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.

40W Fluorescent Lamp Inverter



Parts-

R1- 180 Ohm 1W Resistor
R2- 47 Ohm 1/4W Resistor
R3- 2.2 Ohm 1W Resistor (only needed once)
C1, C2- 100uF 16V Electrolytic Capacitor
C3- 100nF Ceramic Disc Capacitor
Q1- TIP 3055 or 2N3055 or equivalent
L1- See "Notes"
T1- See "Notes"
MISC- Wire, Case, Board, Heatsink For Q1, heatshrink, AM antenna rod for coil

Notes-

1) Wind L1/T1. You will need an AM antenna rod that is about 60mm (2.5 inches) long to wind T1/L1 on. T1/L1 are wound on the same core. Shrink a layer of heatshrink over the core to insulate it. Leave 50mm of wire at each end of the coils.
Primary: Wind 60 turns of 1mm diameter enamelled copper wire on the first layer and put a layer of heatshrink over it.
Feedback: Wind 13 turns of 0.4mm enamelled copper wire on the core and then heatshrink over that.
Secondary: This coil has 450 turns of 0.4mm enamelled copper wire in three layers. Wind one layer and then heatshrink over it. Do the same for the next two.

2) Calibrate/test the circuit. To calibrate/set up the circuit connect the 2.2 Ohm 1W resistor (R3) in series with the positive supply. Connect a 40W fluorescent tube to the high voltage ends of the transformer. Momentarily connect power. If the tube doesn't light immediately reverse the connections of L1. If the tube still doesn't work, check all connections. When you get the tube to light remove the 2.2 ohm resistor and the circuit is ready for use. You will not need R3 again.

3) This circuit is designed for 220V lamps. It will work with 120V units just fine, but will shorten the life of the tube.

3 Channel Spectrum Analyzer


Parts-
R1 -100K 1/4W Resistor
R2- 820K 1/4W Resistor
R3, R14, R16, R18- 2.2 Meg 1/4W Resistor
R4, R5, R6- 22K Pot
R7, R8, R9, R25, R27, R29- 10K 1/4W Resistor
R10, R11, R12- 680 Ohm 1/4W Resistor
R13. R15, R17- 580K 1/4W Resistor
R19, R20, R21- 39K 1/4W Resistor
R22, R23, R24- 47K 1/4W Resistor
R26, R28, R30- 33 Ohm 1/4W Resistor
C1, C5, C6- 0.012uF Polystyrene Capacitor
C2, C9, C10, C11- 3.3uF Electrolytic Capacitor
C3, C4- 0.0022uF Polystyrene Capacitor
C7, C8- 47nF Polystyrene Capacitor
C12, C13, C14- 0.47uF Electrolytic Capacitor
C15, C16, C17- 22uF Electrolytic Capacitor
D1, D2, D3- 1N4002 Silicon Diode
D4, D5, D6, D8, D8- Green LED
D10, D11, D12, D13, D14- Amber LED
D16, D17, D18, D19, D20- Red LED
U1- LM3900 Quad Op Amp
U2, U3, U4- AN6884 Bar Graph IC
MISC- Board, Wires, Sockets For ICs

Notes-
1) The circuit expects line level inputs. If you connect it to speaker level, you will have to readjust the circuit every time you change the volume.

2) After the circuit is connected, apply power and signal. Now adjust the pots until the corresponding group of LEDs reacts.

Simple Parallel (Printer) Port Interface




Parts-

U1, U2, U3 - 74LS367 Buffer IC 74367, 74HC367
MISC - Case, Wire, Sockests, 18 Pin Socket (For Output), 25 Pin Connector (For Parallel Port), Ribben Cable

Wireless Auto Tachometer



PCB SCHEMATIC-

Parts-

C1 - 1 - 0.47uF Capacitor
C2 - 1 - 47uF Electrolytic Capacitor
D1 - 1 - 8V 1W Zener Diode
D2, D3, D4 - 3 - 1N914 Diode
M1 - 1 - 200uA Meter
Q1, Q2 - 2 - 2N3391A Transistor
R1, R2, R9 - 3 - 1K 1/2 W Resistor
R3 - 1 - 47K 1/2 W Resistor
R4 - 1 - 10K 1/2 W Resistor
R5, R6 - 2 - 25K Trim Pot
R7 - 1 - 10K Trim Pot
R8 - 1 - 200 Ohm 2 W Resistor
R10 - 1 - 15K 1/2 W Resistor
R11 - 1 - 2.2K 1/2 W Resistor
S1 - 1 - SPST Togglae Switch
S2 - 1 - Three Position Single Pole Rotary Switch
MISC - 1 - Telescoping Radio Antenna, Enclosure, Power Cable


1) Step this circuit as follows -

2. Turn on the Tach and allow a few minutes for temperature stabilization.
3. Set S2 to 4 cylinders and adjust R5 for a meter indication of 180 (1800 rpm).
4. Set S2 to 6 cylinders and adjust R6 for a meter indication of 120 (1200 rpm).
5. Set S2 to 8 cylinders and adjust R7 for a meter indication of 90 (900 rpm).

