This circuit was found in General Electric's 1965 documentation. It appears elsewhere on the site. The SCR and the diodes must be in accordance with the motor current.
We found this regenerative receiver with JFET in a documentation from the 1980s. L1 has a primary of...
This circuit was found in a 1973 publication. With the components indicated, the range can be from...
Found in Linear Technology documentation from the 90s, this circuit uses an operational amplifier...