Obtained from an English publication in the 1980s, when a weather station operated in that country at 60 kHz, this circuit employed only two general-purpose transistors.
Found in American documentation from the 90s, this configuration detects the direction of rotation...
This amplifier with a 9 MHz passband and 10 voltage gain with two transistors was found in...
A Schmitt trigger inverter can be obtained from each gate of the 4093 with the connection shown in the...