> 4116 datasheet specs 2mS, my calcs give a refresh period of 1.5mS, the 14.5uS > from the manual would give 1.86 mS, 7% shy of 2. > The schematic specs 1% resistors, and the parts list does appear to spec a > high-tolerance "1%200PPM" cap. > > Although there are the internal voltage divider Rs in the 555 which are also > critical for the timing and everything is 40+ years old. > > Idle speculation at my distance, we'll see what Fritz observes.
Brent: 11.8us, 6.4us position Manual: 14.5us, 6.0us positive Actual: 15.2us, 8.5us positive So yeah, a little pokey there...
