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Subject: Designing a Pulsewidth-Adjustable DC Squarewave

Date: 02/09/03 at 5:45 PM
Posted by: Gene
E-mail: gcoryell@hotmail.com
Message Posted:

Hello All,

My first time posting here, and on any electronics forum for that matter. Does anyone out there have any experience or can anyone point me in the right direction to design a simple circuit that will be used to supply 12 V DC current to a fuel injector for cleaning in an ultrasonic bath? The quick details of such a circuit would be that I need the device to simulate the electrical input that the vehicle would normally provide the injector. For example, I would like to be able to adjust both the width of the "on" (12 V applied) cycle as well as the width of the "off" (no voltage applied) cycle. I don't know yet what the minimum and maximum duty cycle of this on/off cycle will be, or the frequency. As a first guess, the maximum frequency should be near the limit of rpm of a normal engine...say 6000 rpm...since I'm dealing with a 4-stroke engine, the injector maximum firing frequency should be about 3000 rpm or so. Any suggestions? I am a chemical engineer, and I know that such a circuit is so ridiculously easy to design and build, but I just have no experience with any kind of circuit design except for one course in college where we studied basic engineering circuit analysis...Thevinin, Norton, Superposition, KVL, RLC, AC circuits...etc.....never studied anything digital though.

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