Take two antennas receiving 105.5°E~[176.5°E satellite TV signals as an example, the wiring diagram is shown in Figure 1. In Figure 1, after the two antennas are led down with 75-5 TV cables, a satell'...

When using an electric iron, since the electric iron has no safety protection device, if you are not careful, the clothes will be damaged. For this reason, a safety control circuit is installed on the'...

Working principle: In the figure, K is the power switch, T1 controls a small power transformer, and T2 is the amplifier power transformer. IC1 (S1-S4) is a quad bidirectional analog switch CD4066. Whe'...

The electromagnetic field radiation signal of the AC power supply of the mains can reach a distance of several meters, and these radiation signals can also be sensed by the human body. By using this e'...

The circuit of the AC electronic fuse is shown in the figure below. It is actually an overcurrent protection switch. After the 220V AC is stepped down by the power transformer T, half-wave rectified b'...

The following electron tube amplifier is made of the most common electron tubes. Its circuit diagram is shown in the figure: the front stage uses 6N2 to form an SRPP circuit, which is a "current-regul'...

As shown in the figure, this is a phase-locked frequency multiplication circuit. This circuit can convert the 1MHz standard frequency into a 10MHz reference frequency. The output frequency stability a'...

DKl000T is a transmitter module composed of RF2516 and rolling code encoder. The receiver module used with it is DKl000R. DKl000T is suitable for keyless entry systems, wireless...

RCV420 is a precision current loop receiver designed to convert the input 4-20mA current signal into an output 0-5V voltage. Its circuit consists of a high-quality operational amplifier, an on-chip pr'...

The figure shows the OPA660 common emitter (common-E) amplifier circuit. (a) The figure shows a discrete component common emitter amplifier. The transconductance changes over the entire temperature ra'...

6P15 was originally used for video output of tube TVs, but it was replaced by transistor TVs before tube TVs became popular. It was born at the wrong time, and few people have been interested in it si'...

The circuit shown in Figure 1 is designed to detect continuous differential signals with a minimum amplitude difference of 200 mV and absolute values ??ranging from -7 V to +12 V. The circuit can dete'...

Generally, dynamic LED digital clocks do not have the time-telling function. Here, we only need to add a simple circuit to make it realize the hourly time-telling function. The integrated circuit used'...

When a larger output power is required, a dual forward converter circuit with voltage superposition is generally used, as shown in the figure. Circuit features: (1) Two forward converter circuits are '...

The charger is simple to manufacture, works stably and reliably, and has a wide adjustment range. It does not require high-power and high-current thyristors and can charge any 6V:24V battery. R6 and C'...

The output terminals of V1 and V2 can also trigger the one-way thyristor to make BL alarm. You can also use V3 and V4 to form a simulated thyristor (in this case, V3 is replaced by 8050) to make BL so'...

Here is a simple and practical emergency light. It can automatically switch power supply when power outage occurs. When power supply is normal, it automatically charges the backup battery and has char'...

As shown in the figure, the circuit consists of several circuits including the main power supply, backup power supply, backup power supply automatic control circuit, etc.

This article introduces a simple overvoltage protection device, which can automatically cut off the power once the voltage exceeds the allowable range, and automatically connect again when the voltage'...

This is a simple diagram of a tachometer. The basis of the frequency converter circuit is the current, which converts the input signal into a proportional current measuring pointer device.