This circuit with germanium transistors was found in a publication by Gernsback from 1960. The circuit is low power, a few tens of milliwatts.
This isolated shield is from an old documentation, making use of an operational one of the time. It...
This circuit prevents the passage of frequencies in a range starting at 1 kHz and can be adjusted...
For greater safety, a 140-ohm resistor must be included with the instrument in to avoid...