This circuit is from a 60's documentation. The circuit uses components from the era and serves to monitor a 150V continuous power line.
This circuit for analogue TV was found in an American 1980s documentation. The transistor can be any RF...
This simple circuit produces a tone when triggered by any vibration picked up by the sensor. The...
This circuit is from a 1980's documentation for telecommunications. The circuit is used in SSB and...