Tag Archives: circuit

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Cat detection/repellant device – Timer delay circuit for motion detection system

Posted on November 6, 2006 by max

Well here’s a cool little cat detection and repellent device using a sprinkler controller and some timer delay circuits.  I think there’s a lot of timer delay circuits, especially the 555 being used for a lot of these DIYs, but I think it would be easier to do with BASIC controllers… OR you can probably just buy a

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Cool Robotic Chair

Posted on October 31, 2006 by max

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Watch this robotic chair re-build itself!

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Open Flame Physics Experiment, Ruben’s Tube

Posted on October 18, 2006 by max

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This Ruben’s Tube will mimik your music with sine wave fireworks…awesome!

Watch standing waves being seen as open flames…

via wohba

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DIY – Controlling a DC Motor over Ethernet with the DAC Circuit

Posted on October 13, 2006 by max

Here’s a cool diy on a DAC circuit to control a DC motor with your PC over the internet using Visual Basic Winsock.

The circuit that I chose for this assignment is the motor project. The DAC circuit will be used to control the speed of a DC motor. This can be done by creating a Visual Basic program to interface with the motor and the PC. The input from the client will be in decimal form (0 – 255) and these digital sequences will be converted into binary codes (analog form) by using the

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DIY Circuit – Blinking LEDs for eye props

Posted on October 13, 2006 by max

Here’s a cool circuit for making your blinking eyes on holloween using the 555 timer chip. This chip is very useful for a lot of applications.

The eye blink circuit consists of a timer and light emitting diodes, which function as the eyes. The timer circuit for the blinking eyes is based on the 555 timer. Figure 1 illustrates the standard timer circuit. The resistors and capacitor on the left control the charge and discharge of the circuit, which runs the pulse rate and duty cycle of th

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DIY Lightning strobe for Halloween projects

Posted on October 11, 2006 by max

Lightning strobe for your Halloween projects or any scary shows!

via Make

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DIY Circuit – 1-Channel Light Organ for 12V Bulbs

Posted on October 8, 2006 by max

Here’s a cool DIY circuit for those of you making party lights for your halloween show.

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DIY Circuit – Car Battery Charger

Posted on September 23, 2006 by max

Here’s a cool car battery charger diagram.

This very simple circuit uses a transformer ,two diodes , a capacitor and an ammeter. To charge a battery just connect the + and – terminals of the circuit to the corresponding terminals of the battery. When the battery is not charged, the ammeter reading shows 1-3 amps. When the battery is fully charged the ammeter reads Zero or nearly zero, after which the battery should be removed from the charger.

via electr

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Circuit – DIY Water Level Indicator

Posted on September 21, 2006 by max

I found some cool looking circuits at this website here’s one of them that detect levels of water by shorting…kinda nifty~

This circuit not only indicates the amount of water present in the overhead tank but also gives an alarm when the tank is full. The circuit uses the widely available CD4066, bilateral switch CMOS IC to indicate the water level through LEDs. When the water is empty the wires in the tank are open circuited and the 180K resistors pulls the swi

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