Found in Radio Electronics from the 90s, this circuit has several outputs with different pulse times. The circuit is CMOS and can be powered by voltages from 5 to 15 V.
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...