Actually I want to make a toggling switch with latch which drives the relay without using any ICs... How can I do this ?

 

You can make the latch with relays or other discreet components, as was done before ICs were developed.

 

Do a search on the web for "latching relays". There are lots of them. Use a pushbutton switch or similar to provide an appropriate pulse to the relay. Each time the pulse is applied to the relay it will switch to one of its two stable states.

 

Thanks for quick reply, but what I want to kindly ask is, Let's not include that relay... I just want to on and off a LED using single push switch. At the very first the LED is OFF. When I press the switch the LED should ON and on next push It should OFF. and circuit should not use any ICs and simple too.

 

Sounds like what you want is an "alternate action" pushbutton. The first push sets it to one state and the next push sets it back to the other state. Same thing. Just do a search for "alternate action bushbutton"

 

Sounds like what you want is an "alternate action" pushbutton. The first push sets it to one state and the next push sets it back to the other state. Same thing. Just do a search for "alternate action bushbutton"

If I'm correct... It's electromechanical technique but I need to give it pulse for ON and OFF.

 

I confess. I'm mystified. It's either a mechanical switch or an electronic latch. We're back to using an IC latch. Something has to store the ON-OFF state.

 

Can't we do this without using ICs... help me...

 

Why can't you use an alternate action pushbutton switch, as recommended by john-campbell?
If you need it to be actuated by a pulse, and you don't want to use ICs, can you use transistors?

 

I think the OP missed john's "alternate action bushbutton" recommendation. (what's a bushbutton? )

http://www.radioshack.com/search/index.jsp?kwCatId=&kw=push%20on-push%20off&origkw=push%20on-push%20off&sr=1

Ken

 

(what's a bushbutton? )

Ken

I wondered the same thing. A Google image search brings up some fairly nasty George Bush lapel buttons.

 

You guys are a tough crowd. I'll be more careful in the future.

 

Many years ago I did a alternative push button ON/OFF relay circuit to replace one of those mechanical switches used on a table lamp.

The only limitation is not to use any latching relay or capacitor or transistors and the circuit should be able to work with either AC or DC coil voltage.

I can't remember the details now but I did remember I have to use more than three relays.

 

Why can't you use an alternate action pushbutton switch, as recommended by john-campbell?
If you need it to be actuated by a pulse, and you don't want to use ICs, can you use transistors?

Yes, We can use transistors...

 

Yes, We can use transistors...

Is your input a switch, a pulse, or...

 

Is your input a switch, a pulse, or...

It's a pulse.

 

What is the source of the pulse? Voltage? Polarity? Pulse width?

Ken

 

What is the source of the pulse? Voltage? Polarity? Pulse width?

Ken

Whatever you want but it should be pulse.

 

Whatever you want but it should be pulse.

Now that's license. Since the pulse can be anything...I choose "momentary, dry-contact switch closure"!

Not my circuit, but I always thought it was a novel idea.

Ken

 

Now that's license. Since the pulse can be anything...I choose "momentary, dry-contact switch closure"!

Not my circuit, but I always thought it was a novel idea.

Ken

You're with the license but It's prohibited to use such mechanical control... Let's say the pulse is of electrical type... and this circuit should behave as the JK Latch... but without using ICs... can be used transistors and passive frens....