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 DIY Super Bright LED USB Laptop Light.

Wednesday, May 21st, 2014

Now I’m very busy because During this semester’s new son and charge new school. So It must be very adaptable. Sleep faster. And Youngest daughter began to grow and frequently wake up at night to milk. I have to take the laptop to work on the bed always. But the lights are turned on, while […]


 Mini car inverter 60watts using CD4047 and BD249

Tuesday, May 20th, 2014

The 12 volts of Car battery and converted to AC 220V 60 watt. Then apply to appliances easily. And portability easy with Because of the small. In circuit we use CD4047 and BD249 as main part so is mini circuit. The working principle. When we connect the 12 volts in to the circuit. The IC1 […]


 install ffmpeg ubuntu 14.04

Monday, May 19th, 2014

Hi, friends I borrowed space on the blog, to record remember protection. About installation FFMPEG for Ubuntu 14.04 I can not install it with Ubuntu software center. So have to exert use little terminal. then type: sudo apt-add-repository ppa:jon-severinsson/ffmpeg sudo apt-get update sudo apt-get install ffmpeg and wait….. Eventually usable, I like ffmpeg because fast […]


 Simple DC to DC step up converter using TDA2822

Sunday, May 18th, 2014

This is a simple DC to DC step up converter circuit which can increase input voltage of 3-12 volts into 4.5-22 volts at current 1-300 mA. It use small audio amplifier IC as main and use principle doubler voltage 2 times with diode and capacitor only without coil or transformer. So this circuit is easy […]


 220V AC siren circuit

Friday, May 16th, 2014

This circuit is a simple siren circuit that use 220V AC as power supply. It is small size and use a piezo speaker cause use low power and saving. How it works This circuit is shown as Figure 1 which we use power source by reducing AC-voltage of 220 volts down by the resistors-R1, R2 […]






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