Sunday, March 31, 2013

Basic IC MonoStable Multivibrator


Basic LM555 Timer CIRCUIT

Part List
C2 = .01uf
IC1 = LM555 Timer
SWI = n.o. momentary switch
R1 and C1 determine lenght of
out put pulse where  t = R1 x C1
and R1 is in ohms and C1 is in farads .

by Tony van Roon
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Friday, March 29, 2013

Serial Connection Rj45

Rj45 Wiring Diagram on Rj45 Pinout Wiring  How To Make Up A 10baset 100baset Connection  Eia
Rj45 Pinout Wiring How To Make Up A 10baset 100baset Connection Eia.


Rj45 Wiring Diagram on Rj45 Wiring 568b
Rj45 Wiring 568b.


Rj45 Wiring Diagram on Rj45 Cat  5 Wiring Diagram For Straight Through Cable
Rj45 Cat 5 Wiring Diagram For Straight Through Cable.


Rj45 Wiring Diagram on Rj45 Socket Wiring   Reviews And Photos
Rj45 Socket Wiring Reviews And Photos.


Rj45 Wiring Diagram on Serial Connection Db9 To Rj45
Serial Connection Db9 To Rj45.


Rj45 Wiring Diagram on Wiring Tutorial For 10baset Rj45 Unshielded Twisted Pair  Utp
Wiring Tutorial For 10baset Rj45 Unshielded Twisted Pair Utp.


Rj45 Wiring Diagram on Above Diagram Of How Rj45 Socket Wiring Shouild Be Terminated
Above Diagram Of How Rj45 Socket Wiring Shouild Be Terminated.


Rj45 Wiring Diagram on Terminating Wall Plates   Structured Home Wiring
Terminating Wall Plates Structured Home Wiring.


Rj45 Wiring Diagram on Wiring Diagram For Rj 45 Cat5e Cable   I T  On The Go Inc  Computer
Wiring Diagram For Rj 45 Cat5e Cable I T On The Go Inc Computer.


Rj45 Wiring Diagram on Rj45 To Db9 Adapter
Rj45 To Db9 Adapter.


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Wednesday, March 27, 2013

A Car Battery Monitor

A close call on the road can really focus your mind on the importance of having a battery monitor in a car. I had been enjoying a pleasant week of travelling around the countryside at a leisurely pace and taking in the beautiful scenery each day. It wasnt until the final day, with the big rush to return home, that I had to drive at night.My home is deep in the country and on the road I was travelling the closest petrol station may be 80km away. I was travelling through an area that is full of open-cut coal mines and large heavily loaded semi-trailers constantly pound the roads, travelling at quite high speeds. It was around 8pm at night and everything was very dark no street lights or house lights anywhere.

Just as I was going up a hill, the lights began to dim and the engine coughed. A large semi-trailer loomed in the rear-vision mirror as I pushed the clutch in and tried to restart. My speed was falling rapidly and my lights were blacked out - I was like a sitting duck in the middle of the road, as the semi-trailer came rapidly bearing down on me. I just managed to pull the car off the road, as the semi-trailer came screaming past, missing me by inches! After calling for assistance from the NRMA, the problem was found to be a fault in the alternator, which was failing to charge the battery. The battery voltage had been falling under the heavy load of the lights and at the worst possible time, there was not sufficient power for the lights or the motor.

After the initial shock wore off, I put on my thinking cap to come up with a PIC-based solution to the problem. What was really needed was a display and a buzzer, to get my attention should the voltage fall outside a specified range. So my design criteria was set, a series of LEDs could indicate the voltage and a buzzer would also be used to warn of problems.
Main Features:
  • Visual indication of battery voltage
  • Audible warning when voltage becomes low
  • Screw terminals for easy connection
  • Simple and easy to build
Circuit details:

The circuit is based on PIC16F819 18-pin microcontroller which has an analog-to-digital (A/D) input to monitor the battery voltage and outputs capable of driving LEDs directly, to keep the component count down. There are seven LEDs in all, giving a good range of voltage indication. The topmost LED, LED1, comes on for voltages above 14V which will occur when the battery is fully charged. LED2 indicates for voltages between 13.5V and 14V while LED3 indicates between 13V and 13.5V. Normally, one of these LEDs will be on. LED4 covers 12.5V to 13V while LED5 covers 12V to 12.5V. LED6 covers from 11.5V to 12V while LED7 comes on for voltages below 11.5V. These two LEDs are backed up by the piezo chime which beeps for voltages between 11.5V and 12V and becomes more insistent for voltages below 11.5V.

