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Relay Timer

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RFJammed

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Do they make a relay with a timer built into it? I'd like to put my radios on a timer so when the car starts, they come on; but when I shut the car off, they stay on for a set amount of time. Someone point me towards the right product? Thanks.
 

RFJammed

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Thanks. Thats kind of what I'm looking for.

Is it an alright idea to hook a scanner up to a relay, so it powers up/on whenever it receives radio without manually powering it on? Or will voltage drops consume the scanner? Whats the best way to avoid that on a ig. switched system? Thanks.
 

LT-EMTC9

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I have one hooked up to a pager in our fire house. When the tones go off, I have it delay 5 seconds before the bell rings. They were very expensive, I ended up getting one from one of our FF's who works for a fire alarm company.
 

slicerwizard

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Is it an alright idea to hook a scanner up to a relay, so it powers up/on whenever it receives radio without manually powering it on? Or will voltage drops consume the scanner? Whats the best way to avoid that on a ig. switched system? Thanks.
I don't understand what you're saying. You want it to power up when what happens?

If it happens once a day, sure, just power up / power down the scanner. If it happens frequently, it would probably be better to leave the scanner on and use the relay to enable/disable an external speaker.
 

k0pwo

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I have this same type of setup on one of my vehicles and it is used to power my radio stack which is located in the vehicle.

For my system I built the timer with a 555 timer and a few other parts and it leaves on the radio power for 10 minutes (its adjustable) and then shuts off the power to the radios. I do have an override button so if I am sitting in the vehicle for longer than 10 minutes and I wish the radios to stay on I can switch the override switch on and the radio will stay on until I turn the override off. At that point, the timer will once again kick in and turn the radios off after the 10 minute timer period. Just like I had just shut off the vehicle.

The circuit isn't difficult to construct. However, if you wish to purchase one, you can find 12 volt timers at most electrical supply houses. Hook this up to the switch leg of your relay and you will have the same system as you are looking for.

Hope this helps.

Dave
 

DickH

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Mar 12, 2004
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LT-EMTC9 said:
When the tones go off, I have it delay 5 seconds before the bell rings.
Why would you want to delay a response - even for 5 seconds?
 

k0pwo

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Because when you start the car there is always a spike generated in the ignition and power system that if a radio is on could damage the radio. I have seen it happen, but only once, some people do install all radios with a power on delay after the car has been started...

Dave
 

DickH

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k0pwo said:
Because when you start the car there is always a spike generated in the ignition and power system that if a radio is on could damage the radio. I have seen it happen, but only once, some people do install all radios with a power on delay after the car has been started...Dave
Why don't you use the quote button so we'll know who you are answering. If you're answering my question, it doesn't make sense.
 

okccsi

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Feb 2, 2006
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OKC, OK
k0pwo said:
Because when you start the car there is always a spike generated in the ignition and power system that if a radio is on could damage the radio. I have seen it happen, but only once, some people do install all radios with a power on delay after the car has been started...

Dave
My Kenwoods have a built in power on delay. The other radio's I just use the on/off knob. Why not hook up each radio to a switch box, then power them on as needed?

OKC CSI
 
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