decreasing the pulse duration

i am an idiot wrote: The following diagram is for a negative input and a negative output, do you need a negative or a positive output? https://www.the12volt.com/installbay/forum_posts.asp?tid=112480&KW=horn+honk+lock#542074

Perfect! This link takes me directly to a way to do this. Sorry if I missed it from other's posts. I really appreciate all the help from everyone. You guys really know this stuff inside and out I think a donation is in order

Do you need my paypal...Oh...you meant to the site...  Yeah was wondering if there was going to be a response to the several posts about using the sirens output to a relay...Or MR. I priceless info...  Also you will get that cool symbol next to your name...!M.E.C.P & First-Class

Go slow and drink lots of water...Procrastinators' Unite...Tomorrow!

tommy... wrote: Do you need my paypal...Oh...you meant to the site...  Yeah was wondering if there was going to be a response to the several posts about using the sirens output to a relay...Or MR. I priceless info...

Thanks Tommy, You've been a big help. I wiah I could compensate everyone for their time but funds are so limited these days! I made a donation to the site but the info in the donation probably won't be identifiable to my account here on this forum. Should I pm the admin as to who the donation is from or is there no need? thx

Hi again, As I was reading the thread containing the relay diagram to lengthen or shorten a pulse and saw this....

Chris Luongo wrote: I'm pretty sure the only thing you can do with off-the-shelf parts like capacitors is extend the pulse, not reduce it. A DEI 528T, or a PAC TR-7 pulse timer would probably do what you want, at additional cost.

So, now I'm wondering if this will do what I need or not? thx

I spoke with a technician at PAC this morning and he advised that the TR-7 would NOT do what I wanted to do. I believe he said minimum pulse duration would be 1 sec with the TR-7. I believe his name was Ray?

A half of a second is an eternity.  Use the diagram I posted and maybe a 100 or a 47 microfarad capacitor.

I did not make the diagram, I simply modified it to work with a negative input and to have a negative output.  The diagram came from this site.  It works, if it did not, you would not find it here.  https://www.the12volt.com/relays/page5.asp#ctm

aviator172 wrote: Hi again, As I was reading the thread containing the relay diagram to lengthen or shorten a pulse and saw this.... Chris Luongo wrote: I'm pretty sure the only thing you can do with off-the-shelf parts like capacitors is extend the pulse, not reduce it. A DEI 528T, or a PAC TR-7 pulse timer would probably do what you want, at additional cost. So, now I'm wondering if this will do what I need or not? thx

Yes, a 528t will work, cheap and easy. I use them all the time to adjust for the output that I need, be it a shorter pulse or a longer one, upto 90 seconds.

Some thoughts here. Omar's right, Mr I is right, tommy and t&t are all correct. when it comes to general install knowledge, Chris Loungo is probably tops.  Euro Cars, ask me, circuit designs, no one is better than Mr.I and if he says it wil work, believe him.  If you have a relay question, himself or KP. 3 years ago I was in the middle of nowhere doing a 3 Series Cabriolet, arming the alarm with the roof down tends to lift the roof a couple of inches even set to 0.8secs pulse. Anal customer, I tried to set up the pulsed relay, no joy, no time or facility to bench test so I threw in a home made 528t (Velleman Kits). It worked perfectly.  So go with whatever you think is right. In the UK that kit cost me £4.00, the 528t  £7.00 and the relay set -up £2.00 (x 1.5 =$)  Cost inthe labour on home made kit and relay set-up against the 528t.