Light guide clock part 8
This is the improved oscillator design by Peter Wendt:
http://www.mcamafia.de/
Update from Peter Wendt:
The 4060 didn’t cope very well with using +9V as AC-ground. The circuit started faster, the over all deviation was lower and the sensitivity against voltage changes was lower – but the circuit was more sensible against stray signals and hand-touch. Trimming it required a long plastic rod and a hand distance of least 10 cm away from the trimmer – or the counter goes erratic. Using GND as AC ground for the xtal circuit the xtal goes into overtone mode – which is not what I wanted. Therefore the “old” design is the better I’d say. The new one has some advantages, but you need a properly designed board.
