This low power circuit was obtained from an American 80's documentation. The circuit indicates the voltage of a battery being trimmed by the trigger point. The transistors can be the BC549.
We found this circuit in a 1967 Electronics World. It analyzes a transistor by determining its...
The transistors of this amplifier for 8-200 headphones may be the BC548 or equivalent to replace...
In the year of this project (1997) Walkman were common, but this unit can be used in the car with...