The frequency change of some college campus radios is a headache for many teachers and students. The original 72MHz is changed to 52.5MHz, and the radios bought by teachers and students cannot receive'...

This wireless microphone has a reasonable circuit design, beautiful shape, long sound transmission distance, long service life, economical and practical, low power consumption, and is suitable for use'...

If the automatic power-off switch introduced in this article is installed, the electrical devices will automatically be in a power-off state when the power is restored after a power outage. Only manua'...

The power-on delay output low level circuit is shown in the figure below. When the circuit is connected to the power supply, since the capacitor C has no time to charge, the ② and ⑥ pins of the 555 ti'...

The circuit of the timer reminder is shown in the figure. It mainly consists of three parts: (1) timer charging circuit; (2) main delay circuit. It uses the characteristics of CM0s integrated circuit '...

As shown in the figure, the frequency divider circuit can be triggered for sine waves, square waves or positive pulses as long as the peak value reaches between 0.5 and 5V. The operating frequency of '...

This capacitor charge and discharge curve demonstrator uses a time base integrated circuit 555 and a small number of peripheral components to form an oscillator with a duty cycle of about 50%. By cont'...

This circuit consists of a multivibrator and a power amplifier circuit as shown in the figure. The frequency-adjustable multivibrator composed of NE555 and peripheral components generates a frequency-'...

The preamplifier can be NE5532 or LM358. NE5532 has a static power consumption of 10mA, while LM358 only consumes about 1mA. Most people cannot tell any difference in sound quality. Therefore, LM358 i'...

The RXM-433/418/315-LC-S series receiver modules use a high-performance surface acoustic wave (SAW) architecture to achieve superior characteristics in terms of size, efficiency, and cost. The series.'...

MC33493/D is a UHF transmitter that complies with the ETS1 standard and is suitable for data transmission in the 315-434 MHz and 868-928 MHz frequency bands.

TX500 is an ASK wireless data transmitter module. It uses PLL frequency stabilization technology and is widely used in small area wireless data communications, such as wireless meter reading systems. '...

As shown in the figure, this is a unity gain buffer circuit composed of MAX4100/4101. This circuit uses a small resistor (24Ω) placed in the amplifier feedback loop to form a unity gain buffer...

Many new devices are equipped with headphone connectors. However, due to the highly integrated and miniaturized design, there is not much space left for the headphone amplifier, which requires the cor'...

The attached figure is a circuit diagram of a small signal AC amplifier with a power supply voltage of only 1V and a gain of 5 times. NIV7015 is a CMOS operational amplifier produced by New Japan Wire'...

As shown in the figure, this is a pocket electronic timing hypnotic massage circuit composed of two 555 timers, which can meet people's leisure and health needs. The circuit consists of three parts: t'...

The left picture is the internal circuit block diagram of CXA1034P/1034M, and the right picture is its typical application circuit.

The constant current power supply method is an ideal LED power supply method. It can avoid current fluctuations caused by changes in the LED forward voltage. At the same time, the constant current mak'...

The 4-range 3 3/4-digit digital voltmeter circuit composed of ADD3701 is shown in the figure. The 4 ranges are 400 mV, 4V, 40 V, and 400 V. Unless otherwise specified, the resistors in the figure are.'...

To meet the CCFL startup and operating voltage requirements, the CCFL inverter output is connected to a high-frequency step-up transformer, and the step-up ratio is often 60-100. When CCFL is used as '...