This circuit was obtained from an Analog Devices documentation from the 90's. The circuit is for a voltage of 1.23 V and is used in a voltage source greater than 3 V.
The circuits below were found in amarican publication of the year 1958. The transistors are...
With this circuit it is possible to use a control voltage to select audio signals that pass...
This PLL with operational amplifiers was found in 1969 documentation. The configuration can be...