Speed-Control Switch Circuit Circuit
The circuit employs a center-tapped transformer rated for 240 volts, which serves as the primary power source. This transformer splits the AC voltage into two equal halves, providing the necessary input for the two silicon-controlled rectifiers (SCRs). The SCRs are positioned in a configuration that allows them to rectify the AC voltage into pulsating DC, which is then supplied to the load, identified as MOT1.
The UJT (Unijunction Transistor) ramp generator, designated as Q1, is integral to the operation of the SCRs. It generates trigger pulses that are essential for the SCRs to turn on and off at specific intervals. The ramp generator operates by charging a capacitor through a resistor until a predetermined voltage level is reached, at which point a pulse is emitted. This pulse is fed into the gate terminals of SCR1 and SCR2, enabling them to conduct and control the flow of current to MOT1.
The design ensures that the SCRs are triggered in such a manner that they effectively manage the power delivered to the load, allowing for precise control over the output characteristics. The use of a center-tapped transformer in conjunction with the UJT ramp generator provides a robust solution for converting AC power into a usable form of pulsating DC, suitable for various applications. The overall circuit design emphasizes reliability and efficiency in power management. A center-tapped 240-V transformer is used with two SCR devices to provide rectified ac (pulsating dc) to MOT1. Ql is a UJT ramp generator used to generate trigger pulses for SCR1 and SCR2. 🔗 External reference
Related Circuits
This alarm system utilizes a loud police siren to deter potential intruders. Activated by a single clap, the circuit triggers the alarm for three minutes, which is adequate to alert nearby residents. The design incorporates a sensitive clap switch...
The Astable Multivibrator, which is generally used as a signal generator, is once again used here to generate the desired frequencies. It is an excellent example of the fact, how versatile simple basic electronic circuit can be. It seems...
This precise one-pulse-per-second clock is constructed using a few common components and is driven by a 50 or 60 Hertz mains supply without a direct connection to it. An audible beep or a metronome-like click, along with a visible...
This LED flasher circuit utilizes a 555 timer integrated circuit (IC). The circuit diagram is straightforward and requires only a few external components. When operational, the red LEDs will flash sequentially at a predetermined frequency, similar to the indicators...
This is a hobby circuit designed for electronics enthusiasts that can turn on and off devices such as lights, fans, and radios in response to the sound of a clap. The sound is detected by a small microphone, which...
The circuit voltage source VREF excites the sensor bridge. The excitation voltage VEX is defined as VREF (1 + R1/R2), where the bridge is connected at both ends. The sensor bridge circuit is designed to convert a physical quantity, such...