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20 Aug 2010

This project shows how to build a DC-DC converter that converts 12V to 18V and is able to power the load with 5A. It can be used when is necessary to raise the voltage and power a load from a 12V battery. Output voltage can be set from 12V to 26V to power various loads. The circuit is based on UCC37322 and TL3843 ICs. Features are:

  • Output current: 5A at 18V (10A momentary)
  • Input voltage: 10 to 15V DC
  • Operating Frequency: 40kHz
  • Effectiveness: 95%
  • Output voltage: 12 to 26V
  • Maximum output power 100W
  • Protections: low voltage 9.2 V in IQ, over current (10A) on the F1 circuit, polarity D2 and F1 on the circuit

12V to 18V 5A DC-DC Converter – [Link]

20 Aug 2010

This project shows how to build a N type MOSFET tester that will help you find out if a MOSFET is working or not. The circuit is really simple and uses only a few components. Check schematic and building diagrams on the link below.

N-type MOSFET tester – [Link]

20 Aug 2010

This project shows how to build a DC current regulator for 12V Halogen Lamps. In 220V AC voltage is easy to control the brightness of halogen lamps but in DC it is more complicated. The circuit works by varying the pulse width of a square wave of about 125Hz. Pulse width is varying using a potentiometer between 1% to 90%. Features are:

  • Output current: 10 A at 12 V (20 A momentary)
  • Input voltage: 10 to 15V DC
  • Operating Frequency: 125 Hz pulse width between 1.47% to 87.8%
  • Effectiveness: 97%
  • Output voltage: 12 V
  • Protections: over current (10A) on the F1 circuit, polarity D3.

DC Current Regulator for 12V halogen lamp – [Link]

20 Aug 2010

This small project shows how to build a ON-OFF switch that is controlled from a single PUSH-BUTTON and is able to operate any load with a push of a button. Features are:

  • Input voltage: Between 5 and 18V
  • Output current: 10A
  • Activate: external positive pulse or short-circuiting the terminal CN2
  • Protected against double pulses and rebounds

ON-OFF with a Push-Button – [Link]

20 Aug 2010

This project is a power adapter that is able to convert any PC ATX PSU to an adjustable laboratory power supply ranging from 0V to 20V.  Characteristics are:

  • Output current: 4A-12V 2A-20V
  • Input voltage: multiple PC ATX 2.0 connector
  • Operating Frequency: 40kHz
  • Effectiveness: 90%
  • Output voltage: between 0V to 20V adjustable, auxiliary +12 V and-5V
  • Protections: over current (4 A) in IC2

0V to 20V adjustable power supply using ATX PSU – [Link]

20 Aug 2010

Kenneth Finnegan build a Bicolor LED clock based on MSP430. Project is developed using low cost Launchpad development platform from TEXAS Instruments. The MSP430 microcontroller is designed for low-power battery applications. The clock is controlled using a push button and a toggle switch. To display the time the LED is flashing in two different colors. Green flashes mean 10, yellow 5, and red 1, so the time 5:28 would be displayed as YELLOW [PAUSE] GREEN GREEN YELLOW RED RED RED (5:10+10+5+1+1+1) [via]

MSP430 Bicolor LED Clock – [Link]

20 Aug 2010

This project shows how to convert a GameBoy to an Analog meter using a PIC microcontroller. Project is powered from PIC24HJ128GP502 microcontroller and Gameboy is loading appropriate software from the PIC not a cartridge. Ken Kaarvik has also made other GameBoy projects found here. [via]

GameBoy Analog Meter – [Link]

19 Aug 2010

This project shows how to build a 8 channel remote control that can be used as radio control or infrared depending on components. Each device output can be configured as momentary or latch and each remote control can have it’s own unique address. The remote unit is based on PIC microcontroller you can find schematics on the link below.

DIY remote control based on PIC – [Link]

18 Aug 2010

4dsystems.com.au has released four Arduino Shields that make it easy to interface Arduino with 4DGL uOLED displays. The units come complete with display module, a 5 way multiswitch joystick and male headers that help connect the 4Display-Shield to the Arduino boards. The four units are:

4Display-Shield: Interface Arduino with uOLED and LCD displays – [Link]

18 Aug 2010

Picture-Axe project is a sound activated camera flash that is able to help you take some really impressive pictures. It is built around a Picaxe microcontroller, it has a sound detection circuit and a silicon controller rectifier (SCR) to drive a flash directly. [via]

Building a sound-activated camera flash – [Link]





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