TRANSISTORRTYPE DC POWER SUPPLY SWITCHING CIRCUIT

摘要

PURPOSE:To supply the DC power to the load circuit with no loss of the switching element by connecting the collectors of 1st and 2nd PNP-type switching transistors to the load each. CONSTITUTION:Change-over switch 12 with one end earthed is connected to the base of PNP-type switching transistor Tr10 via resistance 11; common DC power source E29 is connected to the emitters of Tr10 and PNP-type switching Tr13; the emitter of PNP-type switching Tr14 whose collector earthed is connected to the base of Tr13; the collector of Tr10 is connected to the base of Tr14; and the load is connected to the collectors of Tr10 and 13 each. As a result, the switching timing can be set freely without any voltage loss.