This circuit was found in a Signetics documentation from the 1980s. Next to the figure are the waveforms of the generated signals. The transistor admits equivalent.
This circuit monitors the humidity of a pot or plant bed, providing indication on two LEDs. The...
This circuit is from the 2005 Linear Technology Application Manual. It provides an indication of the...
This circuit activates an old conventional cassette recorder when the telephone line is answered and...