Universal Triac Control with Optocoupler
by P. Marian in Various |
This universal triac controller circuit with optocoupler solves the problem that triacs have when functioning at low temperatures (triac needs higher gate current) by adding a transistor at the output of the optocoupler circuit. The transistor amplifiers the trigger pulse coming from the optocoupler and the gate current is...
Time Delay Switch with Triac
by D Mohankumar in Power supply |
This time delay switch circuit is useful to switch on an AC load such as lamps after the delay of three minutes. This protects the load from inrush current and transients at power on which may be detrimental to the device. The time delay switch is directly connected to the AC lines to derive power to the components. Resistor...
Backyard Lamp Circuit
by D Mohankumar in Lights |
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. The circuit has transformerless power supply and a timer based switching...
Flashing Light with Triacs
by P. Marian in Lights |
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...
Optimizing the Triacs
by D Mohankumar in Power supply | Theory |
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. Triacs are the most common semiconductor devices used in power control and switching...
AC Motor Speed Controller Circuit
by Received by Email in Various |
This triac-based 220V AC motor speed controller circuit 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...
AC Drill Speed Controller Circuit
by Received by Email in DIY | Various |
This AC drill speed controller circuit schematic allows to control the holing speed of your borer or driller machine. This project is based on the fact that if the load grows, the voltage decrease and current increase. Use this circuit to control the speed of your drilling mill or bench drill. Drill Speed Control Circuit...
Automatic Bathroom Fan Controller
by P. Marian in DIY |
This automatic bathroom fan controller 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...
Light Chaser Circuit
by P. Marian in Audio |
This light chaser circuit (music-operated lighting effect generator) comprises five sets of 60W bulbs that are arranged in zig-zag fashion. The bulb sets glow one after another depending on the intensity of the audio signal. No electrical connection is to be made between the music system and the lighting effect generator...
Electronic Lamp Dimmer Circuit
by P. Marian in Lights |
This electronic lighting dimmer circuit is used to control the lamp for arbitrary brightness. This electronic lamp dimmer circuit work for incandescent lamp, not a fluorescent one. The dimmer circuit here work for both 110V and 220V AC. The dimmer circuit is wired in series with the lamp, you can say the dimmer circuits is...