This timer, like the previous circuits, uses a currently uncommon integrated circuit. The time is given by capacitor C1 and R2 which has the range of values indicated in the diagram.
We found this circuit in the Linear Applications Hanbook of the National Semiconductor in 1994. The...
This capacimeter was obtained in European documentation from the 1980s. The indicator instrument, a...
This circuit triggers a load when the sensor detects humidity. The triggering point is adjusted by...