We found this circuit in a 1977 National Semiconductor Databook. The circuit can use other FETs like the BF245 and has an input impedance of 10 megohms. The circuit gain is unitary.
We found this circuit in a 1994 National Semiconductor technical documentation. The circuit can be...
In the figure we have a basic PLL circuit with the LM567 or equivalent. The circuit is from a 1977...
This circuit was obtained from a Linear Technology manual from the 1990s. The sensor is of the...