This small amplifier with 3 transistors can be used both as a stethoscope and as a spy. The circuit uses a small output transformer of the type found in old transistor radios.
Super Ear (CB20418E)
- Details
- Written by: Newton C. Braga
This small amplifier with 3 transistors can be used both as a stethoscope and as a spy. The circuit uses a small output transformer of the type found in old transistor radios.
