Monostable 555 Circuit for High Input Triggering Timed Low Output Pulse

The discussion addresses designing a monostable 555 timer circuit that triggers on a high input pulse to produce a timed low output pulse, effectively the inverse of the common low input triggering a timed high output. Solutions include using an inverter such as the 40106 Schmitt trigger to invert the output signal. Another approach involves employing a transistor-resistor network: a small NPN transistor (e.g., BC548) with a 10 kΩ resistor to condition the input signal feeding the 555 trigger pin, and a transistor (e.g., BD147) with a lower-value resistor (around 470 Ω) at the output stage to provide sufficient current drive for the low output pulse. For logic-level outputs, a 10 kΩ resistor and a 1 kΩ pull-up resistor to supply can be used if the load lacks a pull-up. Reference to a comprehensive article on typical 555 IC circuit applications was also provided for further guidance.
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