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Momentary Output Pulse


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pts760 
Copper - Posts: 403
Copper spacespace
Joined: December 11, 2009
Location: United States
Posted: February 13, 2016 at 12:18 AM / IP Logged Link to Post Post Reply Quote pts760
Using this diagram:Momentary Output Pulse -- posted image.
How would I extend the pulse to 5 seconds instead of 1/2 second? Multiply the capacitance of the polarized cap by 10 which would equal 10k uF?
I searched the internet for 2 hours and couldnt find a simple circuit to do what I want so I was hoping someone here could help me out. Thanks in advance.
I drink current, eat ohms, and bleed voltage
kreg357 
Platinum - Posts: 7,781
Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: January 30, 2009
Location: Pennsylvania, United States
Posted: February 13, 2016 at 9:33 AM / IP Logged Link to Post Post Reply Quote kreg357

While a bit more expensive, would a Directed 528T be an alternative?  It's adjustable from 1 - 90 seconds and 15 Amp capable.  A nice package and easily adjustable timed output.

Soldering is fun!
pts760 
Copper - Posts: 403
Copper spacespace
Joined: December 11, 2009
Location: United States
Posted: February 13, 2016 at 10:03 AM / IP Logged Link to Post Post Reply Quote pts760
I've used a 528t before and it would work but I would like to add some more knowledge to my bag of tricks by using a relay, cap, & resistor and understanding how that circuit works.
I drink current, eat ohms, and bleed voltage
pts760 
Copper - Posts: 403
Copper spacespace
Joined: December 11, 2009
Location: United States
Posted: February 14, 2016 at 4:37 PM / IP Logged Link to Post Post Reply Quote pts760
This diagram gets posted on his website and no one knows how the cap/resistor values are calculated and how that relates to delay in seconds?
I drink current, eat ohms, and bleed voltage
Ween 
Platinum - Posts: 1,364
Platinum spacespace
Joined: August 01, 2004
Location: Illinois, United States
Posted: February 14, 2016 at 7:11 PM / IP Logged Link to Post Post Reply Quote Ween
Read here for more info: http://www.electronics-tutorials.ws/rc/rc_2.html
The delay will depend upon the coil resistance, drop out voltage of relay, capacitance value, parallel resistor value.
pts760 
Copper - Posts: 403
Copper spacespace
Joined: December 11, 2009
Location: United States
Posted: February 14, 2016 at 7:51 PM / IP Logged Link to Post Post Reply Quote pts760
Excellent! Thank you for the info and direction. I really appreciate it.
I drink current, eat ohms, and bleed voltage
geepherder 
Platinum - Posts: 3,668
Platinum spaceThis member consistently provides reliable informationspace
Joined: October 27, 2003
Posted: February 16, 2016 at 12:44 PM / IP Logged Link to Post Post Reply Quote geepherder
For a few seconds:
http://www.diymobileaudio.com/forum/how-articles-provided-our-members/2727-designing-your-own-delay-circuit.html
For a few minutes:
https://www.youtube.com/watch?v=GeveeSTyvGs
My ex once told me I have a perfect face for radio.
luhanz.18192 
Member - Posts: 1
Member spacespace
Joined: June 14, 2016
Location: Minnesota, United States
Posted: June 15, 2016 at 12:56 AM / IP Logged Link to Post Post Reply Quote luhanz.18192
This is my first post on this forum so please bear with me. Im using a bluetooth speaker as a transmitter and a power amp to eliminate the radio in a older car and what im wondering is how i would use a constant power sorce (ignition switch on) to send a single pulse to the speaker toeeliminate a tactile switch. I already have a DC/DC Converter 12v Step Down to 3V/3A Power Supply to send the proper voltage just not sure about the constant to momentary. Any help would be greatly appreciated.
Luhanz

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