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The signal passed by the antenna WA, is detected by diode VD1, and the selected low-frequency signal is amplified chip DA1. The unipolar power of the chip. The gain is adjusted by the variable resistor R5. The output devices are connected arrow indicator for visual control of the level and radiation or head phones to work in monitor mode.

Pointer-type measuring head must be a current full deflection of 1 mA and resistor limits not less than 1 Ohm. The chip is desirable for use with field effect transistors at the input, such as COD.

Diode VD1 necessarily germanium, type D9, DG 507.

Antenna WA-copper wire with a length of 30 cm.

Author: tolik777 (aka Viper); Publication: www.cxem.net