This article provides a detailed description of our methodology for testing power supplies in three major parts. The first one lists PSU parameters we check out and specifies the test conditions. In the second section you`ll find terms often voiced by PSU manufacturers for marketing purposes and their definitions. The third part will be most inter
Click here to download the full size of the above Circuit.
esting for people who`d like to know how our PSU testbed is designed and operates. In our PSU tests our main task is to check it out at different loads, up to the maximum one. Many reviewers used to employ an ordinary PC for that purpose, installing the tested PSU into it. This method had two drawbacks: you had no control over the amount of power consumed by the PC, and it was hard to load a really high-wattage PSU. The second problem is especially crucial today when the PSU manufacturers have started a race for reaching as high a wattage rating as possible, and the capabilities of their products have by far exceeded the demands of a typical PC. Of course, one may argue that there`s no point in testing PSUs at higher loads if no real PC needs more than 500W, but it would be odd not to check out a high-wattage PSU through its entire load range if we begin to test it at all. We use an adjustable load with programmable control to test PSUs in our labs. The testbed is based on the well-known feature of metal-oxide-semiconductor field-effect transistors (MOSFETs): a MOSFET limits the current flowing in the drain-source circuit depending on the voltage in the gate. Above you can see a simple schematic of a MOSFET-based current regulator: connecting the circuit to a PSU with an output voltage of +V and turning the lever of the variable resistor R1 we are changing the voltage on the gate of the transistor VT1 thus changing the...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
characters left: