Free electronic circuit design and schematic diagram
Classic LED Flasher Circuit This LED flasher circuit is a classic two transistor flip flop. This flasher circuit is very popular and it’s usually the first circuit to build when starting electronic circuit building hobby. Here is the schematic diagram of the famous LED flasher circuit: How LED Flasher Circuit Works The circuit consist of two transistors, two capacitors, four […]
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This circuit is similar with our previous dimmer circuit, but the gate control is full-wave rectified using diode bridge. This circuit can be used to replace electric switch for your incandescent lamp, brushed motor, soldering iron or heater. Here is the schematic diagram of the dimmer switch: Please note that his dimmer switch can only work on AC voltage, it’s […]
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Fluorescent lamp or tube lamp (TL) has good efficiency. This high efficiency feature make it suitable for battery operated lighting application. To drive the tube lamp, we need high voltage to make the gas inside the tube get ionized. Here is the schematic diagram of the fluorescent lamp circuit: To trigger the ionizing process, we need high voltage as high […]
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The high durability nature of a light emitting diode (LED) make it suitable for ON/OFF indicator application. Because the limitation on low operating voltage, LEDs are normally applied on low voltage application. Fortunately, there is a simple method to apply LED indicator for high powerline voltage: reactance of a capacitor can be used to limit the current without dissipating any […]
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Light dimmer circuit is used to control the lamp for arbitrary brightness. This dimmer circuit work for incandescent lamp, not a fluorescent one. The dimmer circuit here work for both 110V and 220V AC. Here is the schematic diagram of the circuit: Dimmer Wiring Diagram The dimmer circuit is wired in series with the lamp, you can say the dimmer […]
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Using a standard fluorescent tube lamp (TL), you can make your own disco light, similar to a stroboscope light. You can even use a half-broken lamp, which one side of the heating filaments has broken. This circuit use only one side heating filament inside the tube. Look at the circuit’s schematic below. Please be aware that this circuit uses high […]
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This circuit is line powered flasher, can be used in any application, and Christmas lamp is one of the example. Look at the circuit’s schematic diagram below: The control for triggering the SCR is done by Q1, Q2 and related resistors. The timing depends on R1,R2 & C1. To change flashing frequency don’t modify R1 and R2 values: set C1 […]
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