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This is a bike tail LED light flashing as the planet Bike Blinky Safety. When we use the bicycle(normal bike) at night. we used IC1 IC555 Oscillator s...

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This circuit calls more Free Running Multivibrator work resemble Flip Flop. Which encourage itself repeatedly. The Q1 and Q2 be Transistor PNP be usab...

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This is the simplest circuit you can get with one transistor. Any NPN transistor can be used....

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This the second simplest circuit in the world. This transistor on the left has a gain of about 200 and when you touch the points shown on the diagram...

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This is a novel flasher circuit using a single driver transistor that takes its flash- rate from a flashing LED. Theflasher in the photo is 3mm. An or...

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This circuit alternately flashes two white LEDs, on a 3v supply and produces a very bright flash. The circuit produces a voltage higher than 5v if the...

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The LEDs in this circuit produce a chasing pattern similar the running LEDs display in video shops. In fact the effect is called: "Running Hole." All ...

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The LED illuminates when the piezo diaphragm detects sound. Some piezo diaphragms are very sensitive and produce 100mV when whistling at 50cm. Others ...

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This circuit is slightly simpler than above but it does not have the feature of being able to adjust the drive-current.
The inductor is the same a...

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This circuit will drive 1 high-power white LED from a 12v supply and is capable of delivering 210mA. The driver transistor is BD 139 and the details o...

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This circuit will drive 1watt white LED from a 12v supply and is capable of delivering 300mA. The driver transistor is BD 327 and the inductor is 70 t...

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This circuit automatically turns on and illuminates the LEDs when the solar panel does not detect any light. It switches off when the solar panel prod...

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This circuit drives 15 LEDs to produce the same brightness as a 1-watt LED. The circuit consumes 750mW but the LEDs are driven with high-frequency, hi...

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The circuit illuminates a column of 10 white LEDs. The 10u prevents flicker and the 100R also reduces flicker....

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This circuit flashes when the voltage drops to 4v. The voltage "set-point" can be adjusted by changing the 150k on the base of the first transistor....

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