Love test game circuit by 8 LED circuit with explanation

This circuit uses the nand gate IC number is 4011B per Clock signal generator circuit, feeding it with the pin number 14 of the IC counter circuit 4017B.When you press and hold the switch S1 C1 will discharge. Causing current flow through D1 as a result, IC1 work.Clock generator and input to IC2. IC2, which will make the incoming signal. Then display the output from the Q0-Q7 step on the moon, run to the speed of the clock entered.When the switch S1 will IC1 stop source clock input to pin 14 of IC2, the IC2 of the clock will not count. As a result, the output is displayed on a LED lamp or lamps.We can use this circuit as a circuit game in love, by assigning to each LED on the moon has a different meaning with the author as if never hug, love much, etc. Let’s be friends.

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Slave Flash Trigger circuit with explanation

The flash that is built into digital cameras is designed for indoor photography. At subject distances of greater than five meters or so, the light is usually not powerful enough to take a satisfactory picture. Unfortunately most such cameras do not include a shoe for an external flashgun, and so a light-triggered slave flash is called for. The flash built into the camera produces a very rapid change in light intensity which is picked up by a photo-transistor in the slave.

The pulse is transmitted via C1 to the transistor, which then briefly shorts the contacts on the slave gun together. The sensitivity of the device can be adjusted using P1. The circuit can be connected to the shoe contacts of the slave flashgun using a coaxial cable, or, with space permitting and a nimble bit of DIY, can be built inside it. The circuit is not suitable for use with flashguns which have a voltage of more than 20 V across the trigger contacts, or with cameras that emit a number of ‘preflashes’ before taking the picture proper.

Read more : http://www.extremecircuits.net/2010/05/slave-flash-trigger.html

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Smooth Flasher Circuit Diagram with explanation

Ordinary LED flashers turn the LED on and off abruptly, which can get a little irritating after a while. The circuit shown here is more gentle on the eyes: the light intensity changes very slowly and sinusoidally, helping to generate a relaxed mood. The circuit shows a phase-shift oscillator with an adjustable current source at its output. The circuit is capable of driving two LEDs in series without affecting the current.

The frequency is set by three RC networks, each of which consists of a 100 µF capacitor and a 22 kO resistor. Operation is largely independent of supply voltage, and the average LED current is set at about 10 mA. The circuit adjusts the voltage across the emitter resistor so that it matches the base voltage of the first transistor (around 0.6 V). The phase shifting network gives rise to the oscillation around this average value. In the prototype of this circuit we used an ultra-bright red LED.

Burkhard Kainka
Elektor Electronics 2008

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