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Saturday, August 25, 2012

Magnetic levitation using Arduino!

At first i tried to implement this idea using opAmps to control the position of the object and i spent few hours trying to make it work to no success. Then I though of using Arduino and the idea is simple.. variating the strength of the magnetic field according to the Analoge input of the optical sensor (you can use a hall sensor too).

Monday, August 20, 2012

Step-Down switching voltage regulator - LM2576HV (5V, 3A)

The LM2576HV - 0.5 is a 5V switching regulator capable of delivering 3A. 
It requires a DC input voltage between 7 and 60V to deliver a fixed 5V on the output.
In my setup (12V input) i tested it with 1.5 Ohm load and found the input current to be 1.8A and the output current 2.6A. I found it interesting because it can be used as an Efficient pre-regulator for linear regulators!

I also tried to configure it as adjustable voltage regulator (5 to 11.44 V) using the same 12V on the input but im not sure if its safe to use it this way because there is a different dedicated version of the LM2576  for use as an adjustable switching regulator.

Monday, August 13, 2012

Laser Tripwire circuit !

A replication of Afrotechmods laser tripwire circuit. Using a simple laser pointer, IRF244 MOSFET ( most NPN transistors would do the job), a couple of resistors and one LDR
The Voltage divider of the resistor and the LDR should match the MOSFET gate voltage. 
Check the tutorial of Afrotechmods for more details! 
(Please note that the value of the LDR given in the schematic is not correct!)

Monday, August 6, 2012

LM324 Sine-Wave oscillator! (Quadrature oscillator)

This is an operational Amplifier based Sine/Cosine wave oscillator.
A replication of a circuit shown on Afrotechmods Oscillator video:

The design on which the circuit is based (Quadrature oscillator)
Source: the design of OpAmp sine wave oscillators