That might seem fairly conservative. After all, most cars will start with no troubles, even though the battery voltage might be a touch below 12V, wont they? Well, no. Some modern cars will happily crank the motor at voltages below 11V but their engine management will not let the motor start unless the voltage is above 11V. So dont think that a modern car will always start reliably. This little battery monitor could easily prevent a very inconvenient failure to start! So lets describe the rest of the circuit. The incoming supply is connected via diode D1 which provides protection against reverse polarity while zener diode ZD1 provides protection from spike voltages.

A standard 7805 3-terminal regulator is then used to provide a stable 5V to the microcontroller. The battery voltage is sensed via a voltage divider using 33kΩ and 100kΩ resistors. This brings the voltage down to within the 0-5V range for the A/D input of the PIC16F819. Port B (RB0 to RB7) of the microcontroller is then used to drive the various LEDs, with current limiting provided via the 330Ω resistor network. RB7, pin 13, drives a switching transistor for the piezo buzzer.

Software:
For the software, the design follows the basic template for a PIC microcontroller. Port A and its ADC (analog-to-digital converter) function are set up while port B functions as the output for the LEDs and buzzer. Once the set-up is complete, a reading will be taken at port RA2, the input for the A/D convertor. This reading is then compared with a series of values to determine the range of the voltage. This is similar to a series of "if" statements in Basic language. If the voltage is found to be within a certain range, the relevant port B pin will be turned on. If the voltage is below 12V, the buzzer will be turned on for a brief period, to signal a low battery condition. As the voltage falls below 11.5V, the frequency of the beeps will increase, to signal increased urgency.
Building it:

All the parts are mounted on a small PC board measuring 46 x 46mm (available from Futurlec). The starting point should be the IC socket for the PIC16F819, as this is easiest to mount while the board is bare. The next item can be the PC terminal block. The resistors and capacitors can then follow. Make sure the electrolytics are inserted with correct polarity.

Make sure that you do not confuse the zener (ZD1) with the diode when you are installing them; the diode is the larger package of the two.
Even more important, dont get the 78L05 3-terminal regulator and the 2N3906 transistor mixed up; they come in identical packages. The 78L05 will be labelled as such while the 2N3906 will be labelled "3906". And make sure you insert them the correct way around. The buzzer must also be installed with the correct polarity. The 330Ω current limiting resistors are all in a 10-pin in-line package. There are four green LEDs, two yellow and one red. They need to be installed in line and with the correct orientation.
Testing:
Before you insert the PIC16F819 microcontroller, do a voltage check. Connect a 12V source and check for the presence of 5V between pins 14 & 5 OF IC1. If 5V is not present, check the polarity of regulator REG1 and the polarity of the diode D1. If these tests are OK, insert the IC and test the unit over a range of voltage between 9V and 15V. Make sure that all LEDs come on in sequence and the piezo buzzer beeps for voltages below 12V.
Now it is matter of installing the unit in your car. It is preferable to install the unit in a visible position for the driver. However, it should not obscure any other instruments. The unit should be connected to the cars 12V supply after the ignition switch. This will turn the unit off with the other instruments and prevent battery drain while the motor is not running.

Source: 
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Monday, March 25, 2013

SIGNAL INJECTOR

This circuit is wealthy in harmonics and is good for testing amplifier circuits. to seek out a fault in an amplifier,
connect the planet clip to the 0v rail and move through each stage, beginning at the speaker. a rise in volume ought to be heard at every preceding stage. This Injector will bear the IF stages of radios and FM sound sections in TVs. to Index

 
 
 
 
http://streampowers.blogspot.com/2012/07/signal-injector.html 
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Saturday, March 23, 2013

Nicad Battery Charger



This is so useful circuit for you .Because you can charge your Nicad Batteries by using this circuit.And the other advantage is this circuit is a low cost circuit.Try this.....





