This circuit was found in an American documentation from 1969. Indications of the used transistors are not given, but general-purpose types can be tested.
We found this filter in the 1990 Motorola Linear Databook, but it can be implemented with other...
Instead of the lamps, LEDs can be used in series with 470 ohm resistors. The circuit is from an...
This low current solenoid driver was found in an ancient American documentation. The solenoid must be...