600 Watt Quasi Amplifier With Mosfet IRFP460 electronic circuit and schematic

ACTK 400/600 Watt
Two copies of the powerful unit is able to provide high powwer for long periods. Actrk400 uses 6 n channel MOSFETs in the output stage to about 400 watts into 4 ohms while delivering Actrk600 12 n channel MOSFETs in the output stage of the power supply more than 600 watts into 4 ohms. It has almost achieved Builder 900 watts with Actrk600 graph using 12 IRFP460 MOSFETs.

Actrk 600W schematic

ACTK 400W Layout

ACTK 600W Layout

 ACTK Power Supply
   Schmatic

  Layout power supply

Final Set up And Adjustment
No attempt should be made to set up or test a power amplifier module that is not correctly mounted on
a heatsink. Make sure the main power supply is fused and the work area is clear. First check all your
work and make sure the output devices are insulated from heatsink. The set up is done without an
input or a load connected to the power amplifier.
1. Check the power supply is operating correctly and verify the rail voltages. Switch the power
supply off and check with a multimeter that the rail capacitors have discharged.
2. Using a multimeter measure the resistance of VR2 and set it for maximum resistance.
3. Correctly connect the ground lead, the two positive leads plus the negative lead to the power
amp module.
4. Remove the PCB fuses and replace with 100 ohm 5 watt resistors. Connect a multimeter that
is set to the 20 volt scale across the positive rail 100 ohm resistor.
5. Check that the power supply connections are correct one last time and switch on. If the
multimeter reading goes off-scale, turn off immediately and find the problem. Check also the
100 ohm 5 watt resistors; they may have gone open cct.
6. If everything seems ok adjust VR2 to set the output stage bias current, by measuring the
voltage across the positive rail resistor. Adjust for a reading of 4 volts per output FET pair. I.e.
For a 6 FET board set for a voltage of 12 volts. This equates to a bias current of 40mA per FET
pair or 120 mA total. For the 12 FET board set for a voltage of 24 volts.
7. If everything seems ok, check the output offset voltage and adjust VR1 to achieve an offset of
less than 10 mV. You will need to wait briefly between adjustments for the offset to settle.
8. All being well switch off, back off the bias control trimmer (VR2) and replace the 100 ohm
resistors with 10 ohm 1 watt resistors. Switch on again and re-adjust VR2 to get 0.4 volts per
FET pair.
9. Switch off, remove the resistors and put the fuses back in. Switch on, re-check the offset
voltage and adjust with VR1 if necessary.
The amp module is ready, connect the input and output and enjoy.

Inverter 500-W 12volt to 220volt By 2N3055 +4047 Citcuit schematic with explanation

Using this circuit you can convert the 12V dc in to the 220V Ac. In this
circuit 4047 is use to generate the square wave of 50hz and amplify the
current and then amplify the voltage by using the step transformer.

How to calculate transformer rating

The basic formula is P=VI and between input output of the
transformer we have 
Power input = Power output

For example if we want a 220W output at 220V then we need 1A at the output.
Then at the input we must have at least 18.3V at 12V because: 12V*18.3 =
220v*1

So you have to wind the step up transformer 12v to 220v but input winding
must be capable to bear 20A.

author: Ashad Mustufa
Source: electronic-lab.com

STM32F429I-DISCO Circuit schematic ARM conrtex

Hello everyone,
I am very excited to play with STM32F429I nautical DISCO which is the presence of ARM Cortex M4 microcontroller with external RAM 64Mbit. The most exciting part of the Council is a 2.4 "QVGA TFT LCD screen and a gyroscope, and a microcontroller is a 256KB and 2 MB internal flash and RAM respectively.
I plan to do many things in this forum, and 3 GP / MP4 video player (if possible, but not certain), and an oscilloscope with an external high-speed ADC, games and interactive video, and identify simple speech, 3D rendering and a lot more. You can also expect an article on how to develop applications in this forum using free and open source tools (arm-nothing EABI-XXX) in the Linux environment.
element14 Council is waiting impatiently. Stay informed, and will be updated with exciting projects .

Ready to experience a new kind of phone brand? Meet Google ARA amazing project

Google is currently working on the phone to change all phones. A new concept of mobile units that allow you to design exactly your phone - both aesthetically and functionally.

You start with an internal structure, or "endo" as Google affectionately called, which is the basis of your phone and then add modules that modify or add to the phone functions. ARA thinking a bit like phone Lego, different pieces snap in and out to the phone what you want to do it.

Go on vacation? Get a great camera by simply adding a new module. In games? Add a faster processor while playing. Make music the center of your world with super speakers or use of remote sensing and medical devices to keep a check on your health.

And the best part is that you do not have to sacrifice one thing for another. Only a few clicks and you swops and super powerful phone player turns into a lightweight, fast phone perfect for the office. Or resize using different endos - you have a small phone Saturday night in your pocket or handbag and then the same phone in Phablet to work on Monday morning!


Can also be units be shared by anyone else with the phone ARA - no need to upgrade every few years, to constantly develop modules that provide what you need, when you need it.

This concept phones, because it starts (and let's face it, with Google behind it, it is likely to catch on!) You will be great news for companies electronic component. Instead of just necessary to make a few parts of the phone, and will make every unit of them. With the aim that people are more units can be used at one time, and there will be a need for more of the electronic components of the smart phone standard. More of the components is always a good thing for our industry!

(Google is still working on a prototype for the conference to be held on January 14, 2015, where we learn more about the phone units to find out.)