This amplifier is from Motorola's 1990 Linear Databook. The circuit can be used with operating amplifiers with the same characteristics and the power supply must be symmetrical.
This circuit can be used to measure the frequency of a low frequency square signal. The signal can be...
This circuit was published in an English magazine from 1977, but it can be easily assembled since...
We found this circuit in an old documentation. What it does is flash two LEDs when night falls or when...