Hi - I need to generate a square wave. A slow one. It does not need to be accurate at all. But I would like the wave to be as crisp as possible, as it'll be a clock for a shift register. 5V output. Adjustable via pot. Cost sensitive. Not programmed. I'd like the circuit to cost a dollar or less in single quantities.
Is this possible? LM555 is the best idea I've had so far. But add in pot and other components and my budget is being pushed. Cheaper is better.