The frequency sensitive resistor used in conjunction with the wound rotor three-phase asynchronous motor has a shape similar to that of a reactor with an iron core, but the iron core is made of iron p'...

By utilizing the characteristics of the star connection, when the three phases are unbalanced or a phase is lost, a voltage is generated between the star point and the ground. This voltage is used for'...

S9018 single-tube super-regenerative FM receiver circuit, the most basic receiver circuit, simple FM receivers are made with these circuits

The whole machine is powered by four No. 1 batteries connected in series, so there is no worry about power outages. In addition, the power-saving design means that the batteries only need to be replac'...

Use one wire to control two contactors. In the reversible control circuit, two wires are generally required to control the coils of the two contactors to complete the forward and reverse rotation of t'...

The alarm separates the detection and alarm parts. One alarm can have multiple detection heads. The detection and alarm parts communicate using radio waves. It is divided into the wireless alarm recei'...

R5 is a miniature UHF receiver module developed by RF Solutions of the UK. It is used together with the transmitter module T5, and the receiving distance can reach more than 300 m. It is suitable for '...

The RXM-433/418/315-LC-P series modules are low-cost, high-performance surface acoustic wave (SAW)-based AM receiver modules. The transmitter modules used with them are the TXM-315-LC (31...

The breakdown of common-mode input mainly refers to the breakdown of the collector junction of the input stage. Here, the μA301 integrated operational amplifier is used to illustrate its failure and p'...

As shown in the figure, the LED acceleration and deceleration motion display composed of CD4017. (a) is the acceleration motion display circuit. Among the four light-emitting diodes connected to it,

An electronic microphone first converts various sound signals into audio electrical signals, which then modulate the high-frequency signal generated by the electronic oscillator. Finally, the high-fre'...

This is an integrated voltage-stabilized power supply with continuously adjustable output voltage. The output voltage is continuously adjustable between 1.25-37V, and the maximum output current can re'...

The circuit is shown in the figure. It consists of temperature detection circuit, voltage comparison circuit, power switch circuit, frog sound circuit, AC step-down rectifier circuit, etc.

The author designed a current expansion circuit based on this idea. This circuit is based on a 1A linear charger model CN3056, and is composed of a current expansion circuit and a control circuit.

The circuit diagram of the wireless FM microphone is shown in the figure below, where the LC parameters are important factors that determine whether the circuit oscillates and the transmission frequen'...

The attached figure is a circuit diagram of a small DC motor speed control used in tape recorders and toys. In the figure, the inverter N1 is connected to form a multivibrator, whose frequency or peri'...

The temperature adjustment range of the household constant temperature incubator described in this article is 30℃-60℃. The control circuit is novel and the temperature control accuracy is high. It can'...

The picture below shows the lower limiting circuit. Its circuit is basically the same as the upper limiting circuit. The only difference is that the direction of diode D1 is exactly the opposite. When'...

Power amplifier circuit composed of TM2001A