Filament source (T398E)

Despite being transistorized, this is a constant current source circuit for 1 V valve filaments such as the 1H4 tube.

Phase Splitter (CB4239E)
From an audio signal, this circuit gets two signals of the same amplitude and opposite phases....
Emergency Light (CB16649E)
This simple emergency light circuit uses few components and a standard 12 V car or motorcycle...
Linear Ramp Generator MC1455 (CB14585E)
The integrated circuit used is equivalent to the 555 and the transistor can be the BC558. R1 and...