This sensitive 5-band circuit was found in a September 1995 issue of Electronics Now magazine. The headphones, for greater sensitivity, should be high impedance.
This one-digit photometer using CMOS circuits was found in a 1989 documentation. The circuit is...
This circuit can function as a simple shield converter from BCD to analog outputs. The circuit...
In the figure we have a different configuration for an oscillator with the 555. This circuit was...