Found in an Electronic Design from the 90s, this circuit uses components from that time and can supply voltages of 5 V with current up to 100 mA.
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...