Note

#Use 2.4V,4.8V,9.6V Batteries to charge.
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Thursday, March 21, 2013

12v Automotive Electrical Voltage Indicator

12v Automotive Electrical Voltage Indicator

12v Automotive System Voltage Indicator
When troubleshooting the 12v electrical system of an automobile, its nice to possess an easy voltage indicator tool rather than a voltmeter. This electronic circuit, is powered by 2 AA or perhaps 2 N cells, which can offer enough energy for years of service. The circuit has solely two leads.

One lead connects to the chassis ground of the automotive. The second lead will be sharp tip probe. The circuit can indicate if an automotive electrical circuit has zero volts or 12 volts present. If the voltage is close to +12v, a inexperienced LED will activate. If the voltage is close to chassis ground a red LED will activate. If the circuit is open, neither light will light. The circuit attracts so few current in the open standby mode that no on/off switch is needed.
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Tuesday, March 19, 2013

Solar Panel System Diagram.

Wiring Diagram Software on Solar Panel System Diagram
Solar Panel System Diagram.
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Sunday, March 17, 2013

Cooper Wiring Deviceswire Nylon Industrial Electrical Plug Cooper

Cooper Wiring Devices on Cooper Wiring Devices 38b 30a Flush Mount Dryer Receptacle   Az
Cooper Wiring Devices 38b 30a Flush Mount Dryer Receptacle Az.


Cooper Wiring Devices on Cooper Wiring Devices Ivory Standard Single Receptacle Wall Plate In
Cooper Wiring Devices Ivory Standard Single Receptacle Wall Plate In.


Cooper Wiring Devices on Cooper Wiring Devices Introduces The Industry S First Line Of Switches
Cooper Wiring Devices Introduces The Industry S First Line Of Switches.


Cooper Wiring Devices on Cooper Wiring Devices 3 Wire Nylon Industrial Electrical Plug Cooper
Cooper Wiring Devices 3 Wire Nylon Industrial Electrical Plug Cooper.


Cooper Wiring Devices on Cooper Wiring Devices Wall   Corner Mount Passive Infrared Occupancy
Cooper Wiring Devices Wall Corner Mount Passive Infrared Occupancy.


Cooper Wiring Devices on Mini Cooper S Mark Iii Wiring Diagram And Electrical System   Circuit
Mini Cooper S Mark Iii Wiring Diagram And Electrical System Circuit.


Cooper Wiring Devices on Amazon Com  Cooper Wiring Devices 1107v Box 15 Amp 2 Pole 3 Wire 12
Amazon Com Cooper Wiring Devices 1107v Box 15 Amp 2 Pole 3 Wire 12.


Cooper Wiring Devices on Shop Cooper Wiring Devices 2836 Box  Cooper Wiring  3 Wire Vinyl At
Shop Cooper Wiring Devices 2836 Box Cooper Wiring 3 Wire Vinyl At.


Cooper Wiring Devices on Cooper Wiring Devices  Conduit Accessories  Cast Boxes  Ejb121204
Cooper Wiring Devices Conduit Accessories Cast Boxes Ejb121204.


Cooper Wiring Devices on Cooper Wiring Devices 271v Ivory 15a Commercial Combination Switch
Cooper Wiring Devices 271v Ivory 15a Commercial Combination Switch.


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Friday, March 15, 2013

Slim Films House Illustrations

House Wiring Diagram on Slim Films House Illustrations
Slim Films House Illustrations.


House Wiring Diagram on Home Wiring Diagrams Wiring Diagrams Typical Alarm System Wiring
Home Wiring Diagrams Wiring Diagrams Typical Alarm System Wiring.


