This circuit incorporates the passive control of the previous circuit and was also found in the March 1995 Electronics Now magazine. The power supply must be symmetrical.
This circuit encoded audio signals from two sources (stereo) to make their transmission by single FM...
This bird circuit found in several versions on this site uses a light sensor (LDR) firing when the...
This circuit monitors the humidity of a pot or plant bed, providing indication on two LEDs. The...