Found in a Raytheon manual from the 1960s, this simple amplifier uses a metal rod attached to a crystal transducer to detect vibrations. The phone is high-impedance magnetic.
Vibration Amplifier (CB21900E)
- Details
- Written by: Newton C. Braga
Found in a Raytheon manual from the 1960s, this simple amplifier uses a metal rod attached to a crystal transducer to detect vibrations. The phone is high-impedance magnetic.
