Wien Bridge
This Vienna bridge oscillator generates a sinusoidal signal whose frequency depends basically on C2 and C4. The circuit is from an Electronics Now from December 1993.
The figure shows how to implement an alarm buzzer in an LM3914 to warn about crossing the scale...
This circuit can act as a shield being controlled by a microcontroller by pin 1 or 2. The...
This circuit was obtained from a 1980's QST magazine. The circuit can generate 1 to 15 MHz signals...