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plz do tell me therotically how to make a ckt using a pnp
transistor to operate a 24V relay. push button,diodes,
resistors,capacitor and one pnp transistors are available.
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Answer Posted / chandrajith o
circuit the pnp transistor in common collector mode.emitter directly shorted to Vcc ,use appropriate resistors to provide the potential divider bias for the base.connect the collector to gnd through the series combination of appropriate resistor,relay and pushbutton.when pushbutton is switched on ,the collector current which is approximately same as the emitter current flows,ther by the relay will be energised.use the diode parallel to relay to overcome the freewheeling effect.
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