Found in a 1944 publication, this compact micro-tube amplifier was powered by two batteries. The circuit uses a crystal microphone and a sensitive dynamic earphone.
2-Tube Hearing Aid Amplifier (T896E)
- Details
- Written by: Newton C. Braga
Found in a 1944 publication, this compact micro-tube amplifier was powered by two batteries. The circuit uses a crystal microphone and a sensitive dynamic earphone.
