Found in a 90’s Popular Electronics, this circuit uses a component that can be difficult to obtain today. It achieves a 10 dB noise reduction with the indicated components.
This circuit incorporates a thermostat. The circuit is from Motorola's Linear Interface ICs from...
We found this circuit in a technical documentation from the 70s. The MC1555 is nothing more than...
This circuit was found in a 1967 RCA manual. The transistors are of the time. The adjustment is made to...