More IR Remote stuff

Apparently the problem with the Muter was the IR decoder module.  Monitoring the output of the module there would be periods of noise pulses:

Then the noise might shrink and the output would invert !

Sony TV mute code 29, output inverted from active low to active high, weird !

  I'm guessing that this is some problem inside with the AGC ?   Here is a picture of the defective module:

Anyway, found a Sharp decoder module in the parts box, unfortunately it isn't made anymore but it is a 40 kHz module which works with the Sony remotes.

I hooked it up to the Muter in place of the defective module and now the Muter works !

However I will still abandon adding a timer to the Muter.  A mini-one button IR remote will be made for the Sony CMT-EP313 stereo with built in delay timing.  I found an example of a one button remote in the junkbox:

from the now defunct All Electronics :(

But with the 9V battery holder it would require some voltage regulation for use with a PIC.  So I might just snatch the IR LED and leave the rest alone.

IR remote progress is being made - although slowly.

2025-08-06 Update: in the process of taking the lid off the non-working IR module I may have discovered the reason why it didn't work correctly - I didn't solder the three wires in 1998 - they were just crimped on - sort of like ersatz wire-wrap.

Best Regards,
Chuck, WB9KZY
http://wb9kzy.com/ham.htm