Lamp Dimmer
12v LAMP Dimmer Parts IC 1 – NE555 Transistor – 2N2955 -1 Resistance – 1k(2 no.), 100 Ω Variable Resistance – 50k Capacitor – 0.1 µF Diode – 1N4001 – 3 12v 2 amp Bulb Input Voltage is 12v. To…
A home to software testing, electronics circuits & projects, tips and tricks and digital diary.
A home to software testing, electronics circuits & projects, tips and tricks and digital diary.
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LED Basics
Today LED has become an integral part of consumer electronics. LED TV, LED Display, LED Lights and so on. These are becoming very popular because of there low power consumption. What is LED? LED stands for Light emitting diode. A…
How to remove windows default share?
Windows default share C$, D$ etc are recreated on machine restart or restarting the server service. To remove these share we can add a batch file which will remove the share. This batch file can be executed every time the…
Saving perfmon data
If you are using perfmon tool in windows, you may sometime want to save the data for future analysis. To accomplish this you need to follow the following steps. Launch the perfmon tool. To open Performance Monitor, click Start,…
MAC Address Spoofing
To change MAC-Address for a Network card in Windows Registry: Click Start – Run, type “regedit” Navigate to [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002BE10318] HKEY_LOCAL_MACHINE \SYSTEM \CurrentControlSet \Control \Class \{4D36E972-E325-11CE-BFC1-08002BE10318} 3. Under this key, you shoud see numbers in sequence as “0000″, “0001″ and so…
Load Testing using The Grinder
Introduction The Grinder is an open source load testing tool. The Grinder uses Jython scripts and the scripts are executed using agents which can be distributed over the network. Property file is used to define tests and load. The Grinder…
Regulated DC Power Supply Circuit
Below is the regulated DC power supply( 12, 8, 5 v) circuit. This circuit can be customized by adding 9v and 6v voltage regulator. Also, the 4 diodes can be replaced by bridge rectifier. Parts list: T1 – Step down…
Basic Power Supply Circuits – Part 2
Simplest DC power supply circuit using 78XX is shown below. Parts D1, D2, D3, D4 – 1N4007 IC1 – 7812 IC2 – 7805 C1 – 1000 mf C2 – 330 mf C3 – 10 mf T1 – 12 v Step…
Basic Power supply circuits Part 1
To understand power supply circuits, we need to understand rectifiers. A rectifier converts AC or alternating current to DC direct current. Rectifiers are used in Power supply circuits which we will discuss in detail. The process of converting AC to…
Importance of Latency and Bandwidth in Web response time
The six parameters of Web response time are listed below: Page size: Page size is measured in Kbytes, and on the surface, the impact of this variable is pretty obvious: the larger the page, the longer it takes to download.…