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Old 20th March 2011, 12:21 PM   #21
AndrewT is offline AndrewT  Scotland
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away to try the next circuit.

reversed power does not look right.
The 470r is dropping 4V13 and the IR is getting just 0V7. Current draw ~8mA
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Last edited by AndrewT; 20th March 2011 at 12:29 PM.
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Old 20th March 2011, 12:24 PM   #22
Mooly is offline Mooly  United Kingdom
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If you want I can power mine up and take a scope shot of the output. Should be very distinct and clear with a full 5 volt swing. I'll wait and see what you come back with.
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Old 20th March 2011, 12:30 PM   #23
AndrewT is offline AndrewT  Scotland
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will try +5V to pin1 and use pull up on pin3, i.e. 10k pin1 to pin3

the excessive noise has gone.
I can clearly see a complex sawtooth type waveform @ ~1MHz, DC level 4V22
button pressing modulates that DC level bringing the reading down to 4v20
The spiky modulation cannot lock in.
The 1MHz signal has a blip every fourth cycle and on each twelfth cycle the blip goes deeper

Moving the 10k from pull down to pull up has reduced the noise and subsitutued that 1MHz
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Last edited by AndrewT; 20th March 2011 at 12:47 PM.
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Old 20th March 2011, 12:34 PM   #24
Mooly is offline Mooly  United Kingdom
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If it's not worked as I drew then you must try every configuration.
The receivers normally draw only a couple of ma so that's the first easy test. If it's dropping a lot of volts over the 470 ohm then it's the wrong connection.
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Old 20th March 2011, 12:48 PM   #25
AndrewT is offline AndrewT  Scotland
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I'll away and try applying +ve power to pin3 with the 470r protection and see what pin 1 does.

Pin3 via 470r to +5V0
Pin2 to 0V0
10k Pin1 to Pin3, lots of noise and 0V0 dc 60mVac ~200mVpp
Quiescent current draw down to ~0.9mA

Activating a button shows a deep change in pin1 voltage.
On some buttons I can see a 4v2 squarewave with a coded mark space ratio.

Is this a sign we closing in on a solution?
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Last edited by AndrewT; 20th March 2011 at 01:05 PM.
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Old 20th March 2011, 12:52 PM   #26
Mooly is offline Mooly  United Kingdom
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This is from that breadboard, timebase around 3ms/div. 5 volt swing... in reality it's pin sharp, must be some photography artifact makes it look a "broad" trace.
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Old 20th March 2011, 01:08 PM   #27
Mooly is offline Mooly  United Kingdom
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I'll look in again in a little while...

If you are not getting anywhere then is it possible the receiver has been damaged by an incorrect connection at fullysupply (with no limiting resistor).

Also the value of 470 ohm is just a ball park figure... confirm the receiver actually has around 4 to 5 volts on it. If the receiver draws much over 2 ma then 470 ohm may be a little high so reduce accordingly.
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Old 20th March 2011, 01:08 PM   #28
AndrewT is offline AndrewT  Scotland
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I'll reset the scope to 2V/div and 3ms/div and look see.

1V/div gives a clearer image.
I can't get a steady pattern, but there is a clear ~4V squarewave across the 10k pull up.
quiescent voltage across 10k=0v0.
button pressed gives ~0.7V

This seems to be the biggest and clearest output of the various connection I have tried.

Now, what do I do with R1 R2 that look like 22k each, both going to +5V6?

I'm booked to meet up for an afternoon walk across some of East Lothian.

Bye and thanks to all.
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Last edited by AndrewT; 20th March 2011 at 01:22 PM.
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Old 20th March 2011, 01:13 PM   #29
Mooly is offline Mooly  United Kingdom
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OK... and I can see I must have grabbed the wrong (ch2) probe as it's not compensated correctly for that scope channel. Rise and fall should be crisp.
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Old 20th March 2011, 01:36 PM   #30
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Mooly View Post
is it possible the receiver has been damaged by an incorrect connection at fullysupply (with no limiting resistor).
No ! it was never tested other than using the diode function of the DMM.
Quote:
Also the value of 470 ohm is just a ball park figure... confirm the receiver actually has around 4 to 5 volts on it. If the receiver draws much over 2 ma then 470 ohm may be a little high so reduce accordingly.
Yes setting the lab supply to overvoltage while monitoring the actual chip supply and setting to 5V00

And I'm gone
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