555 with stable frequency and low pot currents

Is their an easier way to do this??? im building a servo control circut which will be ran using Digital Potentiometer (MCP41X1) which has a maxium wiper current of 1mA when the pot is brought to its 1%/99%(default state) or its 99%/1% positions it will over amps and burn out to eliminate the extra current on the pot during initial startup i have added a resistor to the wiper. the extra current during the drain cycle I am removing by switching off the V+ to the pot, using a pnp. which also stops my frequency from shifting. but because the 555 chip does not output enough voltage to fully switch off a pnp i use a npn to work the pnp Can someone please explain why i am getting almost 10 volts at the pnp base pin? parasitic capacitance of the transistor junction being charged by the switching action on the 555.

published 7 years ago