The oscillator may include several switching transistors to provide channelized operation and, if necessary, a buffer amplifier may be added.

This article introduces a "temperature and clock display instrument" composed of AT89S52 single chip. The circuit has simple hardware structure, concise program, low cost, flexible use, and is very su'...

The MAX2369 is a complete dual-band, tri-mode transmitter chip for cellular phones. It is suitable for tri-mode or dual-mode mobile phones, satellites, wireless data links (WAN/LAN...

MC3363 is a VHF narrowband, low power and double conversion FM radio chip. The main technical features are as follows: ?Input bandwidth is 200 MHz (using internal...

The figure shows a typical circuit of LM4809/4810 for dual-channel headphone amplifier. The left and right channel audio signals are input into the 2 and 6 terminals of LM4809/4810 (SOP/MSOP package) '...

As shown in the figure, this is a stereo amplifier circuit with Av=200 (gain) composed of LM1877. The two input audio signals are coupled to the LM1877 by two 0.1μF capacitors respectively...

Here we introduce a practical LED automatic emergency lighting circuit, which uses 24 light-emitting diodes connected in series and parallel and then on standby. It can automatically light up 24 LED l'...

Compared with the traditional voltage-stabilized power supply, the digitally controlled DC power supply designed in this paper has the characteristics of convenient operation and high voltage stabilit'...

The author uses 89C2051 single-chip microcomputer to make a four-way digital display water level automatic controller. The circuit schematic is shown in the attached figure. The circuit consists of fi'...

For this circuit, I use BG1--D40 and BG2--C1970, which has a very good effect. The voltage is 12V, the working voltage of BG1 is 6V, and the distance is 3000 meters (orientation experiment).

The standby circuit of the ATX power supply provides 5V to the USB and TL494 chip power. RCC circuit form, very typical circuit.

There are two key points in production. One is the selection of input transformer. In order to ensure the performance of the whole machine, it is recommended to use finished products. The model used i'...

The smoke alarm is composed of an infrared light-emitting tube and a photosensitive triode, and the circuit is shown in the attached figure. When the monitored environment is clean and smoke-free, the'...

Here is the circuit diagram for the lantern dimmer/strobe designed by Tony Van Roon: There are two circuit modes: dimming and flashing. The flash mode is useful for warning other drivers of your troub'...

Working principle of the circuit: The circuit of this light-controlled automatic street light is a capacitor step-down and bridge rectifier circuit composed of capacitors C1, C2 and diodes VD1~VD4, an'...

The circuit principle is drawn according to the actual object as shown in the attached figure. The number of components is the same as that of the circuit board. This circuit belongs to a half-bridge '...

The circuit of a single flashing lamp is shown in Figure 1. It belongs to the Rc oscillation circuit. Its working principle is: when the power is turned on, the current charges C1 through RP, and the '...

When S1 is pressed, the thyristor is turned on, and the DC voltage output from the secondary of the transformer provides the control current. Even if S1 is released, the thyristor remains turned on. A'...

I planned to use PlatformIO with the Arduino framework, but PlatformIO does not support this board (XIAO-RP2040) yet. So I used the ArduinoIDE.

This is a simple schematic diagram of a multi-tone siren alarm circuit. This multi-tone siren is effective for reverse horns, anti-theft sirens, and many other sirens. It produces five different tones'...