In the figure we have a good rectangular signals generator with several frequency bands. The circuit is based on old logic but can be implemented with modern equivalents.
Found in American documentation from the 90s, this circuit passes frequencies above 1 kHz. The...
This circuit for high impedance microphones has a low impedance output. The circuit is from a...
The Texas Instruments TPA3100D2 integrated circuit (www.ti.com) consists of an efficient class D...