TV with Audio Modification

Bluhair

I have not seen any mention of this modification before. It is simple to get Audio from a Television along with the video.

I was looking at the Propeller Demo Board Rev D/E/F Schematic and noticed that Pin 15 was labeled aural subcarrier in broadcast mode but only went to video out. Sooooooo. Did a little experimenting and the following seems to work except for 60HZ hum when no audio is being played. Hmmm maybe capacitor is in order.

Schematic would not display correctly because of unicode. Please look in TVwithAUDIO.spin

What would eliminate the 60HZ hum from the audio out ? I suspect a capacitor but have no idea what specs.

Charlie

MagIO2

When no audio is played, the pin is no longer output. So the signal on TV side will be free floating. Simply define the dira of the same pin in the main program to output, keeping outa low and the hum should dissappear.