This circuit is from a 60's documentation. The circuit uses components from the era and serves to monitor a 150V continuous power line.
A Schmitt trigger inverter can be obtained from each gate of the 4093 with the connection shown in the...
This charger can be used with one to four AA, AAA, C or D cells. The maximum current is given by R...
This circuit, which can use a reed sensor, is indicated for doors and windows. The circuit was...