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Old 21st March 2011, 02:08 PM   #31
AndrewT is offline AndrewT  Scotland
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Got it working.
Yes, it's a module rather than just a opto transistor.
It starts working with 3.5Vdc and in circuit has 5V54 on pin3, pin2 = 0V0
The 10k pull up on pin1 shows a few tenths fewer volts.
Clear codings on pin1 when buttons pressed.
Damaged a Control board when I connected power to the wrong pair of pins, very big OOPs.
Second board works, select inputs and adjusts volume. But the vol pot must be very sticky in the mid range, it slows down to almost a standstill in both directions.

Checked noise on pins 1 & 2
Pin 2 fed from an RC filter, 47r and 47uF, shows approx 7mVpp sharp pulses and 1.1mVpp wideband noise.
Connected 100nF ceramic across pin3 & pin2, wideband noise reduced to 1mVpp and all pulse noise buried in the wideband.
Moved the decoupling cap to the output of the RC filter on the control board. Absolutely no effect. Proves where decoupling must be located !
This decoupling may have a very slight effect (difficult to read if any change) on the wideband noise of ~0.5mVpp at pin1. The digital output (~3.8Vpp) of pin1 completely swamps the noise which is ~-77dB under the digital signal.

Thanks for all the help.
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Last edited by AndrewT; 21st March 2011 at 02:37 PM.
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Old 21st March 2011, 03:02 PM   #32
Mooly is offline Mooly  United Kingdom
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Hi Andrew, pleased to hear it's all working.

Decoupling... this is what I keep saying regarding ultra low noise regs etc. Great, but the effect is totally lost when connected via some leads, PCB etc to a "noisy" DAC or whatever.

I wouldn't worry to much over noise etc on the IR receiver supply, certainly not at the levels you mention... but it's nice to get it right
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Old 21st March 2011, 06:09 PM   #33
fotios is offline fotios  Greece
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Hi Andrew
Glad to hear that you resolved the problem. As for the vol pot unstable rotation speed, probably it is a matter of wrong MCU code "delays".
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