Cell Phone Jammer Using IC555

A Simple Cell phone jammer using IC555.

GSM Controlled Robot

In the project the robot is controlled by a mobile phone that makes a call to the mobile phone attached to the robot. In the course of a call, if any button is pressed a tone corresponding to the button pressed is heard at the other end called ‘Dual Tone Multiple frequency’ (DTMF) tone.

8x8 Dotmatrix Scrolling LED Display

Here 64 leds which are connected to an Matrix display. The Anodes are drived through an Driver IC UDN2981 and the cathodes are drived through ULN2803. The Atmega8515 is used in this project to control the display. The microcontroller is programmed with Bascom AVR.

Infrared Remote Switch

A Simple Infrared remote control circuit.

Showing posts with label Low Voltage Alarm. Show all posts
Showing posts with label Low Voltage Alarm. Show all posts

Low Voltage Alarm

 Abhishek Kamdi  1 comment


Parts List-
R1, R3 - 2 - 1K 1/4W Resistor
R2 - 1 - 5K Pot
U1 - 1 - LM339 Op Amp IC
D1 - 1 - 1N5233B Zener Diode
D2 - 1 - LED
BZ1 - 1 - Piezo Buzzer
MISC - 1 - Board, wire, socket for IC

Notes-
1. The circuit will operate from 9V to 12V.
2. Adjust R2 until the alarm goes off at the correct voltage.
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Courtsy-simple-electronics.com

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