# Overall description
The design is a one-hot circuit based on the 555 timer. I needed it at work for two different uses, so I made it somewhat flexible.
You may choose to use the LDO from Micrel, or you may choose to drop it and use a 0R resistor instead. In both cases, it is possible to use a diode to protect the circuit form wrong polarity on the input power. The LDO solution offers adjustable output voltage.
The input is made to be used with a push-button, but I'm sure most of you can figure out other ways to trig the timer. It requires a negative edge.
The output is attenuated using a potentiometer and some optional resistors. This gives a good control of the output voltage. If very good control of output voltage is required, use of an LDO is recommended. The attenuated pulse is buffered in an unity-gain opamp circuit, and finally, the output signal passes through a resistor and capacitor that can be used as current and/or DC limiting dev