police siren using NE555

A frequency generator circuit capable of producing 50 Hz and 60 Hz outputs using a crystal oscillator. This oscillator can be utilized to generate precise frequency signals. This frequency generator circuit employs a crystal oscillator as its core component, which...

The Measured Value and the Setpoint are two inputs to a control system. The Measured Value is the amplified input from a transducer or sensor for a specific parameter that requires regulation, such as pressure or temperature. The Setpoint...

Here's a metal detector circuit that frequencies of the two oscillators are then mixed in similar fashion to BFO, to produce an audible heterodyne. On the surface of it, this design would seem to represent little more than a...

An infrared (IR) sensor or detector circuit diagram utilizing a 555 integrated circuit (IC), primarily employed as a water level or liquid level sensor and proximity detector circuit. The described circuit employs a 555 timer IC configured in a monostable...

The telephone ring generator described generates the necessary aerial voltage using a simple switched-mode power supply (SMPS). It incorporates a CMOS Schmitt Trigger-based oscillator, a 10 mH inductor, a high-voltage switching transistor (such as the TIP47 or another high-voltage,...

To create the circuit, connect a switch as an input and an LED as an output to the Arduino. The components required include a switch, an LED, a 10kΩ resistor, a 470Ω resistor, a blue or yellow jumper wire,...