2) To use the Tach, turn it on and let it sit for one minute to allow for temperature stabilization. Extend the antenna, select the right number of cylinders and hold the unit over the engine. If the reading is erratic or the needle jumps around, move the antenna closer to the ignition coil or spark plug wires.

3) The unit draws power from the car battery. If it is connected backwards, it will not work, but it won't be damaged.

12V To 24V DC-DC Converter Circuit



Parts-
R1, R2, R3, R4,R8, R7 6 100K 1/4W Resistor
R5 1 470 Ohm 1/2W Resistor
R6 1 10K Linear Pot
C1 1 0.01uF Mylar Capacitor
C2 1 0.1uF Ceramic Disc Capacitor
C3 1 470uF 63V Electrolytic Capacitor
D1 1 1N4004 Rectifier Diode
D2 1 BY229-400 Fast Recovery Diode
Q1 1 BC337 NPN Power Transistor
U1 1 LM358 Dual Op Amp IC
L1 1 See Notes
MISC - Board, Wire, Socket For U1, Case, Knob For R6, Heatsink for Q1


Notes-

1) R6 sets the output voltage. This can be calculated by Vout = 12 x (R8/(R8+R7)) x (R6B/R6A).

2) L1 is made by winding 60 turns of 0.63MM magnet wire on a toroidial core measuring 15MM (OD) by 8MM (ID) by 6MM (H).

3) D2 can be any fast recovery diode rated at greater then 100V at 5A. It is very important that the diode be fast recovery and not a standard rectifier.

4) Q1 will need a heatsink.

Water Detector With Pump Controller



Parts-
R1 1 470 Ohm 1/4 W Resistor
R2, R4 1 10K 1/4 W Resistor
R3 1 6.8K 1/4 W Resistor
R5 1 1 Meg Linear Taper Pot
R6 1 51K 1/4 W Resistor
C1 1 470uF 35V Electrolytic Capacitor
C2 1 0.001uF Ceramic Disc Capacitor
C3 1 0.05 uF Ceramic Disc Capacitor
C4 1 20uF 35V Electrolytic Capacitor
C5 1 6.8uF 35V Electrolytic Capacitor
C6, C8 2 0.01uF Ceramic Disc Capacitor
C7 1 100uF 35V Electrolytic Capacitor
U1 1 LM1830 Fluid Detection IC
U2 1 555 Timer
Q1 1 2N5305 NPN Power Transistor
D1, D2 2 1N4148 Signal Diode
D3 1 1N4002 Rectifier Diode
K1 1 Relay With 12V Coil (See Notes)
S1 1 SPST Switch
PROBES 1 Stainless Steel Probes (See Notes)
MISC 1 Case, Knob, Board, Wire, Sockets For U1 and U2

Notes-
# The probes should be made of stainless steel and mounted in a non-conductive fixture. Stainless steel nails, bolts or welding rod will make ideal probes. Good non-conductive materials are Lexan, plexiglass or plastic. The probes are to be placed at the liquid level at which you wish the pump to turn on.

1) K1 should be chosen according to the requirements of the pump. If you are running a 12V pump then common automotive relays will work fine. If you are running a mains powered pump then you will need to make sure the contacts are rated accordingly.

2) S1 provides a manual pump switch.

3) R5 adjusts the on-time of the pump once moisture has been detected. It is adjustable from approximately 5 seconds to approximately 2 minutes.

4) The probes should be cleaned periodically to assure reliable operation.

Wire Loop Alarm





R1 1 100K 1/2W 1% Resistor
R2, R4 2 10K 1/2W 1% Resistor
R3 1 1 Meg 1/2W 1% Resistor
C1, C3 2 0.1uF Ceramic Disc Capacitor
C2 1 0.01uF Ceramic Disc Capacitor
IC1 1 4001UBE Quad 2-i/p NOR Gate
Q1 1 MPSA14 Low Power NPN Transistor
SIREN 1 Micro piezo siren 12V DC 150mA, 110dB @ 1M
LOOP 1 See "Notes"
MISC 1 Board, Wire, Socket For IC1

Notes-

1) The loop can be any type of hookup wire, with a maximum resistance of about 90K. Using very thin wire (40AWG, for example) will make a very sensitive trip wire, but will shorten the distance it can be strung due to the high resistance.

2) The siren can be replaced with a relay to drive external loads.


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Courtsy-simple-electronics.com

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