This circuit was found in documentation from the 80s. It is based on unijunction transistors not very common today being synchronized by the 60 Hz power grid.
This amplifier provides a maximum power of 7 W, depending on the supply voltage. The integrated...
Found in a 90s R-E Experimenters Handbook, this circuit amplifies signals from 100 Hz to 3 MHz....
The gated oscillator in the figure bellow tums on when a “0" Iogic Ievel is applied to its input....