Showing posts with label electronic. Show all posts
Showing posts with label electronic. Show all posts

Sunday, December 22, 2013

Simple Security Door Electronic Key

It is a relatively simple circuit of electronic lock of safety with code of 7 digits. It should is given attention in the time that will be stepped the keys, that shape code and it does not exist it delays. With the right step of keys and if code is right then is activated exit Q7 for roughly 4 seconds, driving the transistor Q2, which with the line can drive one relay, for the opening of door, or any other circuit.

Security Door Electronic Key Circuit diagram :

security-door-electronic-key Circuit diagram

With LED D we can have optical clue of activation. The code of circuit, as it has been given have been:1704570 but can change, if we change the connections between in the exits of IC1 and the switches.

Parts List :
  • R1-7=4.7Kohm
  • R8=15Kohm
  • R9=1Mohm
  • R10-13=10Kohm
  • R11=100ohm
  • R12=220Kohm
  • R14=1.2Kohm
  • C1-3=100nF 100V
  • C2=4.7uF 25V
  • D1-2=1N4148
  • D3=RED LED 3mm
  • IC1=4022
  • Q1=BS170
  • Q2=BD679
  • S1-10=Push button or keyboard
Source : http://www.ecircuitslab.com/2012/08/security-door-electronic-key.html
Read More..

Tuesday, December 17, 2013

Electronic 7 Digit Combination Lock

This 7-digit combination lock can be easily hard-wired for any combination that you choose. The circuit uses a 4-bit, divide-by-8 Johnson counter (IC1), ten push button switches and NPN transistor T1. At power-‘on,’ capacitor C2 connected to pin 15 of IC1 charges to high level through 820-kilo-ohm resistor, holding the counter in the reset state.

 In this condition, output O0 (pin 2) of counter IC1 is high, while all other outputs are low. When switch S2 is pressed, transistor T1 conducts and capacitor C2 discharges via diode D1 and resistor R2, releasing the counter’s reset input. When S2 is released, T1 cuts off and its collector is pulled high, generating a rising edge on the counter’s input clock pin 14.

 Electronic Combination Lock Circuit Diagram
 Electronic Combination Lock Circuit Diagram
Capacitor C1 and resistor R3 in the base circuit of transistor T1 form a simple filter to prevent switch contact bounce from generating multiple clock pulses on pin 14 of IC1. The clock pulse advances IC1’s count by one, so O0 goes low and O1 goes high. Therefore press switch S7 next, as it’s wired to output O1.

The time required for capacitor C1 to charge to logic high level is the maximum time that can lapse between switches pressed. Otherwise, the counter will reset. When all switches have been pressed in the correct sequence (S2-S7-S3-S4-S5-S2-S2 as shown), output O7 (pin 10) of the counter goes high for about ten seconds. This output is fed to driver transistor T2 to drive the solenoid valve and open the lock.

Assemble the circuit on a common PCB and enclose in a plastic cabinet. Connect the solenoid valve to the circuit using a flexible wire. While soldering, take care to avoid shortings. Use IC base for ease of troubleshooting. Connect the switches for opening the lock at the top of the plastic case.
Read More..

Saturday, August 10, 2013

How to Manufacture Automobile Electronic Parts and Earn a Handsome Income


To set up an auto electrical manufacturing unit, its important to have a thorough knowledge regarding the various technicalities associated with the field. The article makes a comprehensive approach and explains all the issues related to the subject. We begin with the basic raw materials and man power required for the intended installations and further proceed with the list of electronic parts that can be manufactured and sold in the relevant markets. The products that are included for the production are flasher buzzers, piezo buzzers, CDI units, musical horns, auto testing machine etc. How these can be made is also explained through discrete articles, linked in the sections.


Among most electronic products, the ones which are associated with automobiles are probably the largest selling types and are always in demand. Manufacturing these items and selling is surely a lucrative business. Here we discuss the procedures in details.

