Keep in mind that since the ring of the receiver's "control out" jack isn't grounded, you have to ground the VCR to the receiver another way, like with the video and audio cables.Īnd now, two pieces of AV equipment which were never meant to be attached are playing well together. And last, I plugged the other end of the cable into the Pioneer receiver's "control out" jack and tried the remote again, this time pointing it at the receiver. I tried the remote again and made sure that it didn't work anymore, since the plugged-in cable should be overriding the internal IR sensor. Next, I plugged one end of a cable into the new jack and left the other end of the cable unattached to anything. Fortunately, the back panel of the VCR was plastic, so it was easy to drill.įirst, I plugged nothing into the jack and used the remote with the VCR to make sure it still worked. Here are the wires soldered onto the sensor output, the resistor, and a ground point.Īs for where to put the jack, I found a convenient spot on the back of the VCR and drilled a hole just large enough for the jack. If something is plugged in, then the tip of the plug will be connected to the resistor, and the IR sensor will be disconnected. The jack is wired in such a way where the IR sensor will be connected to the resistor if nothing is plugged in.
CONTROL IN TRMINAL AND CONTROL OUT ON THE BACK OF THE TV SERIES
I cut one lead of the resistor and connected the 3.5 mm closed-circuit type jack in series with the sensor's output and the resistor. Also, the volt meter, when set to AC volts, showed me an AC voltage on the output when I pressed a button on the remote.Īfter some probing around with an ohm meter, I found that the output of the IR sensor went to a nearby resistor. So, one of the five volt leads was the output, which is normally high. A volt meter showed one lead at zero volts, and the other two were around five volts. I opened up the VCR and found the sensor. I figured that all I needed to do to add a jack would be to wire a closed-circuit type of 3.5 mm mono jack in series with the built-in IR sensor. I have a Mitsubishi HS-U447 VCR that has no control jacks at all. I also found that the "control out" jack repeats the signal from any remote I pointed at the unit, not just my Pioneer remote. Both channel one and channel two showed the same signal. I pointed a remote at both units and pressed a button. To prove it, I hooked channel one of my scope to the tip line of the "control out" jack and channel two of the scope to the output of a Sharp IR receiver module. I suspected that the control signal was just a demodulated version of the IR signal coming from the remote. I had to find a ground somewhere else on the receiver, like one of the RCA jacks.
Interestingly enough, it doesn't look like the outer ring of the control jacks are grounded. I also found that the internal pull-up resistor for the "control in" jack was around 100K. I found that with a 10K pull-down resistor, the "control out" voltage was about half of its normal five volts, so I know that the internal pull-up resistor was the same. To find out, I attached a pull-down resistor between the control out jack and ground. I suspected that the control jack was the same. Those modules have an open collector output and a pull-up resistor. I saw a train of zero volt pulses, which look a lot like what comes out of those Sharp IR receiver modules.
I pointed a remote at the receiver and pressed a button. There was about five volts of output on the tip line when it was idle. To find out what kind of circuit was on the other side of the recever's "control out" jack, I plugged a 3.5 mm mono plug into the jack and hooked it up to an oscilloscope. Plugging into a control jack on the back of the unit is a lot cleaner than sticking an IR emitter to the front of your equipment. It's like a wired version of an IR repeater system. This is especially cool when the controlling unit and the controlled unit are in different rooms.
If I connect the receiver's "control out" jack to my DVD player's "control in" jack, the DVD player responds to remote contol signals via the "control in" jack instead of via its built-in IR sensor. The idea is that you can link all your Pioneer equipment together so that they can control each other. My Pioneer DVD player also has a "control in" jack. One is a "control in" jack, and the other is a "control out". There is a pair of 3.5 mm jacks on the back of my Pioneer receiver.
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