This configuration was found in an English magazine from 1965. It is valid for any junction FET. The input impedance is 5.5 M ohm higher than conventional stages.
This circuit was found in an American documentation from 1977. The circuit can be implemented with modern...
In this circuit the output voltage depends on the light that falls on the LDR, increasing when the...
This filter with the 741 op amp was found in the February 1995 Electronics Now magazine. The power...