So I built a test board to try and measure some ideas. I added the components for the famous Grundig DEM clocking and it was working fine. Then I though I check it against the data sheet single capacitor solution, I connected a 680 pF foil capacitor between pin 16 and 17. It does not work. There is some low level, high frequency oscillation, but definitely not the well known waveform that should be there. I checked the capacitor, potential solder bridges, continuity, everything looks in order. What did I miss? The chip is in a socket.
Last edited: