This Wien bridge oscillator was found in Radio Electronics from the 90s. The circuit uses the 741 which is a current component. The circuit requires a symmetrical power source.
Using a 4046 PLL this circuit generates rectangular signals in three wavebands that depend on the...
This circuit that uses a mechanical tuning fork was found in Radio Electronics magazine from June...
This circuit is from an Italian publication called Fare Elettronica from 1987. What we have is an...