A very simple electronic key code lock circuit that require few external components can be constructed using this schematic diagram . This low cost key code circuit use six switches that needs to be pressed to open the lock, but only two switches at a time.
An essential property of this electronic code lock is that it works in monostable mode, i.e. Three sets of switches SA-SC, S1- S8 and S3-S4 are pressed, in that order, to open the lock.
Depressing switches S1 and S8 in same time, within five seconds of releasing the switches SA and SC, pulls pin 2 to ground and IC 555 is triggered. Within these five seconds, switches SA and SC are to be pressed momentarily once again, followed by the depression of last code-switch pair S3-S4. The contacts of the relay close and the solenoid pulls in the latch (forming part of a lock) and the lock opens. The given circuit can be recoded easily by rearranging connections to the switches as desired by the user. CAPTCHAThis question is for testing whether you are a human visitor and to prevent automated spam submissions. Why VHS and Five Other Formats May Live Forever SmithsonianSmithsonian Twenty years later, however, when DVDs hit the scene in 1997, the new quickly gobbled up market share, reports Ananya Bhattacharya at Quartz. Intro: How to make an electronic piano with a 555 ICIn this instructable i hope to be able to show you how to make a simple toy piano using a 555 timer ic and a few basic components.
Step 5: Resistorsto make the piano work you need to add the 1k resistors between the points of the button. Step 9: Pins 2 and 6pins 2 and 6 need to be connected and then attachd to the negative end of the buttons.
Step 14: Adding a switchCut he red wire between the battery and the board, strip the ends and solder them to the prongs of a switch.


Intro: Simple Electronic Piano with 555 timer in CD CaseIn this instructable, I will show you how to make a simple electronic piano with common components. Step 2: Making the circuit on breadboardFirst, lets put the components on a breadboard so we could see how it worked and how to fit it onto the perfboard.
Step 4: Complete the circuit on perfboardStep 1 Pins 2 and 6 need to be connected together and then attach to the negative end of the buttons. Step 5: Adding the LED and Power Wire#FOR LED Step 1 Solder the resistor to the positive terminal and the other end to the positive lead of the led (the longer one). Step 6: Putting all togetherNow it's time to put it all together, attach the power wire, potensiometer, speaker, and check all your joints and work through the diagram circuit.
Step 7: The EnclosureStep 1 Drawing the pattern on CD Case with marker for placing the circuit, speaker and potensiometer. Step 8: Put the circuit into enclosureI attach the perfboard to the CD Case with 'Foam Double Sided Tape' instead of using hot glue, just in case I want to modify the circuit later. This electronic key code lock circuit is based on a common 555 timer circuit and some other common components . In many other , more expensive electronic circuits the key code is formed by pressing some switches one by one , not like in this case two switches . Capacitor C3 and resistor R4 are so selected that it takes about five seconds to fully discharge C3. The circuit is consist of two parts first 555 circuit of organ and second lm386 amplifier for driving 8 ohms speaker. If you don’t like to press two switches in the same time you can eliminate one switch , but in that case the code can be more easy to guess by someone ells .
By applying a low-going pulse to the reset pin 4, the output at pin 3 can be brought to the quiescent low level. If any one of these switches is pressed, the IC is reset and the output goes to its quiescent low state.


The circuit will generate slightly different tone by pressing each switch from S1 to S7 and work like a piano. And tell me which type of resistor the 10k resistor is it's variable or simple the circuit shows the resistor is variable but you have used a simple resistor ? When the project is finished you will have a working simple circuit that can produce a variety of tones. You can also change tone of all switch from S1 to S7 at once by adjusting the variable resistor R9. Of course, there are a couple of instructables that already feature such a circuit, but this is an Electronic Piano similiar to the one designed by sholtob.
For reference, the original sholtob article is here while a great tutorial on building it is here. For the enclosure I used an old CD case, so it will easy to hold, and to keep the circuit well.
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Very funny!Nice one took me a few try's to get it right but this was a nice project i had fun and my kids did after i was done. Good work thanks for the project if more buttons are inserted, do we need more voltage than 9V? And if it is one, how do you connect pin 1 to the gnd?yes it is, i didnt have one so left it out, the pins are conected line in the schematic and the arow represents the middle pinanyway to sustain the notes for a period of time?only by holding down the button, unless you used a microcontroller or much more complex circuithow much does this cost in the end?i allready had the speaker and buttons, 555s cost around 20p and the rest of the components are cheap so probably 2 or 3 pounds if you bought it all separatlythank you very much ..



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Comments to «Simple electronic piano with 555 timer in cd case»

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