This circuit was obtained from a 1980's QST magazine. The circuit can generate 1 to 15 MHz signals with 1 Vpp at 50 ohms load. Used transistors are still common today.
This circuit eliminates hiss and other noise from audio sources by cutting frequencies above 10...
A four-bit analog-to-digital converter [A/ D or ADC] can be built using one 4066. An 8-bit...
Taken from a 1967 RCA publication, this circuit maintains a low current in the battery when it is...