momentary to constant on

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jsyslak

Member - Posts: 2

Joined: June 18, 2012

Posted: June 18, 2012 at 10:58 PM / IP Logged

I have built this relay posted on the 12volt site:

momentary to constant on -- posted image.

I am using a Momentary switch which sends a 5v positive pulse. My question is how do I get the same switch to send the positive pulse to turn the circuit off? I am trying to use a stock Mercedes switch for my application. Need help, I'm new to this.

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: June 19, 2012 at 6:33 AM / IP Logged

Cheaper to use a latching relay for up to 10amps, no coil current draw whilst it's on.

Omron dual coil latching relay under $5 from Mouser or Farnell, constant pos(+) to one side of coils and alternative neg (-) switching supplied from the switch.

jsyslak

Member - Posts: 2

Joined: June 18, 2012

Posted: June 19, 2012 at 7:14 AM / IP Logged

I went on Mouser Electronics website and there are many options for this. Any chance you could post part number and wiring diagram. Thnx

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: June 19, 2012 at 7:42 AM / IP Logged

I got this from the UK RS components site but Mouser, Farnell, RS = the same company.

5amp/12VDC G6BK-1114P-US-DC12

10amp/12VDC G6CU-1114P-US-DC12

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: June 19, 2012 at 7:46 AM / IP Logged

Here's a layout, note the coils are polarised.

CDD_latch.bmp

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: June 19, 2012 at 11:29 AM / IP Logged

I just realised you wanted POS (+) switching all you have to do on those Omron relays is to ground both (-) sides of the twin coils and individually feed the (+) sides from your switch. Look at this.

7E3_latch.bmp

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momentary to constant on

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