We found this circuit in an Electronics Now from the 1990s. The circuit crashes when light strikes the sensor. Instead of the alarm a relay can be used to drive higher power devices.
A sub temperature sensor circuit with the Norton LM3900 amplifier is shown in the figure. R3 has...
The presented circuit consists of a double phase shift oscillator capable of generating two sine...
This circuit appears in other articles in this section, but it is very interesting. It is a...