We found this circuit in a 70s Electronic Design documentation. The circuit uses general-purpose transistors from the time. Linearity is better than 0.25%.
This circuit has several features, such as timing to activate and deactivate, in addition to a...
We found the circuit below in the Linear Applications Handbook by National Semiconductor. The...
This primitive solar radio was found in a Gernsback publication from 1960. The transistor is made...