House Wiring Diagram on Wiring Diagrams Top Of Page Home Wiring Diagrams And Blueprints
Wiring Diagrams Top Of Page Home Wiring Diagrams And Blueprints.


House Wiring Diagram on Speaker Cables And Cat5 Cables Heading Off To The Rest Of The House
Speaker Cables And Cat5 Cables Heading Off To The Rest Of The House.


House Wiring Diagram on House Of Pain House Of Pain The Rising Sun Lyrics Artist House Of Pain
House Of Pain House Of Pain The Rising Sun Lyrics Artist House Of Pain.


House Wiring Diagram on Electrical Wiring In The Home  Wiring A Double Wall Socket  Hot Wire
Electrical Wiring In The Home Wiring A Double Wall Socket Hot Wire.


House Wiring Diagram on To Help You Understand What Connections Need To Be Made After
To Help You Understand What Connections Need To Be Made After.


House Wiring Diagram on Need A Wiring Diagram   Electrical   Diy Chatroom   Diy Home
Need A Wiring Diagram Electrical Diy Chatroom Diy Home.


House Wiring Diagram on House Wiring
House Wiring.


House Wiring Diagram on House Wiring Dsl By Kissel
House Wiring Dsl By Kissel.


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Thursday, March 14, 2013

Make this LED Driver Circuit for Backlighting Small LCD Screens

Today LCD products have become very common and a part of our everyday life. Whether its your cell phone, DVD player, TV set, car, all incorporate LCD screens for indicating or displaying purposes.



 The big reason of LCDs getting so popular is probably the presence of the back lighting that illuminates the entire surface of the unit brightly, making the relevant readings distinct and full of life.

LEDs are the prime components which are used for the above illumination applications. Genarally a group of high efficient LEDs are placed behind a responsive surface for getting the desired LCD effect or the back light illuminations.

For smaller color LCD units, around 8 white LEDs are usually sufficient for the required intensities. When placed uniformly, they almost present a perfectly balanced illumination of the LCD.

An effective LED driver circuit for LCD back lighting application has been discussed here which utilizes the IC ZXLD1100/1101/1937 from ZETEX.

The proposed circuit is based on the principle of PFM inductive boost converter concept.
The circuit is able to handle six series connected LEDs, powered by a Li-Ion cell and up to eight LEDs from a supply of 5 volts.

The ZETEX ICs are able to provide a good 350 mAof current for driving the above LEDs through a boost of up to 28 volts from the above discussed supply sources.

The minimum current required for keeping the IC operational is around 0.5uA, below which the IC shuts down itself.

The converter output is variable and can be varied by applying definite PWM control pulses across the enable pin out of the IC.

Depending upon the frequency of the fed PWM, the generated output is either chopped or a true continuous analogue.


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How to Understand IC 4017 Pin Outs Explained in Simple Words


The IC 4017 can be considered as one of the most useful and versatile chip having numerous electronic circuit applications. Technically it is called the Johnsons 10 stage decade counter divider. 

The name suggest two things, it’s something to do with number 10 and counting/dividing.

The number 10 is connected with the number of outputs this IC has, and these outputs become high in sequence in response to every high clock pulse applied at its input clock pin out. It means, all its 10 outputs will go through one cycle of high output sequencing from start to finish in response to 10 clocks received at its input.


So in a way it is counting and also dividing the input clock by 10 and hence the name.



Let’s understand the pin outs of the IC 4017 in details and from a newcomer’s point of view:

Looking at the figure we see that the device is a 16 pin DIL IC, the pin out numbers are indicated in the diagram with their assignment names.

The pin out which are marked as output are the pins which become logic high one after the other in sequence, meaning the first in the order is 3, so this pin is the one which first becomes high, then it shuts off and simultaneously the next pin #2 becomes, then this pin goes low and simultaneously the preceding pin #4 becomes high and so on until the last pin #11 becomes high and reverts to pin #3 to repeat the cycle.

Please note that the word “high” means a positive voltage that may be equal to the supply voltage of the IC, so when I say the outputs become high in a sequential manner means the outputs produce a positive voltage which shifts in a sequential manner from one output pin to the next, in a “running” DOT manner.

