This is a precision ±15V regulator designed on a single side PCB. The original project is based on EB-802 and belongs to zerosoft. The author took the original project and modified it by replacing some of the components with others that are easy-er to find on the market.
The board has a really nice symmetry design and fits nicely into a case. You could use the regulator to power a pre-amp or a headphone amplifier with great results.
+/- 15V Power Supply: [Link]
Were starting to see more and more green designs, which is nice, some people are really concerned about the planet we live in. The PowerBox is part of the Cornell University student projects 2008, and its main goal is to calculate and report the following parameters:
- Real power
- Apparent power
- Power factor
- RMS Voltage
- RMS Current
- Frequency
- Energy usage (Kilowatt-Hours)
All of the data is gathered by a C application which shows real time graphs and data display. Another feature of the PowerBox is that it features a remote switch that allows the computer to turn the power on or off and set wattage limits for auto shutdown. This way people can monitor and control their energy usage. Good job Cornell students.
Monitor And Controll Your Energy Usage With PowerBox: [Link]
Do you like the magnetic power cord connectors on the Apple’s notebooks ? well you can do you own magnetic connector, according to this instructable. Why a magnetic connector ? just remember how many times you tripped on your notebooks power cord, and if you’re not one of the lucky ones you’d probably had your notebook smashed. The instructable is presented in detail so it should be easy to follow.
DIY Magnetic Power Cord Connector: [Link]
The author started building this project to replace the failed power supply in he’s Heath Warrior amplifier. By reverse engineering some Dell computer supplies, he soon had a rough schematic diagram sketched out. Here is a short description on how this power supplies work: When the supply operates on 120 Volts, half of a full wave bridge rectifier charges a pair of filter capacitors to + and - 150 Volts, respectively.
These voltages are alternately switched across the primary winding of the power supply transformer by a pair of transistors connected in a “totem pole” configuration (A half-bridge” circuit.) The secondary windings produce various voltages which are rectified, filtered and distributed to the loads in the computer. Samples of the +5 and +12 volt output are used for feedback to the voltage regulator circuitry.
After some building and thinkering, the project was finished. The power supply was tested, and was able to handle 1KW of power by lighting 10 x 100 w lightbulbs.
DIY Power Supply able to handle 1 KW of power: [Link] - [Via]
This motor speed controller powered by the PIC16F873 detects and controls the rotational speed of the motor. When lower than the specification speed, it increases a control electric current. When higher than the specification speed, it reduces a control electric current. It is possible to use when wanting to keep constant speed even if the load to the motor changes.
DC motor speed controller: [Link] - [Via]