The zero-crossing power regulation circuit introduced in this article is simple but can work reliably. It is suitable for power regulation of various electric heating appliances, power regulation of s'...

The main circuit of the welding machine consists of a power transformer B1, thyristor components SCR1~SCR6, a balancing reactor L1, a filter reactor L2, and a shunt FL. The secondary of the transforme'...

The 555 time base integrated circuit is a digital integrated circuit. It is a timer composed of 21 transistors, 4 crystal diodes and 16 resistors. It has functions such as voltage divider, comparator,'...

For this reason, the author has made a device suitable for the above situation, which can automatically water the flowers and plants when the owner is not at home - a household flower pot automatic sp'...

Generally, there is no protection measure for the water supply circuit of a small-power household water pump. In actual operation, the check valve may leak over time, causing the water pump to run wit'...

The zero-crossing power regulation circuit introduced in this article is simple but can work reliably. It is suitable for power regulation of various electric heating appliances, power regulation of s'...

Due to the needs of teaching work, the power supply lines in schools are relatively complicated. The time controller available on the market can well solve the problem of ringing the bell during schoo'...

The circuit of this device is shown in the attached figure. 1. Working Principle 1. When timer 1 is turned on, the motor is turned on, the curtain is closed, and the curtain reaches the end, the norma'...

HID lamp DC electronic ballast has simple circuit, easy debugging, low cost, and is suitable for amateurs to make. This circuit has excellent constant power characteristics. When the input voltage cha'...

The schematic diagram of the antenna amplifier of the amplification-hybrid mode is shown in the figure below. The TV signals of channels 1 to 12 are input at the VHF input terminal, and a simple low-p'...

MOSFET power amplifier circuits are mainly used in high-power AV circuits. As shown in the figure, this is a 100W MOSFET power amplifier circuit. The input stage of this circuit uses the JEFT input op'...

The figure below is a TTL control signal input circuit diagram for turning on or off a 12V DC motor using a commonly used optocoupler PC817.

As shown in the figure, the single-ended input and double-ended output differential line driver circuit is composed of OPA2662. The circuit in the figure is constructed by using two identical amplifie'...

Veronica FM transmitter is easy to make, has stable performance, pure signal, does not use professional parts and IC, and has auxiliary test function to make you easily debug without professional equi'...

The working principle of this circuit: an AC contactor, two micro switches and a float bracket form a deep water well, or water well, water level control circuit. It has been verified by units and fam'...

Synchronous rectification step-down DC/DC converters all use a controller and an external power MOSFET structure.

When designing a power amplifier circuit, the most troublesome problem is the transistor pairing and zero drift of the differential circuit. If you are not careful, you may even overload the power amp'...

The infrared wireless headset consists of two circuits: a transmitter and a receiver. The transmitter circuit is shown in Figure 1. The sound signal is drawn from the audio output socket of the TV.

The relay is controlled by the microcontroller to engage and release, allowing readers to master the use of relays. Readers can also use the normally open and normally closed contacts of the relay to '...

The receiver introduced in this article only uses an integrated block and a compact high-frequency head with a power supply voltage of +5V. It consumes less power and is easy to carry when going out. '...