This circuit from Motorola is from 1968, appearing elsewhere on this site. The transistors admit equivalent and the relay is of the sensitive type for low voltage, according to the power supply.
This well-designed phase shift oscillator configuration was found in ancient European...
A stereo digital mixer using the 4053 is built as shown in figure bellow. The IC must be powered...
The resistors R determine the frequencies of the oscillator together with C. The circuit is from a...