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Old 20th March 2011, 09:09 AM   #11
Mooly is online now Mooly  United Kingdom
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Just looking again at the diagram post #1.

It just doesn't look correct. The IR receiver as mentioned above is normally connected to a 5 volt supply with the output connected to a designated port on the micro. That port is configured via the code to accept the TTL level signal from the receiver.

Your diagram appears to show that supply coming from a port on the micro... !!!! Why ?

The micro has no means of processing and interfacing with "just photo diodes" as far as an making an IR receiver goes. It needs a fully processed 0/5 volt logic signal applied.
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Old 20th March 2011, 10:26 AM   #12
AndrewT is offline AndrewT  Scotland
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The amp has been tested a couple of times. It defaults to input 2 after a 12 second start up procedure.
One mis-wire corrected. and rebuilt.

I am now at the stage of trying to get the remote connected.
testing without damage is attractive. I will re-read what was said in there.

Both the 22k are fed from the regulated 5V supply (except it measures 5.6Vdc). The chip monitors the lower ends of both 22k.
I see your and the earlier point that this metal box with the window is not just a transistor.

Is there a safe way to connect the (unknown) receiver to a plugboard so that I can scope the outputs? This hopefully will show the ttl signal or the carrier frequency with some intermittent modulation when I activate the controller buttons.

The CPC receiver module pic looks very similar. The middle leg (2) is connected to the metal case. Legs 1 & 3 exit either side of 2.
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Old 20th March 2011, 11:01 AM   #13
fotios is offline fotios  Greece
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Andrew, by sure you have an IC infrared receiver and the middle pin of any IR receiver "IC" is the GND node. The +V supply pin is either the Nr. 1 pin or Nr. 3 pin. In most cases, pin Nr. 1 is the output of IR circuit. The output of IR in "idle mode" is +5V. When it receives a code its output drops to 0V. In any serial protocol (from those that i know) the transmitted/received code forms "slots" on a constant +5V line. Another one issue, is that the IR receiver should be tuned with the carrier frequency of the remote control handset transmitter frequency that you use. Are you sure that you have compatible (in carrier F) IR handset and IR receiver? If yes, then you can tie pin 1 or 3 of IR receiver thru a 10K resistor in +V supply and then you can find what pin is the output with your oscilloscope.
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Old 20th March 2011, 11:07 AM   #14
AndrewT is offline AndrewT  Scotland
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tying pin1 to +5V via a safety resistor and pin 2 to 0v allows the scope (10M load) to see the output at pin 3. Is it as simple as that?

What if pin 3 is the +5V and I have it connected the wrong way? Does the safety resistor protect the receiver from damage?

You can see I am not a digital person !
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Last edited by AndrewT; 20th March 2011 at 11:15 AM.
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Old 20th March 2011, 11:36 AM   #15
Mooly is online now Mooly  United Kingdom
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Where are you up to ?

The output should be a clean 0/5volt signal. Anything other than that and there's something amiss. If it's an open collector then the 10m scope load will show as severe slew limiting on the rising and falling edges.

Using a 470 ohm allows you to "try it all ways" safely. Honestly, I've done it many times with unknown IR devices.

Andrew... I have one very similar in front of me. From left to right it's ground/+5v/out.
On this one the output is an open collector NPN so it needs a pull up to 5 volts... sorry I mentioned the other about I think.
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Old 20th March 2011, 11:39 AM   #16
fotios is offline fotios  Greece
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I am also a non digital guy!
The output of IR receiver, it is the collector of a NPN transistor which is connected thru a resistor of some KΩ to the +V supply rail, internally in IC. Indeed, it is very simple.
Well Andrew, i think that you have find the output of IR receiver. For any further information, i will be here after 3 hours (lunch, ouzo and sleep now ).
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Old 20th March 2011, 11:48 AM   #17
AndrewT is offline AndrewT  Scotland
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I'm going upstairs to plugboard it with a 5Vdc supply via 470r to pin1.
Ov to pin2. 10k pin3 to pin2
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Old 20th March 2011, 12:04 PM   #18
Mooly is online now Mooly  United Kingdom
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Still have a cobbled together prototype here,
Attached Images
File Type: jpg DSCN0132 (800x307).jpg (216.6 KB, 33 views)
File Type: jpg IR.jpg (10.7 KB, 30 views)
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Old 20th March 2011, 12:14 PM   #19
AndrewT is offline AndrewT  Scotland
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Tested as post17.
Very noisy signal across 10k, ~60mVpp.
Draws 3.8mA through the 470r.
4V2 across 10k and drops to 4V19 when I activate a controller button.
I can see spiky modulations on the output but I can't get the scope to lock on to them.

Mooly,
I see you have middle leg at 5Vdc
and taken output to 1k pull up.

Is it worth re-powering to your example?
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Last edited by AndrewT; 20th March 2011 at 12:17 PM.
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Old 20th March 2011, 12:18 PM   #20
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Definitely... just put a 470 ohm in series with the supply just in case.
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