This circuit uses a 4069 inverter (inverter converts DC power (battery, storage battery) into AC (generally 220v50HZ sine or square wave). Emergency power supply, generally convert DC battery into 220V AC. In general, the inverter is a device that converts direct current (DC) into alternating current (AC). It consists of inverter bridge, control logic and filter circuit. It is widely used in air conditioners, home theaters, electric grinding wheels, power tools. , sewing machine, DVD, VCD, computer, TV, washing machine, range hood, refrigerator, video recorder, massager, fan, lighting, etc.) IC, a frequency multiplier (frequency multiplier) makes the output signal frequency equal to the input signal A circuit with an integer multiple of frequency. When the input frequency is f1, the output frequency is f0=nf1, and the coefficient n is any positive integer, which is called the frequency multiplication. The frequency multiplier is widely used, such as the transmitter can use the frequency multiplier to make the main oscillator Oscillation at a lower frequency to improve frequency stability; frequency modulation equipment uses a frequency multiplier to increase the frequency offset; in a phase keyed communication machine, the frequency multiplier is a weight of the carrier recovery circuit The signal is applied to the input of N1. It should be a duty cycle with CMOS logic compatible with approximately 50% (depending on the peak-to-peak voltage of 3 - 15V) square wave. The input signal is buffered and N1 inverted, and inverted with N2, so outputs A and B and N2 are the phase of the square wave signal of N1 180 °. The output of N1 is different from the output of C1 and R1 and N2 is different by C2 and R2, making the two spike waveforms C and D, phase 180 °. The signal is buffered, inverted and N3 and N4 shaped. Then these combinations are combined in a NOR D1, D2 and R3 and N5 gates, and finally N6 is inverted twice the frequency input signal. This circuit will operate over a wide frequency range. As the component value shows a pulse width of 500 ns at points E and F, the output duty cycle will reach 50% with a frequency of 1 MHz when the input frequency is 500 kHz.
The sound quality of small speakers is also good. It does not have the same large speakers and power as HIFI speakers, and its sound quality cannot compete with large speakers due to physical limitations. But for the vast majority of users who are not golden ears, the use of small speakers with tablets and mobile phones is sufficient to meet their hearing needs.
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