This circuit is used in star finders. Its function is to detect the battery voltage and estimate the remaining battery power. When the remaining power is about one third, the indicator light will ligh'...

The transmitting system is mainly composed of key addressing circuit, encoding circuit and radio transmitting circuit. The schematic diagram of the transmitting system module circuit is shown in Figur'...

The main component of this circuit ICl is a new type of power grid carrier digital pulse signal transmission modulation/demodulation integrated circuit SST8803, which has the characteristics of low po'...

As shown in the figure, this is a double-sideband modulation and demodulation circuit composed of NE561B. The carrier frequency f0=1MHz is used to input the modulation signal. The AM modulation signal'...

The fan frequency speed regulation circuit realized by 555 timer is an electric fan simulation gust frequency speed regulation circuit, which can add a practical function to the old-fashioned fan.

Working principle of the circuit: U is a 555 time base circuit, which constitutes a multivibrator to generate an alarm signal.

My PV (Photovoltaic) system consists of the following main parts: A solar field consisting of 16 solar modules providing 4300 Wp (Watt-peak) of power; A solar battery charger that converts the 120 V p'...

An IoT-based water management system designed to use remotely controlled water sensors for intelligent database and management.

The circuit shown in Figure 1 solves this problem. Using an external operational amplifier, a small-signal pnp transistor, and a voltage-step-down regulator IC1, a 20V output voltage can be provided f'...

Because the constant temperature soldering iron uses an iron core transformer, which is too heavy and inconvenient to carry, the method introduced in this article is to replace the original iron core '...

The circuit of the indoor TV antenna amplifier is shown in Figure 1. It is composed of only one ultra-high frequency triode. This amplifier is powered by dual power supplies G1 and G2. Its circuit cha'...

The power amplifier circuit made of high-fidelity power amplifier IC TDA1521A has the characteristics of few peripheral components, no need for debugging, and it works as soon as it is installed. It i'...

This is a laptop protection circuit that protects your laptop or netbook from being stolen. Fixed inside the laptop case, it will sound a loud alarm when someone tries to take the laptop.

NE555 precise timing circuit diagram: camera timing circuit diagram; NE555 6 to 60 seconds timing circuit diagram

The bicycle direction indicator circuit operates from a 9VPP3 (alkaline) battery and is basically a set of two independent free running oscillators (astable multivibrators) built around four low power'...

As I am using Boltduino (customized version of Arduino Uno r2), this project can be easily done with Arduino Uno. I made a Fritzing diagram using Arduino UNO for those makers of Boltduino.

Here is the circuit diagram of the Eight Sound Effect Generator. This circuit will produce 8 sound effects, amplify the audio signal and let you hear the sound directly from the speakers.

This is a simple 20W bridge amplifier based on the TDA7240A. This circuit is designed for a car audio system, but you can use this circuit for your small home audio application. TDA7240A is a 20W brid'...

This is the circuit diagram of a LM2596 based DC to DC converter with single input power supply and multi voltage outputs. The input voltage range of this circuit is 15V to 40V.

As shown in the figure is a frequency dividing circuit adjusted by a potentiometer. This circuit uses a serial D/A converter to convert the input data into a voltage value, then compares it with the r'...