This circuit has a duty cycle of 50%. We found it in old English documentation. The center frequency is around 1 kHz.
When a voice signal enters this circuit, the volume of the music being played automatically...
This circuit for 3.3 V logic circuits has a 5 V input and the maximum output current is on the...
We found this circuit in Motorola's 1990 Linear Databook. The component used is unusual. The...