This is a two-input audio switching circuit. The operational can be of any type and more entries can be added. The power supply must be symmetrical.
This circuit recognizes the tone programmed in an oscillator 555 when inserted into a slot that...
This circuit is based on the Texas Instruments LMC662 and has the function of monitoring the audio...
This circuit for crystals from 100 to 500 kHz was found in an American documentation from 1954. The...