This is the circuit diagram of a simple electronic combination lock using IC LS 7220.This circuit uses a relay for controlling any type of device when the combinations of four digits are pressed.Keypads are used as input here to enter…
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We use lot of short duration timers to alert when a predefined time elapses.This can come in extremely handy for applications such as Cooking, exercise, sports and so on.We use stopwatches, alarms and all sorts of things to…
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Circuit shown above is static 0 to 9 display using a 7-segment capable of displaying number from 0 to 9.It has a lot of applications in day to day life and was implemented using two simple IC's 7490 and…
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Infra Red Jammer Circuit Remote jammer circuit can be used to play pranks with your friends and its basically a fun ciruit to try on.And this circuit is very very easy to build and it will take only ten…
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This electronic circuit is one of the simplest code lock circuit one can make easily in their home.This circuit uses one transistor a relay and a few passive components in it.The logic of this circuit is also very simple.Even this…
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This is a simple light sensor circuit diagram which activates a relay when Light incident on sensor is above threshold.This circuit cost less.It comprises of a transistor, potentiometer, LDR(Light Dependent Resistor) and a relay with a protection diode.WORKING…
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Police Siren circuit using 555 Timer is the one we are about to see here.This circuit uses two NE 555 ICs and each of them wired as astable multivibrators.And a speaker is used in order to produce the…
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