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Old Jul 10, 2006 | 07:52 AM
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Default electrical engineers/pros chime in

Ok I'm trying to mount an ipod and a radar detector on my bike. You can't hear the radar without head phones. My question is, is there an electrical device that will override the ipod signal once the radar is heard? a lot radar detectors have a headphone output, and thats what i will be using.

I dont want to mix them, i want the ipod to cut off when the radar is alerted.

the headphones will be plugged into both sources.
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Old Jul 10, 2006 | 03:50 PM
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Default Re: electrical engineers/pros chime in (DaZman69)

Just get the led helmet kit for the radar detector. I can't remember what the website is, but there's a wireless led kit that goes in your helmet that will go off when the radar is triggered
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Old Jul 10, 2006 | 04:43 PM
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Default Re: electrical engineers/pros chime in (a_s_ol_)

i know, too much money
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Old Jul 10, 2006 | 07:36 PM
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Default Re: electrical engineers/pros chime in (DaZman69)

CS student...

First of what kind of radar dectector do you have??

how does it tell you visually.. if you could see it..

Also what kind of bike do you have?

Do you have a stereo on your bike, or are you just listening to your ipod, through ipod head phones?

------------------------------------

Assuming that the radar dectector "beeps" when it "sees" radar:

2 blocking diodes

1 for the L or R channels, your choice, of the ipod
1 for the (assumed) mono-output of the radar detector

wire the grounds together....
wire the mono out of the radar to either the L or the R channel with the blocking diode...

it should work, though when the beep is triggered it might be noticably louder than the music...
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Old Jul 11, 2006 | 11:11 AM
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Default Re: electrical engineers/pros chime in (bpr0422)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bpr0422 &raquo;</TD></TR><TR><TD CLASS="quote">CS student...

First of what kind of radar dectector do you have??

how does it tell you visually.. if you could see it..

Also what kind of bike do you have?

Do you have a stereo on your bike, or are you just listening to your ipod, through ipod head phones?


Assuming that the radar dectector "beeps" when it "sees" radar:

2 blocking diodes

1 for the L or R channels, your choice, of the ipod
1 for the (assumed) mono-output of the radar detector

wire the grounds together....
wire the mono out of the radar to either the L or the R channel with the blocking diode...

it should work, though when the beep is triggered it might be noticably louder than the music...
</TD></TR></TABLE>

gsxr 600, everything is gonna be custom mounted. It will have an indicator, but I know for a fact I wont see it no matter where i put it. If im going fast on a bike, im looking dead ahead

blocking diode? how does that work?
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Old Jul 11, 2006 | 11:19 AM
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<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">blocking diode? how does that work?
</TD></TR></TABLE>

Simply put, a diode is a one-way valve for electricity...

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Old Jul 11, 2006 | 11:40 AM
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Default Re: (B18C_EJ8)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C_EJ8 &raquo;</TD></TR><TR><TD CLASS="quote">Simply put, a diode is a one-way valve for electricity...</TD></TR></TABLE>

If you put that inline with the ipod signal, you will lose half of the wave (audio is ac).

If you have a light on the detector, wire a relay to the light (might need a transistor to drive the relay), and have the relay cut off and/or switch audio to the radar detector.

Another way to do this is to use an opamp as a comparator. When it senses a voltage higher than its set threshold, its output will swing to the positive rail, which can be used to drive a relay, once again, cutting off and/or switching the source to the radar detector.

The relay would go inbetween the ipod/detector and headphones. I can draw up a schematic if you're interested.
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Old Jul 11, 2006 | 11:47 AM
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BTW, I'm not a biker, but isn't listening to music through headphones sortof dangerous?
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Old Jul 11, 2006 | 01:02 PM
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Default Re: (B18C_EJ8)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C_EJ8 &raquo;</TD></TR><TR><TD CLASS="quote">BTW, I'm not a biker, but isn't listening to music through headphones sortof dangerous? </TD></TR></TABLE>

Well how is it anymore dangerous than blaring music in your car?
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Old Jul 11, 2006 | 01:43 PM
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your only luck to actually still get good sound quality out of the ipod is to merge the connections. trust me, you'll be able to hear the radar detector, it WILL be louder than your ipod. plus, you dont want your music to cut off during false alarms.
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Old Jul 11, 2006 | 02:48 PM
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Default Re: (Znypar)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Znypar &raquo;</TD></TR><TR><TD CLASS="quote">your only luck to actually still get good sound quality out of the ipod is to merge the connections. trust me, you'll be able to hear the radar detector, it WILL be louder than your ipod. plus, you dont want your music to cut off during false alarms.</TD></TR></TABLE>

good thinkin lincoln, maybe ill try that. I was also thinking about getting a jammer, I'm not sure how well they work. And its kind of a big gamble testing it out. I guess I could drive by one of those self radar things. Anybody ever use one?
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Old Jul 11, 2006 | 05:49 PM
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Personally I would use an opamp for each signal source so you could adjust the gain of each individually. (I seriously doubt the beep from the radar is DC) how many people can hear DC?

Tie the outputs of the opamps together.

Now run an invertor gate to the power of one opamp. Run two invertors to the other opamp. If the led is on then the power to opamp 1 is on and opamp2 is off. If the led is off then opamp2 is on and opamp1 is off.

Gated devices will deliver 5V biased properly you have a total of 2.5 volts of swing.

Sounds complicated but its really not.



Modified by nsxxtreme at 6:59 PM 7/11/2006
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Old Jul 12, 2006 | 05:43 AM
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Default Re: (nsxxtreme)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nsxxtreme &raquo;</TD></TR><TR><TD CLASS="quote">Personally I would use an opamp for each signal source so you could adjust the gain of each individually. (I seriously doubt the beep from the radar is DC) how many people can hear DC?

Tie the outputs of the opamps together.

Now run an invertor gate to the power of one opamp. Run two invertors to the other opamp. If the led is on then the power to opamp 1 is on and opamp2 is off. If the led is off then opamp2 is on and opamp1 is off.

Gated devices will deliver 5V biased properly you have a total of 2.5 volts of swing.

Sounds complicated but its really not.

Modified by nsxxtreme at 6:59 PM 7/11/2006</TD></TR></TABLE>

or you could just follow the rule of k.i.s.s. and use the volume controls which will do the same thing on headphones
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Old Jul 12, 2006 | 08:49 AM
  #14  
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Default Re: (Znypar)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Znypar &raquo;</TD></TR><TR><TD CLASS="quote">

or you could just follow the rule of k.i.s.s. and use the volume controls which will do the same thing on headphones</TD></TR></TABLE>
Merging signals together is a ghetto rigged solution. You take the risk of eventually blowing out the output out of the IPOD or the radar.

You could build a summer which would sum the two signals together but its not something I would do by connecting the two signals to each other.

My solution is "simple" to me, would take me 5 min and only requires a brain larger then a peanut. There is also no risk at damaging either device.
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