The circuit presented was obtained in a technical documentation from National Instruments. The low-consumption circuit supplies a common LED with a voltage of just 1.5 V.
Found in Ferranti's 1969 documentation, this circuit can be mounted with a modern equivalent...
It is possible to design a monostable multivibrator around a voltage comparator of the four...
This circuit found in a 90s Popular Electronics, triggers a huge array of LEDs from the sounds...