This circuit was found in a Popular Electronics of the 1980s. The microammeter may be the lowest current range of a multimeter. The antenna is telescopic.
This circuit can switch signals in the 3.5 to 30 MHz band. We found it in a QST magazine from the...
This circuit was found in a 1987 edition of the United States' Hands On Electronics magazine. The...
With the circuit shown, when the brightness of one lamp decreases, that of the other increases. There is...