This circuit, obtained from a 1965 magazine, can still be assembled using some modern equivalent components. The transistors may be BC558 and the transformer is obtained from a disused transistor radio.
LTC7841 PolyPhase® Synchronized Boost Controllers Mouser Announces Analog Devices LTC7841...
With this circuit a logic output signal from a microcontroller or other digital TTL configuration can...
The figure shows how to use an oscilloscope for diode test. The circuit presents the...