Negative rail generator powered by 19 VDC laptop psu

260

03:30:13

PUSH-PULL output stage with transistors operating as switches. Drives Diode Capacitor ladder to produce complementary -19Vdc ( @ 150mA max ) from a 19 VDC laptop charger. The +/- 19 volt rails can power 7815 & 7915 regulators to provide a +/- 15 volt supply for powering opamp circuits. The 20 KHz Squarewave can be generated by any means, 555, logic gates or even a 2 transistor astable.

As there is likely to be a lot more current available from the charger ( mine can supply 3.42 A ) this could be used to generate other power rails like +5 V and +12 V, or even a variable supply of up to around 16.5 V

published 8 years ago

BillyT

8 years ago

Nice circuit, is 1k resistor on output necessary?

gasboss775

8 years ago

Probably not in a real circuit, but the simulation wouldn't work without it.

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.