This circuit is from 2005 documentation. The integrated amplifier circuit must be mounted on a good heat sink and the speaker must be able to withstand the full power of the circuit.
Found in documentation from the 1980s, this circuit can be used with other operational ones. The...
This circuit was published in the December 1987 Radio Electronics magazine. It uses two 555s to...
This circuit identifies the polarity of DC signals and if the signal is AC. The circuit is from...