How to build a latching relay

[SPF4834]

I have several SPDT relays. Is there a way I can use these to build a latching relay. I am using a momentary rf transceiver to send out a pulse of 500 mamps. I need the relay to pull in and stay until I send another pulse to open the circuit. Any help along with a schematic would be helpful

 

[dr pepper]

This do the trick?, it can also be used on a dc relay operating from a battery, its the second drawing.

https://electronics.stackexchange.com/questions/61437/how-to-wire-this-latching-relay

Welcome to the forum.

 

[crutschow]

The op wants an alternate action latching relay circuit toggled by a single pulse. Those tend to be a somewhat complex circuit with a standard relay. The easiest is probably to use a triggered Flip-Flop to control the relay.

What is the coil voltage and coil current of the relay?

 

[dr pepper]

My bad.
Some of these circuits are particular about the relays, but here goes:

https://www.emil.matei.ro/onof2.php

 

[eTech]

I have several SPDT relays. Is there a way I can use these to build a latching relay. I am using a momentary rf transceiver to send out a pulse of 500 mamps. I need the relay to pull in and stay until I send another pulse to open the circuit. Any help along with a schematic would be helpful

Hi

A standard relay with a single SPDT contact is not enough contacts to use relays alone, unless you parallel relays to increase the number of contacts, and that itself raises complexity. You need at least one contact to provide feedback, one contact to latch the relay, and one contact (or more) to drive the load. Simpler to use solid state circuitry to drive the relay. Do you have a part number for the relay and input control voltage requirements?

eT

 

[Robert M Harper]

Here is a weird one. I have a board design (in production) it uses the older 1 Form C type relay with the 8 pins the last to for (NO). As you know the coil runs the entire time the PTT or device is activated. I was looing at the Latching relays but how to I get the current input to pulse? Normally it switches / rest sets when the PTT or switch switches off (by grounding) the other two pins? I hope I made sense...

Thanks

 

[alec_t]

I hope I made sense...

Sorry, no. Can you post a schematic?
BTW, you've hijacked someone else's thread.