Making a signal generator with UPC1651, wireless microphone ----- UPC1651 SIGNAL Generator

Keywords: Making signal generator with UPC1651, wireless microphone Making signal generators with UPC1651, wireless microphone As shown in the figure, IC1, C1 forms a low frequency oscillator of 400 Hz; IC2, C3 constitutes a high-frequency oscillator of about 37MHz; modulation of the high frequency signal by the low frequency signal output from the C2. C4 and antenna constitute a transmitting system. Harmonics of high-frequency oscillators can display a black and white compatible strip signal in a television three-channel reception (or other channel). A point, the B point output signal, respectively perform the detection source of low frequency and image channels, respectively. The C3 is converted into quartz crystals to stabilize the oscillation frequency, as shown in the figure. If a pair of attachment or socket is used at C3, C3 is replaced by a crystal; the frequency is selected from 465 kHz, 10.7 kHz, 6.5 kHz, 4.43 MHz, 37MHz, can be used, the intermediate frequency signal source of the TV. Frequency wireless microphone The circuit is as shown. This circuit uses the UPC1651 integrated circuit produced by Japan NEC as the primary device, which is high and the work is stable, thereby ensuring the high performance of the microphone. Use it to form a FM transmit circuit. It uses a 40-50cm soft mockt as antenna, the effective emission distance is greater than 30m. Carefully adjust the L-spacing and fine-tuning capacitance, allowing the emission frequency coverage to be 88--108MHz. Figure 1 diameter 0.51mm enamel wire is formed from a diameter of 4 mm cylinders.

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