triac circuits
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Backyard Lamp
Feb 24th
This circuit lights the backyard of your home at 10 pm and stays on till morning. It helps to provide light in the back yard to avoid nocturnal animals and even prevents an attempt of theft. It is fully automatic and uses an LDR as light sensitive switch.
Flashing Light with Triacs
Feb 8th
This flashing light circuit uses triacs to generate an intermittent light with variable frequency. Additional components are the D1 diode and semi adjustable potentiometer R2. The trigger capacitor C1 is increased from 0.1 µF to 220 µF so that the triacs can be ordered for several successive periods. C1’s loading time is longer, so that the lamp flashes with one pause of several periods.
Blinking frequency can be adjusted with P1. Semi-adjustable potentiometer R2 regulates the current gate. This setting affects the lighting duration of the lamp because it also establish the C1’s discharging time. (more…)
Optimizing the Triacs
Dec 19th
Modern power control systems utilize electronic devices like Thyristors for power switching, phase control, chopper etc. These devices also find applications in inverter design, brilliance control in lamps, speed control of motors etc. Optimizing the Triacs
D.MOHAN KUMAR (more…)
Motor speed regulator with triac
Nov 11th
This triac-based motor speed regulator is designed for controlling the speed of small household motors like drill machines. The speed of the motor can be controlled by changing the setting of P1. The setting of P1 determines the phase of the trigger pulse that fires the triac. The circuit incorporates a self-stabilizing technique that maintains the speed of the motor even when it is loaded. (more…)
Auto Bathroom Fan control
Jun 20th
This auto bathroom fan control circuit design is a lamp and fan motor control with a delayed switch off. This automatic fan control is commonly used in toilet and bathrooms. When switch S1 is closed, the fan motor and the lamp turns on. When switch S1 is opened (switched off), the lamp goes out but the fan motor will keep running for another 3, 6 or 1 minutes linger (set by S2). This delayed switching off of the fan ensures that the unwanted odor is really fanned out the toilet. (more…)
Sound activated lights
Apr 25th
This sound activated lights circuit turns a lamp ON for a short duration when the dog barks (or a relatively strong sound) giving an impression that the occupants have been alerted. (more…)
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