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This is a short-range light barrier designed for use as an intruder alarm in doorposts and similar applications. The 555 timer in the transmitter oscillates at approximately 4.5 kHz. The short-range light barrier operates by utilizing a transmitter and a...
A simple proximity detector circuit utilizing the NE567 integrated circuit (IC). The circuit activates an LED when an object approaches the sensor. The NE567 is a versatile phase-locked loop (PLL) device commonly used for applications such as proximity detection due...
The simple battery charger circuit design presented here utilizes the versatile IC 555 as its primary component. This circuit is capable of charging various types of rechargeable batteries within the specified limits outlined in the article. The battery charger circuit...
A practical voice-activated switch is presented. An A1 amplifier is connected to a conventional microphone (B) that picks up the audio control signal, which is then amplified. After amplification, the signal passes through components C5, VD1, and VD2, forming...
The Wien bridge oscillator is a high-stability audio frequency sine wave oscillator known for its simplicity. An oscillator is defined as a circuit that generates periodic electric signals, such as sine waves or square waves. Applications of oscillators include...
This circuit is a digital voltmeter diagram featuring an LED display. It is designed for measuring the output voltage of a DC power supply. The voltmeter incorporates a 3.5-digit LED display along with a negative voltage indicator. It is...
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