Voice signal generator ----- Voice Signal Generator

Voice signal generator, Voice Signal Generator Keywords: signal generator circuit, signal generator production Voice signal generator The signal generator is a powerful assistant for an audio device such as a radio, a recorder, a megaphone. Here is an unique voice signal generator that has the characteristics of small size, power consumption, simple circuit, convenient carrying. I. Working principle The circuit of the voice signal generator is shown in the figure, its core component is a normal voice integrated circuit chip A. When the trigger switch Sb is pressed, A is triggered by a high level trigger signal, and its OUT will repeatedly output the memory "Hey, Hello! Please open the door" voice signal. The signal is used by the probe output by the probe output by the coupling capacitor C. Since the high-end harmonics in the output signal are very rich, the speech signal output by the probe can not only detect the low frequency amplifier circuit part of the sound device, but also detect the intermediate frequency and high frequency circuit parts, which is very convenient. Second, the component selection A Selection of HFC5223 speech doorbell dedicated integrated circuit chips can also be replaced by a sponsors of any model (such as KD-5600 Series, HL-169A Series, etc.) voice integrated circuit chip. R1, R2 all use RTX-1 / 8W carbon film resistors. C is preferred to use a CJ1O-400V type metal-based paper-free capacitor to ensure that it is not broken when the high pressure site (such as tube radio, megaphone, etc.) is maintained. Sb is tightened with a 6mm × 6mm small tuning, and the phosphorus bronze sheet can be used. The probe can be processed with a bicycle spoke of about 80 mm, requiring an insulating plastic tube in a needle. Ground clip with a small crocodile clip. The power source G is formed in series with a two-capable SR44 or G13-A (small 11.6 mm × 5.4 mm), and the voltage is 3V. Third, production and use The entire signal generator circuit is soldered according to the chip of A. The welded movement is loaded into a plastic cylinder of a size of about φ20mm × 55mm (the author is doing the outer shell with the plastic box of the packaging 135 color photographic film, the effect is good), the front end of the cartridge leads to the probe, and the rear end uses 0.6m soft. The plastic wire leads to the crocodile clip and the fixing tact switch Sb is fixed at the appropriate position of the tubular position. This circuit can be put into use without any debugging as long as it is welded. When using, the crocodile clip of the signal generator is sandwiched on the common ground to which the sound device to be inspected, the handheld signal generator and presses the SB button, with the probe to touch the input of the amplified circuit at all levels of the audio device (afterward Level forward advancement is advanced). If there is a normal voice sound in the speaker of the device under test, the measured part of the circuit is good, otherwise it will illustrate a fault.