This circuit is from a 2004 documentation serving for signals from 1 MHz to 160 MHz. The antenna is of the telescopic type and the analog instrument is of the type found in old sound equipment.
This preamplifier for high impedance microphone is designed to make a good addition to the speaked word...
When the sensor of this circuit is cut for a moment, the second 555 produces a tone for a time...
Here we have a circuit suggested by Texas lnstruments that consists of a receiving stage that has...