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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