Found in documentation from the 1980s, this circuit uses an operational amplifier from that time. Transistors are also from the era, and general-purpose equivalents can now be used.
Found in American documentation from the 90s, this CMOS circuit detects the source of a signal and can...
This circuit is from a 1964 Electronic Design. The transistors are from that time. They can be...
This circuit was found in 1960s Radio Electronics. The circuit uses components from that time. The...