This low noise microphone preamplifier circuit was found in American documentation from the 90s. The circuit requires special care with the layout. The power can be between 9 and 18 V.
With the name of transitube we find this MW receiver in documentation from the 50's. It uses a...
This type of circuit is interleaved between a microphone and a transmitter in order to improve the...
We found this circuit in an Electronics Now magazine from June 1995. The transformer has a primary...