double coil latching relay + momentary switch.

[arjespen]

Hey.
I'm trying to figure out a circuit to control a double coil latching relay (NEC ea2-5ntj) with a momentary footswitch.
I've looked over some flip flop circuits, but haven't found anything that doesn't keep a constant current through one of the relay coils.

I would like to keep the components to a minimum of a few transistors and resistors.
I would also like to have two diodes showing which "channel" is on.

Any help?

[blackieNYC]

http://www.geofex.com
This will help. Elsewhere in Geofex are other relay circuits. Search relays within.

[arjespen]

Thanks.
I did look through that site, but only found the ony circuit, using a hex inverter. I'd prefer it if I could find something that simply used a couple of transistors instead.

[R.G.]

So would I. 

[blackieNYC]

How about "Boss/Ibanez" switching with relays instead of FETs? Lotta parts
Alsohttps://www.electronics-tutorials.ws/blog/relay-switch-circuit.html

[GibsonGM]

Probably something like an H bridge is required.  The hex inverter is easier, may be the simplest way to do it.

[R.G.]

I was being whimsically rehetorical. 

[Rixen]

the lowest part count is to use an 8 pin micro, such as an attiny.
1x Regulator, 1x supply decoupling cap, 1x micro, 2x protection diodes, relay.

and a few lines of code.

[R.G.]

I keep telling people that, and the universal response is " AAAAAAAAAGGGGG!! Write code?? Program a chip?? AAAAAAAGGHH!!!"



This kind of thing is rapldly forming up as a Great Divide in how people might do DIY.

The difficulty is no greater than learning to solder or do decent cable lacing with waxed nylon tape.

[DDD]

What about a simple capacitor (Alu electro) in series with relay coil? The higher its capacitance, the longer current pulse that should be long enough to force relay to trigger.
Of course, there's couple resistors are needed as well, and maybe couple 1n4148 diodes.
Anyway, it's the simpliest circuitry for sure.

[Rixen]

..and of course a micro can drive your LED's to indicate which state the relay (should) be in..