This circuit causes an LED to flash at a frequency determined by the capacitor. The circuit is powered by only 3 V and can be used for signaling.
This different circuit uses a relay as an oscillator, whose frequency is determined by C1, and to...
This filter has a cutoff frequency of 0.026 Hz given by R and C. These components can be...
Indicated by Popular Electronics, in an edition of the 90's, this circuit seems doubtful because of...