Electronic circuit schematics

This is a circuit design for a doorbell that produces a bird-like sound. The circuit is controlled by an NPN transistor. The operation of the circuit begins when P1 is set to an experimental value, starting with approximately 220...

The ECM circuit comprises four sections, as illustrated in the block diagram. A power converter generates a voltage that correlates with the actual real power consumed by the load. This voltage supplies both a bar graph and a voltage-to-pulse...

The circuit illustrated in Figure 3-178 is designed for controlling the speed and torque of a motor used in a continuous casting machine. It consists of the main circuit, a trigger circuit, and both manual and automatic control signal...

This metal detector circuit needs to be powered using a 9 volts power supply (DC) or a 9 volts battery. The C1 capacitor is a variable capacitor with a value of 365 pF, C2 is a 100 pF silver...

This page features basic, visible light photo-detector circuits that can be used to detect trains. These methods would normally be used with the photo sensor mounted between the rails. The described photo-detector circuits are designed to detect the presence of...

The basic circuit illuminates up to ten LEDs in sequence, following the rhythm of music or speech picked up by a small microphone. The expanded version can drive up to ten strips, formed by up to five LEDs each,...