part for latching relay or equivalent

From the description in the diagram is looks like the relay is able to mechanically latch and unlatch with successive pulses. Most likely there is something available to do that, maybe working like a ball point pen mechanism. Unfortunately, the one I linked to won't do that though, sorry to point you in the wrong direction there. Whoever drew up the diagram probably can tell you the part number for that relay though, must be someone here- Even with the correct relay though, the output may not be as clean as you might need, because it'll briefly send a short pulse on the other output before clicking over to the second output. If that's a problem, or you can't locate the relay, it'd be easier to do it with solid state components. A J-K flip flop along with a logic gate would do it.

dualsport wrote: These are single coil latching relays, 1 Form C, 2 Form C, and 4 Form C respectively: DS1E-ML-DC12V DS2E-ML-DC12V DS4E-ML-DC12V Available from Digikey: $5.44

I was wondering, how can I find the same exact relays but in a more 'automotive oriented' packaging, I mean with a connector socket and all, not SPDT type ?

Any idea what to look for on the DigiKey site ?

Arggh. I see D2 is upside down in the diagram in that post I made.Should be like this instead-

cahilj wrote:

guys, i've been looking for this impulse relay (mechanical latched) for years and yet to find it. i need this 2 negative output to lock/unlock the door with momentary switch. from what i understand from this schematic: 1. when momentary switch is hit#1 2. armature of impulse relay is closed 3. coil relay (85-86) is stayed neutral (due to same voltage) 4. 1st output is shorted to ground via 87a-30-momentary switch 5. door is locked -------- 1. when momentary switch is hit#2 2. current flow from impulse relay armature (due to close) to ground via 86-85-momentary swith 3. coil relay is energized and close its armature (87-30) 4. current flows from coil of impulse relay and open its armature 5. 2nd output is shorted to ground via 87-30-memontary switch 5. door is unlocked could anyone advice me on the alternative?? regards jigc

magnecraft This one should operate as required for that setup-      711 Impulse Sequencing Relay / DPDT 12 Amp Rating The 711 Impulse Sequencing relay is an alternating relay used for load sharing or toggling ON/OFF of the load. Uni-directional momentary pulses cause the contacts to transfer from one side to the other. There is no need to redirect the polarity of the input in order to change and maintain states. $23.20 at allied here

Not sure how the LED indication atop the relay is wired in; couldn't find out the details from what I saw on the manufacturer's datasheet. It only says the LEDs indicate which side the contacts are in, but not much else. edit: the LEDs are only lit up when the input pulse is coming in, so it won't draw any power at all in the standby state.

The difference is that you want a momentary pulse output instead of the steady toggled output, so you could just use a logic gate like an AND, (or NAND) taking the pulse input, combined with one of the outputs from the flip flop (the Q or /Q). That way the output only goes active during the time you send the input pulse, and is low otherwise. If you use a NAND gate, you can run the output to a transistor as shown in the upper dotted box. When the input switch and Q are both high, the gate output goes low, which turns on the transistor and outputs 12V. You could use that signal directly or drive a relay if necessary. A relay would be necessary if you need to switch higher current or voltages. Add miscellaneous protection circuitry and you should have an equivalent function.