This circuit was obtained in a 1980s publication, but it can be easily assembled today, as all components are common. The transformer is 12 + 12 V with at least 1 A and the diodes 1N4002.
Found in a 1980s American documentation, this circuit appears with variations elsewhere in this...
May 2017 - This proximity and touch controller from Azoteq can control 12 mutual channels and can...
This is an old 1988 circuit consisting of a timer or time control for exposing silk-screen arrays. The...