This circuit is from a Radio Electronics from February 1959. The circuit has a speaker output and good sensitivity. Power is supplied from a 9 V battery.
This circuit inverts the signal of any logic using a general purpose PNP transistor. The supply...
This Industrial Track or overhead crane slows down when it detects more objects. The circuit has a...
This stage of IF to 455 kHz operates with voltages from 1.5 V. We find it in a 90s Popular...