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.
This logic gate that increases the duration of input pulses was found in a NASA documentation from 1966....
This circuit is quite old, from 1964, but can still be mounted with BC558 transistors. The circuit is...
This circuit allows the control of audio signals from a DC signal obtained from a simple switch. We...