The circuit presented was found in the Linear Applications Handbook of the National Semiconductor of 1994. It is based on a DAC1020 and operational not common today.
The circuit shown in the figure can be used as an indicator of presence and high voltage in a...
This circuit uses the 2N626, the first commercial Darlington transistor. We found it in Radio...
This circuit can generate signals from 80 to 800 Hz with an amplitude of 0.3 V. We find it in a...