Ronelex Electronics/Switch Mode Power Supply
Some of us like technician want to learn more about the Switch Mode Power Supply commonly called SMPS. This is a special type of power that uses a chopper transformer instead of an ordinary metal core transformer. We have to learn how this type of power supply works for us to have knowledge on how to repair this switch mode power supply if we will encounters problem related to power... [ Continue reading... ]
Ronelex Electronics/Making Isolation Transformer
According to Wikipedia, "An isolation transformer is a transformer used to transfer electrical power from a source of alternating current (AC) power to some equipment or device while isolating the powered device from the power source, usually for safety."
[caption id="attachment_145" align="aligncenter" width="498"] Photo Credits to:... [ Continue reading... ]
For those who are looking for a copy of the schematic diagram on this type of Analog Multitester and other brand using the same circuit diagram, you can download the schematic diagram in here. credits to Deantyne
[caption id="attachment_135" align="aligncenter" width="500"] credits also to: Deantyne[/caption]
For more information about this topic, you can visit Elab Forum for the discussion about this kind of Analog Multitester and... [ Continue reading... ]
We will be concentrating on LCD Inverter and CCFL bulb.
Laptop with black screen problem is commonly caused by:
1. a defective backlight, which is the cold cathode fluorescent lamp(CCFL) bulb
2. defective laptop's inverter board
3. no video output going to the LCD Screen
It is not an easy job repairing laptops specially if we don't have parts that we can use to replace to the parts we are suspecting to be the culprit. So now, we... [ Continue reading... ]
Building own Pisonet with pictures to be used as guide and inspiration in building your very own Pisonet Unit.
Bill Of Materials Used in the Assembly :
1 set pc - 12000
1 pc flywood - 870
timer - 250
coinslot - 180
paint and wirings - 500
speakers - 450
locks (mga kandado)- 300
glass - 120
And for the Prices and Specs for the Computer :
Hdd Internal: wd 500GB (SATA 6Gb/s) PHP 2750.00
Memory: corsair vengeance... [ Continue reading... ]
Here is diagram of the wiring of a Piso Net, which is popular here in the Philippines by using a PC with a Timer and Coin Slot to operate an Internet Cafe even without supervision because it is made to operate automatically. The main issue here is what signal or power source that you will cut to switch it using a relay. Some users are freezing the keyboard and mouse while other cut the signal or power line of the... [ Continue reading... ]
This is a project for those who want to build their very own Automatic Battery Charger. This is a project made by one of the member of Elab Forum, duc_tech. But as a reminder, this circuit don't have a current limiter which means this charger is good to use only on a known good battery but not on a battery that have defects like having a short or open plates which will cause the diodes, switching Thyristor and transformer to heat easily.... [ Continue reading... ]
This is an example how an LCD Start Up Circuit looks like. It shows the flow of the supply which switched on the circuit. This is only a very simple example and other start up circuit may looks more complicated than this one. We can make this image as a guide to give us an idea on how do a start up circuit of an LCD may looks like and how does it function. In this way, we now have the idea of the switching circuit of most LCD Monitor and all we... [ Continue reading... ]
Upon surfing the net, I have found this site: http://electroschematics.com displaying their projects on making a Transformerless Power Supply with a 12 volts output voltage and a current of 100mA. We usually see this kind of power supply on a China made model of rechargeable products like flashlights and mosquito killer. This circuit catches my attention because of its application in our work which needs a power supply and we can also use... [ Continue reading... ]
