Low frequency signal generator '' GNCHR-2 ''.
Instruments for adjusting and controlling the PTA.The GNCHR-2 low frequency signal generator has been produced since 1988. The generator "GNCHR-2" (Low Frequency Generator of the Radio Amateur 2nd version) has small dimensions and weight (200x60x92 mm, 500 g) and a modern appearance. It is made on the KR140UD1B operational amplifier according to the classical scheme with a Wien bridge. To improve the load characteristics, an emitter follower on the KT602B transistor was introduced into it. Amplitude stabilization is provided by TPM-2 / 0.5A thermistor. The range of generated frequencies from 20 Hz to 200 kHz is divided into four sub-bands. The frequency setting accuracy of 1 kHz is no worse than 10% (at other frequencies it is not standardized). The maximum amplitude of the output signal at a load of 1 kOhm is not less than 2.5 V. The output signal level can be adjusted smoothly and in steps (decrease by 10, 100 and 1000 times). The error of the step dividers does not exceed 10, 15 and 25%, respectively. Harmonic coefficient no more than 0.7%. The generator is powered from a 220 V AC mains through a built-in rectifier. Power consumption does not exceed 6.6 W. The generator price is 40 rubles.
