This third-order Butterworth filter was found in American documentation from the 1980s. Formulas for component calculations are attached to the diagram.
For measurements between 30 and 40º C this circuit was found in the documentation of 1968. The...
The circuit is Motorola's 1974 Unijunction Trigger Circuits for Gated Thyristor. A 2N2646 can be...
We found this configuration in the ON Semiconductor thyristor manual. The triacs depend on the...