Simple field indicator
Encyclopedia of radio electronics and electrical engineering / Field strength detectors
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The signal received by the WA antenna is detected by the VD1 diode, and the selected low-frequency signal is amplified by the DA1 chip. The power supply of the microcircuit is unipolar. The gain is controlled by a variable resistor R5. At the output of the device, a pointer indicator is connected for visual control of the level and radiation or headphones for working in the monitor mode.
The pointer measuring head must be with a total deflection current of 1 mA and a loop resistance of at least 1 kOhm. It is desirable to use a microcircuit with field-effect transistors at the input, such as K140UD8.
Diode VD1 is necessarily germanium, type D9, GD 507.
Antenna WA - copper wire 30 cm long.
Author: tolik777 (aka Viper); Publication: cxem.net
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