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本文介绍由业余品TTL与非门组成的高、中、低频信号发生器。它具有价格低、体积小、用途广等特点。工作原理:如附图所示,与非门G_1、G_2、G_3和R_1、C_1等组成频率为465kHz的中频自激多谐振荡器,其优点是起振可靠,振荡频率比较稳定。与非门G_4、G_5和R_2、C_2等组成低频1500Hz自激多谐振荡器,从C_1输出低频信号。该低频信号还通过与非门G_6对中频信号465kHz进行调制。然后经C_3输出,作为收音机的中频信号源。由于被
This article describes the amateur products TTL NAND gate composed of high, medium and low frequency signal generator. It has a low price, small size, wide use and so on. How it works: As shown in the figure, an intermediate frequency self-excited multivibrator with a frequency of 465kHz as the non-gates G_1, G_2, G_3, R_1 and C_1 has the advantages of reliable starting and oscillation and relatively stable oscillation frequency. NAND gate G_4, G_5 and R_2, C_2 composed of low-frequency 1500Hz self-excited multivibrator, low frequency signal output from C_1. The low frequency signal also modulates the intermediate frequency signal 465 kHz through the NAND gate G_6. Then the C_3 output, as the radio IF signal source. As it is