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>>> Hardware Idea <<<

 
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56Effie is offline Old Post 06-17-2004 07:24 PM
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56Effie
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Hardware Idea

Having problems with channel chainging gave me an idea. Why not open up the Sat or Cable receiver and solder a two conductor wire in at the IR receiver then into a simple optoisolator fed into a headphone jack mounted in the back of the case. In theory a patch cable could be used between the Tivo IR out straight into the back of the Sat/Cable box. This setup would allow your factory remote to control the device as normal but give Tivos IR blaster a direct interference free connection.
Has anyone tried this or see anything wrong in my theory?
Craig

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stevel is offline Old Post 06-17-2004 07:28 PM
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stevel
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Seems simpler to me to insert a mini-emitter "in view" of the sensor. You're making some assumptions about the electrical characteristics of the receiver.

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56Effie is offline Old Post 06-17-2004 07:54 PM
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56Effie
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That's basically what an Opto-Isolator is a single device with both emmiter and sensor inside. There is no hardware assumptions, it would work with any device that the Tivo would have normal control over via IR. This is just a less cluttered way to get an interference free signal and without worry of proper alignment. A piece of two conductor wire, a case mountable jack, opto and patch cable is all that's needed. Opto's are less than a buck in most cases.

Craig

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classicsat is offline Old Post 06-17-2004 10:20 PM
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classicsat
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You are assuming the IR receiver in a cable or satellite box is just an eye. It is not. It is a unit which has an IR sensitive photo eye, plus an amplifer filter and detector. It outputs a logic low signal with the presence of an IR carrier (not just IR, but IR modualted at 35-45 Khz). At that, they are a sealed integrated unit you cannot have direct access to the eye.

To effectively do what you want, all you really need to do is filter out the carrier from the IR out on the Tivo (on the transistor side of the opto isolator) with a hokeinductor and capacitor.

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56Effie is offline Old Post 06-17-2004 10:50 PM
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56Effie
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I've not looked but I bet your right. I forgot about the ir modules on the receive end. Do you know how the two leds are wired in the blaster (par. or Ser.)?


P.S. Did you mean Choke Inductor?

Craig

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classicsat is offline Old Post 06-18-2004 08:31 AM
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classicsat
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A: I don't know. I made one with just one LED,and it works fine.

B: Yes, a choke inductor, and capacitor, sized to snub the carrier into a DC waveform.

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cachecard_user is offline Old Post 06-24-2004 09:47 AM
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cachecard_user
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quote:
Originally posted by 56Effie
Do you know how the two leds are wired in the blaster (par. or Ser.)?


Craig




trial and error

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