Now the above sequencing or shifting of the output logic from zero to high and back to zero, happens only when a clock signal is applied to the clock input of the IC which is pin #14.

Mind you, if the no clock is applied to this input, it must be assigned either to a positive supply or a negative supply, but should never be kept hanging or unconnected, as per the standard rules for all CMOS inputs.

The clock input pin #14 only responds to positive clocks or a positive signal and with each consequent positive peak signal, the output of the IC shifts or becomes high in sequence, the sequencing of the outputs are in the order of pin outs #3, 2, 4, 7, 10, 1, 5, 6, 9, 11.

Pin #13 may be considered as the opposite of pin #14 and this pin out will respond to negative peak signals, if a clock is applied to this pin, producing the same results with the outputs as discussed above.

 However normally this pin out is never used for applying the clock signals, instead pin #14 is taken as the standard clock input.

However, pin #13 needs to be assigned a ground potential, that means, must be connected to the ground for enabling the IC to function. In case pin #13 is connected to positive, the whole IC will stall and the outputs will stop sequencing and stop responding to any clock signal applied at pin #14.

Pin #15 of the IC is the reset pin input. The function of this pin is to revert the sequence back to the initial state in response to a positive potential or supply voltage, meaning the sequencing comes back to pin #3 and begins the cycle afresh, if a momentary positive supply is applied to pin #15. 

If the positive supply is held connected to this pin #15, again stalls the output from sequencing and the output clamps to pin #3 making this pin-out high and fixed.

Therefore to make the IC function, pin #15 should always be connected to ground. If this pin out is intended to be used as a reset input, then it may be clamped to ground with a series resistor of 100K or any other high value, so that a positive supply now can be freely introduced to it, whenever the IC is required to be reset.

Pin #8 is the ground pin and must be connected to the negative of the supply, while pin #16 is the positive and should be terminated to the positive of the voltage supply.

Pin #12 is the carry out, and is irrelevant unless many ICs are connected in series, we will discuss it some other day. Pin #12 can be left open.

Any questions….:-)

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Wednesday, March 13, 2013

Article Complete Reference Home House Wiring Diagrams

Outlet Wiring Diagram on To Find With Outlets Are Shown In The Diagram Below  These Outlets
To Find With Outlets Are Shown In The Diagram Below These Outlets.


Outlet Wiring Diagram on Els 1 Electronic Light Sensor Typical Wiring Diagram 1 When
Els 1 Electronic Light Sensor Typical Wiring Diagram 1 When.


Outlet Wiring Diagram on Picking The Wire Gauge The Higher The Current Flowing Through
Picking The Wire Gauge The Higher The Current Flowing Through.


Outlet Wiring Diagram on Electrical Wiring In The Home  220v 4wire To 220v 3wire  Recepticle
Electrical Wiring In The Home 220v 4wire To 220v 3wire Recepticle.


Outlet Wiring Diagram on Photo Of Ceiling Fan Wiring And Connections
Photo Of Ceiling Fan Wiring And Connections.


Outlet Wiring Diagram on Article Is Complete Reference For Home House Wiring Diagrams
Article Is Complete Reference For Home House Wiring Diagrams.


Outlet Wiring Diagram on If Wiring A Newer Dryer Into An Older Home Containing A 3 Wire Outlet
If Wiring A Newer Dryer Into An Older Home Containing A 3 Wire Outlet.


Outlet Wiring Diagram on To Wire Electrical Switches And Outlets The Complete Guide To Wiring
To Wire Electrical Switches And Outlets The Complete Guide To Wiring.


Outlet Wiring Diagram on Infiniti G37 Coupe Electrical Wiring Diagram And Power Control System
Infiniti G37 Coupe Electrical Wiring Diagram And Power Control System.


Outlet Wiring Diagram on Wiring Diagrams   Nema L14 30p Wire Diagram L14 50 Plug Connector
Wiring Diagrams Nema L14 30p Wire Diagram L14 50 Plug Connector.


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