Momentary relay driving circuit

dine1967 · 8th April 2003, 01:45 PM

I bought the following chip from renton which is a preprogrammed PIC and works on sony protocol. I would like to use this for remote control of my preamp (volume up /down). The problem with the chip is that its output is not in pluse mode. ie. if I press the remote , the corresponding output goes from 0 to 1. It stays at 1 till I press the button again. Is there any circuit to drive relays momentarily ie it clicks everytime the output at PIC changes???? thanks
http://www.rentron.com/remote_control/IR-D14.htm

thylantyr · 8th April 2003, 02:57 PM

Many ways to skin a cat.

Edge triggered "one-shots".

Example; The cmos chip, the 4538 is a monostable multivibrator.
It's edge triggered, either rising or falling edge (you pick).
You select the output pulse duration. Connect the output
to a transistor to drive the relay.

http://www1.jaycar.com.au/images_uploaded/CD4538BC.PDF

tiroth · 8th April 2003, 03:19 PM

We need something triggered on both rising AND falling edge though, right? Two ORd 4538s (one rising, one falling) I guess. There has to be a more elegant solution though...

thylantyr · 8th April 2003, 06:15 PM

You get two one-shots in one IC package, use two
or'ing diodes to drive the relay transistor. Are you looking
for a single transistor solution, something simpler along
those lines?

tiroth · 8th April 2003, 06:38 PM

Ah...didn't think of that obvious solution. Nice!

dine1967 · 8th April 2003, 06:57 PM

isn't this same as a standard IC555 timer in monostable mode. Iam new to this digital stuff .... please help

thylantyr · 8th April 2003, 07:44 PM

I think the 555 mono mode only triggers on negative edges.

dine1967 · 8th April 2003, 08:02 PM

thanks, will order the IC and get cracking.

8th April 2003, 01:45 PM	#1
dine1967 diyAudio Member Join Date: Jan 2003 Location: NJ	Momentary relay driving circuit I bought the following chip from renton which is a preprogrammed PIC and works on sony protocol. I would like to use this for remote control of my preamp (volume up /down). The problem with the chip is that its output is not in pluse mode. ie. if I press the remote , the corresponding output goes from 0 to 1. It stays at 1 till I press the button again. Is there any circuit to drive relays momentarily ie it clicks everytime the output at PIC changes???? thanks http://www.rentron.com/remote_control/IR-D14.htm

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8th April 2003, 02:57 PM	#2
thylantyr diyAudio Member Join Date: Feb 2001 Location: Mars	Many ways to skin a cat. Edge triggered "one-shots". Example; The cmos chip, the 4538 is a monostable multivibrator. It's edge triggered, either rising or falling edge (you pick). You select the output pulse duration. Connect the output to a transistor to drive the relay. http://www1.jaycar.com.au/images_uploaded/CD4538BC.PDF

8th April 2003, 03:19 PM	#3
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	We need something triggered on both rising AND falling edge though, right? Two ORd 4538s (one rising, one falling) I guess. There has to be a more elegant solution though...

8th April 2003, 06:15 PM	#4
thylantyr diyAudio Member Join Date: Feb 2001 Location: Mars	You get two one-shots in one IC package, use two or'ing diodes to drive the relay transistor. Are you looking for a single transistor solution, something simpler along those lines?

8th April 2003, 06:38 PM	#5
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	Ah...didn't think of that obvious solution. Nice!

8th April 2003, 06:57 PM	#6
dine1967 diyAudio Member Join Date: Jan 2003 Location: NJ	isn't this same as a standard IC555 timer in monostable mode. Iam new to this digital stuff .... please help

8th April 2003, 07:44 PM	#7
thylantyr diyAudio Member Join Date: Feb 2001 Location: Mars	I think the 555 mono mode only triggers on negative edges.

8th April 2003, 08:02 PM	#8
dine1967 diyAudio Member Join Date: Jan 2003 Location: NJ	thanks, will order the IC and get cracking.

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