This circuit drives symmetrical loads through a single transistor. The circuit is from a Radio Electronics from January 1993. The power depends on the MOSFET used.
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...