This input circuit for an oscilloscope was found in Radio Electronics from the 90s. The operating circuit is from that time, and a modern equivalent can be tried out.
This circuit is suitable for SSB modulation and was obtained from an amateur radio documentation from...
The components of this circuit are from the time of its publication in the 1980s. Modern...
This doorbell or buzzer as announced in a 1990s US publication uses an operational amplifier that admits...