10 Stage LED Sequencer
10 Stage LED Sequencer Components IC1- CD4017 IC2- NE555 C1 – 1μ C2- 0.01 μ R1 – 470 Ω R2 – 100 KΩ R3- 100 Ω LED1-10 – RED LED 9volt DC power supply. …
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.
Variable DC Power Supply using LM317
Below is the circuit for variable dc power supply R1- 240 Ω R2- 5K VR R2 can be replaced by fixed value resistor for fixed power supply. Following formula can be used to calculate output voltage. Vo=1.25(1+R2/R1) Output voltage should be2…
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20 Watt Inverter
This circuit will drive a 40 watt fluorescent or two 20-watt tubes in series. The transformer is wound on a ferrite rod 10mm dia and 8cm long. The wire diameters is 0.61mm wire for the primary and 0.28mm wire for…
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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…
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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…
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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…
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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,…
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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…
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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…
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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…
