Soft Latching Power Switch ON / OFF Circuit

Introduction: Soft Latching Power Switch ON / OFF Circuit

About: Ideas Into Reality !

Simplest Soft Latching Power Push Switch ON/OFF Circuit

This soft Latching Power Switch circuit design contain only two transistor, resistors and momentary push button switches,so this is one of the cheapest way to get your work done

You can use any Transistor in this circuit, just it will need to find proper ressistance value accordingly, cheap don't always worst this circuit only consumes 1.8 Micro Amperes at off state

You can really improve this circuit by replacing mosfet's instead of transistors

Step 1: You Will Need

1. 1 kilo ohm ressistors *2
2. bc547 and bc557
3. Two push buttons
4. Protoboard

Step 2: Circuit Diagram

Follow this circuit Diagram

Step 3: Watch Full Tutorial

1 Person Made This Project!

Recommendations

  • Mason Jar Speed Challenge

    Mason Jar Speed Challenge
  • Bikes Challenge

    Bikes Challenge
  • Remix Contest

    Remix Contest

17 Discussions

0
Rpape871
Rpape871

Question 10 months ago on Introduction

If I were to use MOSFETs, would it still need to be npn and pnp? This is real informative and I appreciate what you do. What I'm trying to do is create something called a radio button circuit where I can push one button to turn on an output then push another button to turn on a different output and turn the previous output off. Can this type of circuit do this? I've been searching the internet but haven't found what I need. There are a lot of 2 button latch circuits but none with 4,5 or 6 like I need. Can you point me in the right direction? It would be greatly appreciated. Thank you for any help.

0
josephchrzempiec
josephchrzempiec

4 years ago

Helloin your specs you have the 2 transistors and 2 of the 1k resistors But in your Circuit Diagram It haves all that and a 100ohms resistor. What is that for?

0
allserwis
allserwis

Reply 11 months ago

This 100 Ohm resistor is for limit current on LED, nothing to do witch switching circuit.

0
HamidM38
HamidM38

2 years ago

Merci pour votre aide

0
SandeepT23
SandeepT23

3 years ago

Im a very beginner to electronics.. Just a simple question.. What will happen if you hold the button for few seconds when the LED is off (or in on state also).. Will it toggles the state quickly?? If so how can we avoid that even if we holds the line for few seconds..

0
TecDroiD
TecDroiD

3 years ago

nice work. would this work for 36v, too or would i need other transistors?
btw. when i want to use a microcontroller to switch this thing off, i suppose, i should use a third transistor to switch the npn base to ground? (especially when using 36V)..

0
Doc Darkness
Doc Darkness

3 years ago

well explained and well executed thank you for posting

0
LukaM5
LukaM5

Reply 3 years ago

no, it was everycircuit http://everycircuit.com/app/ the free version has a limit of 5 components though, to it's pretty useless.

0
mirws
mirws

3 years ago

How to use it on 3v3 system?

0
neumanngregor

Frend, what program do you use for the circuit simulation, its amazing ?

0
henkoschoeman
henkoschoeman

5 years ago

how wil you build circuit using only 1 button

0
BeachsideHank

You have fully documented your build, and shown the theory of operation in a clear, understandable and intelligent manner, as well as demonstrating possible alternative uses; this is the way of a good educator, well done!