This audio mixer was found in an old American documentation. The potentiometers are 1M and the input capacitors are 100 nF. The circuit requires power supply voltages from12 to 18 V.
This limiter circuit provides a constant amplitude signal at frequencies of up to 100 MHz. The...
This circuit used in signaling for boats, cars or barriers was found in a 1980s documentation. It still...
With this preamplifier it is possible to use a small speaker as a microphone. The circuit is also...