I'll preface this request by saying I've minimal knowledge of circuit design and things of that nature. I do know how a relay works...

I'm working on a latching circuit using a momentary switch. Below is a diagram of what I have found so far to create the circuit (Latched On/Off Output Using a Single Momentary Negative Pulse - Positive Output), but in my case will be adding another relay on the output to change the output state from positive to negative.



What I want to know is - how can this circuit be made with equipment that is physically smaller, but yet still cost effective/easy/etc. ? Smaller relays? miniature PLC?

This will be utilized to control the electric overdrive and torque converter lock functions on a truck transmission. (I do not know the current draw for the output circuit).

[Edited on November 9, 2013 at 9:10 AM. Reason : -]

11/9/2013 9:09:42 AM

http://www.ebay.com/itm/Bistable-Latching-DPDT-8-Amp-Power-Relay-Module-DC12V-Coil-Tyco-RT424F12-/131040691212

?

11/9/2013 12:29:15 PM

If I interpret the datasheet correctly, that relay requires separate inputs to switch states on the relay - and it's controlling (2) separate outputs as well-

http://www.audiowind.com/pdf/D-151.pdf

- I don't think that's what I'm after

BUT - that physical size and 'arrangement' IS the type of thing. I'll dig deeper to see if that vendor offers other setups

11/9/2013 1:08:21 PM

Just screw it and use this...

11/9/2013 8:23:50 PM

use redstones...

11/10/2013 1:18:14 AM

http://www.pac-audio.com/PACProductData/TR7/1_Instructions/tr-7_instructions_010505.pdf

$17 on ebay, looks to have a variety of functions-

11/11/2013 7:45:25 AM

It might not be any cheaper, but if you want to use local Radio Shack parts you could use this
http://todbot.com/blog/2010/01/02/momentary-button-as-onoff-toggle-using-555/
or
http://www.bowdenshobbycircuits.info/page9.htm
(Relay Toggle Circuit Using a 555 or 556 Timer, Radio Shack carries both)

[Edited on November 12, 2013 at 1:54 AM. Reason : .]

11/12/2013 1:46:48 AM

^the "bistable flip-flop" circuit is interesting, thanks-

11/12/2013 7:14:45 AM