place of switch
We usually call a switch “without fixation” a momentary switch. It is only active for the moment you push it. It automatically returns to the previous state when released. Momentary switches can close when you press them (“momentary; normal open”) or when you release them (“momentary; normal closed”).
Can you tell the current direction at the switch at two stage, 1st press and 2nd press. From you video, it seem that at first press, At the Switch, current flows from left to right and at 2nd Press, current flows from right to left. Please help explain with thanks!
electronic latch switch are a savior. some special and automation circuits demand a electronic latch switch because they need command for ex: to turn off by power and when circuit come back, that switch cannot turn on again or will destroy everything. even to turn off and then turn on by the own circuit to make automation without programming too much.. i need a switch like this and this work great. 555 destroy my like with inferferences even making a shield and decoupling capacitors, and destroy a expensive work of mine because they start work by theirselfes
Has anyone figure out yet how circulation pump motor works? I know it uses gate driver in IC to drive gates in IGBT. It is 3 phase too. pump name Wilo made in sweden or something. Same shit is in those compressor heater/cooler, the fans are run by PMM thats driven by weird pwm using gate drivers and IGBT. I wan to make them run on 12 or 24v DC. Any smart person here? I could even pay if you know where to tap the pcb.
For NPN transistor, connect load at points 1.collector > +ve of LED, 2. Ground > -ve of LEC 3. CONNECT a button to base with a resistor to +ve of battery. You have made yourself an inverter / NOT gate. For PNP, connect load in series with transistor, and connect a button at base to ground. And also connect +ve supply to base via resistance. It works same as above NPN ckt. But much simpler.
There is one disadvantage in the circuit suppose you want to turn on the circuit using external transistor signal With High and Ground signal than it's not helpful for you .
why do we use two 470k resistors attached on the way to the capacitor instead of any other resistors? And what if we use another capacitor with smaller value?
Great video and explaination!! Really easy to understand. =D Oh, i have just one question: When pressed, it stays activated for ilimited time? I've found similar circuits like this one, but they can't keep the load active for more than 5 minutes. I need one that stays on forever in my project. =D
1mA when on. When off it draw (depending of capacitor used and its loses) in nA range, negligible. If used for flashlight project it's hard to imagine flashlight with current consumption so low that 1mA loss on switch can make any difference. Poor choice of wiring gauge can make loses 40x higher and nobody will blink a eye on that.
Can you please tell me how to replace the led or whatever in the output with a rellay? Push button just activate the rellay and press it again release the rellay. Is it possible with this circuit?
use the second version with tip42 (or use another bc557 instead). the first version act like a "active low" circuit, as positive stay on and negative pulse come in when you turn on (it´s amazing because can drive relay modules for arduino without arduino), and the version with tip42 are a "active high" version (when you press the button, negative stay on and positive take control). Try use diode on relay if it need and check que output version with multimeter to see the working circuit
