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HA1377 Bridge Amplifier BCL cap 17W (Car audio)
Posted on Wednesday, November 17, 2010   •   Category: Amplifiers


This is circuit Car audio Amplifier(Bridge Amplifier BCL) , It use IC HA1377, Supply Volt 12V-13V. Speaker 4 OHM. Nice Circuit and Easy to Build.


DC13.8V to DC250V Inverter Circuit
Posted on Wednesday, November 17, 2010   •   Category: AC / DC Innveters


I have done a lot of work with valves in recent years. For me valves have many advantages, least of all the price; since they are now "obsolete" it is quite easy to get hold of them for next to nothing at rally's and junk sales. I recently purchased a couple of hundred battery valves for less than SEK1 (US$ 0.15) each. The biggest problem with valves is the PSU needed to provide +250 vDC and 6.3 vAC for the filaments. The transformers are no-longer available at a reasonable price, but a pair of 12v-6v-0v-6v-12v mains transformers will do the job just as well. For portable use only one transformer is required together with a pair of power transistors such as 2N3055 etc.


FT232RL Arduino Programming Board
Posted on Monday, November 15, 2010   •   Category: USB Interface Adapters


This is simple FT232RL programming board for Arduino.


Low Cost USB to TTL for MCUs
Posted on Monday, November 15, 2010   •   Category: USB Interface Adapters


One of the most common way to interface a microcontroler to a computer used to be serial port. But right now, serial port have been replaced with USB on most computers. A common way to fix this issue is to use a USB to TTL converter or a USB to RS232 converter + MAX232.


Infra Red Vision System for a Toy Cars
Posted on Monday, November 15, 2010   •   Category: Remote Control


This is the project of infrared vision system for a toy car. It will project 2 modulated IR beams ahead and detect any reflection of these beams on any obstacle ahead of the car. The circuit will then invert the car's motor for a given time thus changing the direction of advance as it goes in reverse. No special control for steering is necessary as the car has the front wheels' shaft in an eccentric support: when going forward it auto aligns itself, when running backwards the shaft turns and the car describes a curve.


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