Free Electronic Circuit Design
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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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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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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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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Running/Chasing LED Circuits on The Web Running LED circuit, or sometimes called LED Chaser circuit, has very popular implementation using 4017 integrated circuit (IC). Almost all electronic websites has the circuit in their list of schematic diagram collection, you can check this dancing light circuit for example. The circuit based on that IC, is very flexible since its speed can […]
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Introduction Classic series relay flasher circuit usually need minimum wattage for the connected load to work. Beyond the specified minimum wattage, then the flasher will not work or become unstable. Here I designed a simple solution using DPDT relay, that works for loads with any wattage. The Circuit and How It Works The circuit need one DPDT relay, two resistors […]
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A flasher circuit with only three components (relay, capacitor, and resistor) is very popular design, which is advertised as the simplest design for relay flasher. I don’t know who is the designer of this circuit but the schematic diagram is spread on many websites. Here is one example, using 12V relay, 220Ω, and 2200uF capacitor for building 12V flasher circuit. […]
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Lamp Flasher Circuit Lamp flasher circuit is an electronic device that control a lamp to flash in periodic manner. Lamp flasher can be designed using semiconductor or other active components. Here we use two relays as the active components, plus some other passive components. Relay can be considered as an active component since it receives small power input to control […]
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