Found in a European magazine from the 1980s, this circuit can amplify signals from 10 kHz up to over 220 MHz with good gain. MOSFET supports equivalents.
This 1 kHz triggered oscillator was found in an Electronics Now from the 90s. The circuit fires off...
This circuit, suggested by an Electronics World of 1969, keeps a blinking LED for a while when a...
This relay circuit with a dual channel MOSFET (not very common today) was found in an old American...