Indicated on an 80's Radio Electronics, this circuit provides at its output a voltage that is the peak value of the input voltage. The supply voltage must be higher than the expected peak.
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...