Hearing Aid Amplifier (CB18348E)

Details
Written by: Newton C. Braga

 

This amplifier or stethoscope with headphone output and using a crystal microphone was found in a Japanese magazine from the 1960s. The circuit is battery powered and makes use of a high impedance magnetic headset.

 


| Clique na imagem para ampliar |

 

 

 

  

Buscador de Datasheets


N° de Componente 

Circuit Bench

  • Metronome (CB18215E)

      This simple metronome, from 1985 documentation uses only transistors and has two settings. For...

  • Doorphone (CB16544E)

      We found this circuit in a 1988 documentation. The circuit uses a conventional complementary...

  • Water Level Control (CB16953E)

      This circuit was found in a 1990 publication. The sensors are electrodes placed in the water tank...

Latest