This is a low-gain amplifier to operate as a booster. We found it in an American documentation from 1947. The circuit uses a coupling transformer at the input.
This circuit is from a 90's publication but uses components that are still common in our market....
This RF preamplifier for the 450 MHz band was found in an amateur radio documentation from the...
This low hysteresis circuit was obtained from old documentation. The circuit must be powered by a...