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Actuating a coil with a 555 timer IC

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berry-o

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Hi guys!! I am a hobbyist and my current requirement is to actuate a coil of approx 300mH with the help of a 555 timer IC or an 8051 or atmega8515 AVR microcontroller (as I require variable PWM). definitely I will be needing an amplifier gain stage in between and I am planning to use ULN2003 for it (with paralleled inputs and paralleled outputs for high current gain). can anybody help me in this regard as i am desperate to start working on it. currently i am using a signal generator for signal generation.
ppppppppllllllllsssssss i need help.........
(dont forget that im living in a place where IC s are not easily available, only common ICs are available)
 

Are you actuating a relay coil? Or using a coil to filter 'high' frequency PWM, as in a dc-dc converter?
 

If the coil is DC, put that voltage at one end and a BJT or MOSFET from the other end to ground. Drive the BJT through a resistor or the MOSFET directly. As a safety precaution from the "kick back" voltage of the relay coil. Place a diode in parallel with it pointing to the positive voltage so that the diode is reversed bias under ordinary conditions.
 

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