This amplifier for recording heads was found in a Radio Electronics from September 1963. The circuit uses period transistors but can be modified to work with modern transistors.
In the figure we have the traditional configuration of a phase shift oscillator that produces a...
This circuit produces an intermittent sound in a ceramic piezoelectric transducer, for example, a simple...
If you have a common analog multimeter, you can increase its input resistance in the measurement of...