Today one thing that’s common with all of us is that we all want to earn money. However, with the population that’s ever growing, all sources of earning money have been captured, resulting in a cut-throat competition in every field. It’s feasible to make a way out from this intense competition only if you can manage an area where you are the master, and are able to create a monopoly.
The auto market today has become huge and with tremendous opportunities, but also it’s flooded with some tough competitors. Since vehicles cannot work without electricity and other associated electronic accessories, the products related to these have cropped up extensively and you can find a whole range of all sorts of electronic products, some of which are mandatorily used while some are just for decoration purposes. Whatever may be the seriousness of the application, electronic products have become today an integral part with all types of vehicles.
Thus, auto electronics is probably one such field where you can expect some good money, provided you are equipped with all the know-how required for the initial manufacturing set ups.
In this article we are going to discus the technical aspects required for setting up an auto electronic manufacturing plant for TWO-WHEELERS and THREE-WHEELERS, small though. However here we won’t discuss the legal procedures involved, like acquiring VAT number, CST number etc.
The following steps provide some crucial data regarding earning money by manufacturing auto electrical products:


What Electronic Products can be Manufactured for the Two-Wheeler Auto Market?

There are probably a host of them which you can choose from, or rather go for the entire range. Supplying or keeping the whole range will provide you with a better chance of fairing among the many vying vendors.
The items commonly associated with two/three wheelers are the side indicators, CDI units, rectifiers, buzzers, melody maker horn, etc.
To begin a manufacturing plant for producing the above auto electrical items, you would first want to acquire a space with a descent area; preferably a 20 by 40 sq ft will be ideal and sufficient to begin with.
You would also require fixing some furniture in the form of a long narrow table closely attached to the longer wall and a few number of chairs that can be accommodated. This set up is required for implementing the production process by lining up the workers so that the assemblies can be done in the most efficient manner.
The workers who would be responsible for assembling the electronic parts will need important and useful tools like the soldering iron, wire nipper, wire stripper, soldering paste, thinner etc. so all these must be procured in required numbers.
The engineers may require more sophisticated tools like multitester, desolder pump/wik, magnifying glass, power supply etc. along with the above mentioned tools. Procure all of these as per the requirements.
We are assuming that the workers required for carrying out the procedures would be appropriately employed, so we are not discussing how they can be contacted and interviewed etc.
After the initial set ups as discussed above are done, it’s time to select the items and chalk out the procedures plans. It would include the following points:
There should be at least one product that has the potentials to run through out the year, under all odds. Make it the base of your company’s production line.
  As an example you may select the buzzer unit, as it’s the easiest to assemble, finish, and sell, moreover the concerned raw materials are easily available. However this product may carry pretty low profit margins and you would need to sell tons of them to actually witness any significant income, but can be rest assured a steady flow of income through out the season.
The circuit of an electronic buzzer is discussed  HERE, it’s the simplest in design and widely used all across the world for automobile applications, especially in conjunction with side turn signal or flasher units.
The next type of selected product would be the one which sells like “hot cake” in the market, has reasonably less competition and has the potentials of providing fairly high profit margins.
You can assess the product and insist the engineers to do improvements in the form of cost cutting or adding new features into the product, so that it can stand out from the rest of the brands. This will give you an edge while introducing your product in the market.
A flasher with buzzer is one such item which satisfies the above conditions, I have already published an improved and low cost flasher buzzer circuit in Bright Hub – You can check it out  HERE.
  CDI units are another indispensable auto part which can be manufactured and sold with good profit margins. You can find it in Bright Hub, just type the relevant words in the given in-site Google search box.


You can refer this article to know how to make a two-three wheeler CDI circuit.
Having discussed the manufacturing process, testing these circuits for accuracy and reliability can become a crucial issue. A suitable auto part testing machine therefore becomes imperative, without which the whole set up may fail or jeopardize.
If you inquire about such a universal auto part testing machine, you would probably get it at very high costs. In Pune (India), Teckson Electronics has the monopoly of manufacturing these machines, and they charge an awful Rs.12000/- for each of them.
I investigated the mechanism and developed my own version at less than Rs. 600/- which is more efficient, and more reliable than the above unit. The complete design will be comprehensively discussed in one of my forthcoming articles.
That’s all what may be basically required and concludes the fundamental technical procedures involved with setting up an electronic auto part manufacturing unit.





Read More..