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This intelligent electronic lock circuit is built using transistors only. To open this electronic lock, one has to press tactile switches S1 through S4 sequentially. For deception you may annotate these switches with different numbers on the control panel/keypad. For example, if you want to use ten switches on the keypad marked ‘0’ through ‘9’, use any four arbitrary numbers out of these for switches S1 through S4, and the remaining six numbers may be annotated on the leftover six switches, which may be wired in parallel to disable switch S6 (shown in the figure). When four password digits in ‘0’ through ‘9’ are mixed with the remaining six digits connected across disable switch terminals, energisation of relay RL1 by unauthorised person is prevented. For authorised persons, a 4-digit password number is easy to remember. To energise relay RL1, one has to press switches S1 through S4 sequentially within six seconds, making sure that each of the switch is kept depressed for a duration of...

One of the common  rounds in the  quizzes is the buzzer round. We are describing here a simple electronic circuit that can be used in any test or quiz competition. In this circuit, only four persons can participate,  and  every  participant is assigned a certain number. Whenever a switch is pressed, the circuit locks the remaining three entries. At the same time, an alarm sounds and the designated switch number is displayed on the seven segment LED display.When a player presses his switch, the corresponding output of IC1 goes high. Let us suppose, when switch S1 is pressed, D1 input of IC1 goes low and its corresponding output Q1 goes high. As a result, current passes through D5 to piezo buzzer PZ1, which creates a beep. At the same time, current also passes through diodes D6-D7 to show the number on the LED display. Simple Electronic Quiz Switch Circuit Diagram Simple Electronic Quiz Switch Circuit Diagram Similarly, when any other switch (S2-S4) is pressed, t...

One of the common  rounds in the  quizzes is the buzzer round. We are describing here a simple electronic circuit that can be used in any test or quiz competition. In this circuit, only four persons can participate,  and  every  participant is assigned a certain number. Whenever a switch is pressed, the circuit locks the remaining three entries. At the same time, an alarm sounds and the designated switch number is displayed on the seven segment LED display.When a player presses his switch, the corresponding output of IC1 goes high. Let us suppose, when switch S1 is pressed, D1 input of IC1 goes low and its corresponding output Q1 goes high. As a result, current passes through D5 to piezo buzzer PZ1, which creates a beep. At the same time, current also passes through diodes D6-D7 to show the number on the LED display. Simple Electronic Quiz Switch Circuit Diagram Simple Electronic Quiz Switch Circuit Diagram Similarly, when any other switch (S2-S4) is pressed, t...

This is the Simple Electronic Mosquito Repellent Circuit Diagram. This circuit is very much easy to understand and use. A circuit with minimum components repel mosquito Large number of things like coils, creams, oils is Simple Electronic Mosquito Repellent Circuit Diagram available in the market to repel mosquito. At the same time all these replant is also harmful for the humans too. Oils and creams can led to skin disease, while coils or mats produces toxic fumes which can lead to breathing problem. While in this circuit there is no harm for human being as it produces frequency which human being can not hear. Mosquito repellent generates a frequency ranges from 20-38 KHz. And mosquito runs away from your house as they irritates from these range of frequency. Human generations are able to hear frequency which has a range from 20Hz to 20 KHz. All the rest frequency above this is considered as a ultrasonic frequency. Many animals and insects are able to hear this range of frequency. Usua...

Electronic Pulse Generator And Signal Tracer Circuit Project. Dual-purpose test-instrument, Very simple circuitry, 1.5V Battery-operated. This simple circuit generates narrow pulses at about 700-800Hz frequency. The pulses, containing harmonics up to the MHz region, can be injected into audio or radio-frequency stages of amplifiers, receivers and the like for testing purposes. A high-pitched tone can be heard from the speaker of the device under test when all is working properly. The clip must be connected to the ground of the device under test, touching with the probe the different stages of the circuit, starting from the last stage and going up towards the first. When the tone is no longer heard, the defective stage has been found. Connecting an earclip or headphone to J1, the circuit will automatically change into a two-stage amplifier and any audio signal coming from the device under test and picked-up by the probe will be heard through the headphones. The testing of a circuit shou...

No one had a clue during the early days of television the incredible impact that this device would have over people and their daily lives nearly a century later. I can hardly believe the difference between the television offerings of my childhood and the vast number of quality shows, channels, and information that is available by simply turning on the television. In addition to that, the quality of sound that can be achieved through the simple act of adding a receiver and surround sound speakers to your television is day and night when comparing before and after. I do not think for one second anyone could have possibly anticipated the global impact that televisions have introduced. Add to that the entertainment value and the fact that we are now using our televisions for much more than simply watching and you have opened up a whole new world of entertainment. Surround sound not only works wonders with movies and (some) television shows but is also an excellent enhancement for video gam...

This is a very simple and low-cost Electronic Circuit Project of NiCd charger using with transistors. This NiCd charger allows simultaneous charging of up to seven NiCd batteries connected in series. This number can be increased if the supply voltage increases by about 1.65 V for each battery. NiCad Charger Using with Transistors Circuit Diagram: Given that T2 is mounted on appropriate heat radiator, the input voltage can be increased to a maximum of 25 V. Typically these loads to NiCd batteries a current equal to one tenth of the battery capacity. If current value is greater than indicated, the charging time must be reduced proportionally, to prevent damage to battery elements. The charging current is controlled by P1 between 0 mA to 1A current can be measured with a voltmeter connected parallel of R3 (which, to avoid additional calculations, has value, convenient to 1ohm). Lowering the value of R3, maximum output current can be increased to over 1 A. Circuit consume 15 mA current in ...