Two 6p1 power tubes are used for stereo class A output, and the output power is dual 2-3W. Since the 6p1 tube works in pure class A, the sound quality is sweet, and the actual undistorted volume is eq'...

The figure shows a high-sensitivity, high-volume anti-theft alarm circuit. This alarm is suitable for orchard anti-theft alarm. It is very sensitive and loud, and has a strong deterrent effect on thie'...

This indicator does not change the original structure of the air conditioner. It adopts the current transformer detection method, which has no effect on the air conditioner and no additional power con'...

When starting up the computer, you are required to turn on external devices (such as headphones, cameras, digital cameras, monitors, laser printers, etc.) first, and then turn on the host. When shutti'...

Improved motor control circuit. The above figure is a specific solution for solving the above problem. In the circuit shown in the above figure, CK is a double-position control relay modified by using'...

The DC motor drive circuit composed of LG9110 is shown in the figure below: Among them, LG9110 pins ① and ④ are the positive and reverse control output terminals, pins ② and ③ are the positive power s'...

The circuit is shown in the figure above. lC is a D flip-flop CD4013 (a CD4013 can form two electronic touch switches), forming a bistable circuit. M is the sensing electrode sheet. When you touch it '...

QMR1/QMR2 is a miniature UHF receiver module that uses a unique QM (Quasi AM/FM) design. The transmitter modules used with it are QFMT1-xxx/QAMT2- xxx...

The circuit directly oscillates to an operating frequency of 144 to 148 MHz without using a frequency multiplier. The oscillator is phase-locked with the crystal to ensure the stability of the oscilla'...

As shown in the figure, it is a ±200mA current pump circuit. R1 and R2 are low temperature coefficient resistors with a power dissipation of 0.32W, R8, R10, and R11 are 10-turn precision potentiometer'...

As shown in the figure, it is a positive and negative peak detection circuit with hold control composed of SMP04 and op amp. Amplifier A is used for positive peak detection, and amplifier B is used fo'...

The buzzer coding and radio transmission circuit composed of YN5103 is shown in the figure below. S1~S6 in the circuit are buzzer button switches, and the states of address input terminals A0~A5 can b'...

In this article, we will introduce how to implement a bipolar LED driver circuit using 8051 microcontroller. The difference between a bipolar LED and a regular bi-color LED is that a bipolar LED has o'...

Piezoelectric accelerometers are commonly used in vibration and shock testing. These devices are ideal for measuring high-frequency acceleration signals found in hydraulic and pneumatic disturbances, '...

As shown in the figure below, the AC power input is filtered by T1 and divided into two outputs. One goes to the step-down transformer T3. A bidirectional thyristor KS is connected in series in the pr'...

The figure shows an adjustable voltage stabilized power supply with voltage of 1.5-9V and current of 0.2A. It is composed of diodes VD1-VD4 for rectification, transistors VT2 and VT3 for compound adju'...

The voltage controlled oscillator is a key circuit in the frequency synthesizer. When making amateur radio communication equipment, in order to make the local oscillator have a smaller phase noise and'...

A simple automatic charging device was designed and manufactured. Working principle: The circuit is shown in the figure below. GB is the battery to be charged. When it is not used, the charger plugs X'...

In fact, you can make it yourself. The cost of materials is only more than 10 yuan (a color TV remote control and a small circuit board). After the materials are prepared, the modification can be comp'...

This device can sound an alarm when the device is abnormally hot and cut off the power supply of the device at the same time. The abnormal temperature detection is divided into three levels, namely 40'...