Adjustable Frequency Flip-Flop Circuit Using Inverter Gate

This flip-flop circuit uses one potentiometer and one capacitor as the frequency determining components. The assembled circuit is shown in the Figure 1, and the schematic diagram of the circuit is shown in the Figure 2. The circuit consists of one integrated circuit of inverter gates (4069 CMOS or  74C04), one electrolytic capacitor, two resistors, two LEDs, and one potentiometer. […]

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High Voltage (220VAC) Bass-Treble Automatic Disco Light Controller

The previous music-controlled disco light controllers, the audio-controlled disco light controller circuit and hi-lo (treble-bass) disco light controller have some features and drawbacks. The first one features high voltage drive, enable the circuit to drive 220VAC lamps, and the drawback is that it has only one way (single channel control). In the other side, the second version has two-way (bass […]

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Low Power Consumption Indicator with Blinking LED

Low Power Requirement of Indication and The Solution Visual indication using light emitting diode becomes very common, because LED technology offer many benefits: low power consumption, durable, and cheap. Some indication must be able to draw strong attention, or at least it must be very clear to read whether its state is on of off. In some application, the requirement […]

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High Voltage 220V AC Lamp Flasher Using 555 IC

Similar with previous high voltage  flip-flop circuit, this circuit controls high voltage (powerline) bulbs (220V AC). Instead of using transistors, this circuit uses NE555 integrated circuit, a very popular chip for timer or oscillator application. The required low voltage supply for 555 IC is provided by direct converter, made up by D1, R1, DZ1, and C1. This low voltage is […]

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Hi-Lo (Treble-Bass) Disco Lamp Controller

Using high (treble) and low  (bass) frequency  beat detection to control stage lamps can produce automatic light jockey for disco or any music performance. Instead of using general level of music signal to control a disco lamp, the circuit presented here uses two separate channel to give more complex variation of light flashing pattern. The dynamics of music signal is […]

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Low DC Voltage (12VDC) Fluorescent Tube Lamp Circuit

A fluorescent lamp, also called a fluorescent tube is a tube with electrodes filled with  low pressure mercury-vapor, utilizing fluorescence to generate visible light.  The excitation caused by electric current in the gas of  mercury vapor generate short-wave ultraviolet light. There is phosphor coating inside the tube an the  ultraviolet light then make this coating  glows.  Conversion of electrical energy into […]

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Audio-Controlled Disco Light Controller Circuit

Using some active and passive components, we can build a simple audio-controlled disco light controller circuit.  A standard audio power amplifier output, which usually drive loudspeaker, can used to drive this disco light circuit. With this circuit we don’t need light jockey anymore, because the flashing of the light will be directly controlled by the music signal itself.  The schematic […]

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High Voltage Flip-Flop With SCR and Low Voltage Components

With only few components, we can use resistors, diodes, and capacitor, we can convert line voltage (220VAC)  directly to low DC voltage (10 VDC). This low voltage powers the low voltage flip-flop standard circuit, but this circuit is then used to drive high voltage SCR. This simple high voltage flip-flop circuit can be used to control alarm lamps, bell, or […]

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Music Controlled Disco Light Circuit with Automatic Level Control

Introduction to Automatic Disco Light Control Simple audio or music controlled disco light uses comparator to sense the beat of a music signal, but this comparator has a reference point that should be calibrated according to the music signal volume. It’s easy if we have a light jockey to take the duty of controlling all the lighting, but it’s not […]

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Modular Fastest Quiz Controller Circuit Using Relays

Introduction Fastest quiz controller is basically a switches controller, the switches are then used to control lamps and or alarms, which are designed to make indication of who is the first contestant that push the knob first, so the host can give the question for him. Many circuits of such controller are available on many websites, but here we present […]

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More Complex Chasing Light Controller Using Relays

Producing More Perceptible Light Movement And Lowering The Power Consumption Chasing light controller presented in our previous light controller circuit has very simple design. It control three lamp power lines to make moving light effect by turning on two lamps and turning off one lamp in sequences. Now I have designed new moving light controller circuit which turning on only […]

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Chasing Lights Controller Circuit Using Relays

Chasing Light Controller Using Relays

Introduction to Chasing Light Running lights or chasing light is very attractive for advertisement display. A sequence of on-off at minimum three lamps gives an effect of moving lights. These three lamps then can be extended by paralleling the wire to give long bulbs chain. Modern lighting control system might have micro controller  inside for complex lighting pattern, but here […]

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