Found in a 1980s American documentation, this circuit has a current consumption of only 1 mA. The crystal can be from 100 kHz up to a few megahertz.
Counting up to numbers lower than 10 [between two and nine] can be done by connecting the n+1...
This circuit was found in a 1967 General Electric manual. It shows a SCR control with unijunction...
August 2017 - This Maxim component, available from Mouser Electronics, is ideal for wearables,...