Free electronic circuit design and schematic diagram
Simplicity, low cost and improved efficiency when compared with the alternative options are the reasons why the switchstart circuit has been widely adopted. Moreover, the 230V mains voltage is sufficiently higher than tube running voltage to let the use of the simple series impedance ballast in almost every case. Where the mains voltage is not high enough, for example in […]
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This is circuit of soft light dimmer. This circuit uses the IGBT STGP10N50A and the TS555 timer as main components. Here is the circuit: The timer is triggered on the zero crossing voltage pulse. The time constant determined by C5/R14+R15 that is used to determine the conduction angle. The T2 – T3 inhibits the power switch until the auxiliary supply […]
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This is an application that can be used to adjust LED brightness while maintaining superior color quality. This application uses pulse width modulation (PWM) dimming technique. This application can be used for single-line scrolling displays, transportation road signs, simple scoreboards, ever-expanding advertising markets encompassing convenience gas stations, shops, stadiums, and stores. Following figures shows color shift caused by analog dimming, […]
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This is a circuit of self-writing LED display sign controller. This circuit consist of eight power shift register which are installed in cascade. The shift registers are used to turn on a string of 64 lamps or LEDs sequentially. Here is the circuit : When the shift register clock (SRCK) is clocked, the register is clocked, so that the display […]
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Based on a request by FreeCircuitDiagram reader Helynn Schufletowski, here we present an AC powered-LED flasher circuit for all of you! DEADLY ELECTRICAL SHOCK WARNING: This circuit is not isolated from mains supply, don’t touch it when it’s plugged to the power line. The circuit is based on our previous transistor LED flasher circuit, but we added a transformer-less ac […]
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LED flasher circuit here will flash a LED using only 1.5 volts supply voltage. Normally, to make any LED lamp works, you need more than 2 volts power supply. This because LED will work only when the supply voltage is higher than its forward bias voltage, around 2 volts for red LED, and slightly lower for other color (but still […]
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This LED flasher give similar circuit with the previous transistor LED flasher, but this circuit use a 555 integrated circuit chip as the active component. Here is the schematic diagram of the LED flasher circuit: This circuit gives alternating LED flashing, but with different flashing period between LED 1 and LED 2. The ON period of the LED 1 is […]
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