Category: Digital Electronics Projects

In the category “Digital Electronics Projects” various circuit is designed and verified using different gates and digital IC.

Fastest Finger First Circuit with 7-Segment Display and Alarm

Engineeering Projects
Fastest Finger First Circuit with 7-Segment Display and Alarm

Imagine you’re on stage, heart pounding, eyes locked on the big screen in front of you. The host asks the final question—this is it. Your reflexes are sharp, your hand hovers over the buzzer, and then BAM! You slam that button down faster than a cheetah chasing its dinner. But how does the system know you were the first? That’s where the Fastest Finger First Circuit steps in. This little piece of engineering magic can make or break a game show, quiz night, or classroom competition. Today, we’re diving into…

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Dual-Priority Encoder Circuit with 74148 and 74266 ICs

Engineeering Projects
Dual-Priority Encoder Circuit with 74148 and 74266 ICs

Imagine this: you’re a traffic cop in the middle of a very busy intersection. Cars from every direction are honking, each one demanding to go first. You’ve gotta make a decision, right? Now, picture that some of these cars have more “urgency” than others—maybe an ambulance is in the mix, but there’s also a VIP car behind it. Wouldn’t it be useful to know not only who needs to go first but also who should go second? Well, in the world of digital electronics, that’s what we’re doing with this…

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Programmable Attenuator Circuit Using OP07 and CD4052

Engineeering Projects
Programmable Attenuator Circuit Using OP07 and CD4052

Accuracy and control are especially in great demand in the domain of test and measurement systems in today’s digital world. For that reason, there is much room for improvement in the design of the digitally controlled programmable attenuator circuit in terms of accuracy and flexibility of signal processing. The following article guides on how to design a programmable attenuator circuit with the OP07 operational amplifier and CD4052 analog multiplexer. Combining them yields a high degree of signal attenuation in a digitally controlled manner, quite essential in instrumentation and test or…

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Digital DIY Reminder Project

Engineeering Projects
digital electronics projects

Ever want a no-frills reminder for weekly tasks without all the fuss or complication? Such may be your DIY Weekly Reminder Circuit! The LED Flash Alert, along with the LDR and a day counter, may all combine into a low-power reminder to take out the trash, water the plants, or return that overdue library book. Once programmed, it blinks an LED to remind you on the same day of every week and will continue to do so until the reset button is pressed. Well, here is how the Digital DIY…

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Temperature Alarm Circuit Tutorial: LM324 and 4093 IC-Based Design

Engineeering Projects
temperature alarm circuit

In this project, we are going to do a step-by-step guide to building a temperature alarm circuit whereby when it hits the specified temperature, it would start to trigger a buzzer. The entire circuit will be centered around an LM324 operational amplifier and 4093 NAND gate IC. This digital electronics project teaches you how to create a temperature-based alert system, useful in many applications, such as temperature-sensitive areas where an audible alert can help signal high temperatures. Components Required for Temperature Alarm Circuit To build this digital electronics project, you’ll…

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Multi-Switch Relay Control with EX-OR Gates

Engineeering Projects
relay control with ex or gate

Many electronics enthusiasts love to design their custom control circuits. Today, we’re exploring an interesting circuit that accomplishes single relay control through multiple switches. This circuit accomplishes this achievement and introduces the utilization of EX-OR gates within control systems. Check out the article on “How to make relay switch circuit” Before we delve into the circuit’s details, let’s first understand what an EX-OR gate is. Exclusive OR Gate An exclusive OR gate, often abbreviated as EX-OR performs the following logic “The output of a 2-input Exclusive OR gate assumes the…

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Simple Intruder Alarm Circuit

Engineeering Projects
receiver unit of intruder alarm circuit

In a world where safety and security are a major concern, imagine having a reliable intruder alarm system that can offer peace of mind. Here is a simple intruder alarm circuit that does not need a deeper understanding of electronics. These homemade security solutions are cost-effective also. So, if you are a DIY enthusiast or just curious about creating your own security setup. Here is a customized intruder alarm circuit that suits your needs perfectly. Let’s dive into its description and working methodology. Circuit Description of Intruder Alarm Circuit The…

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Making Your Own Dual-Tone Doorbell Circuit Diagram

Engineeering Projects
dual tone doorbell circuit diagram

Imagine opening the door to a gentle ding-dong sound that evokes the charm of classic electric bells. With our simple tutorial, you can create a simple yet attractive dual-tone doorbell circuit diagram that generates this lovely sound. Let’s plunge into the details of the circuit. Description of Dual-Tone Doorbell Circuit Diagram Our inventive dual-tone doorbell circuit diagram is assembled around the versatile IC CD40106, also known as a hex Schmitt-trigger inverter (referred to as U1). For precise triggering and to prevent any unintended activations, we’ve cleverly integrated an R-C filter…

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Digital Circuit Tester using 4049 IC

Engineeering Projects
digital circuit tester using 4049 IC

Digital circuits are an essential part of modern technology, and they power everything from smartphones to computers. However, detecting faults and troubleshooting digital circuits can be challenging, especially for those who are new to electronics. Here, we present a simple and versatile digital circuit tester that can help you identify problems in your circuits quickly and easily. Description of Digital Circuit Tester using 4049 IC The digital circuit tester described in this article is built around a CMOS hex inverter buffer CD4049 that contains six independent inverters labeled a-f. Inverter…

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Variable Duty Cycle Oscillator using 74123 IC

Engineeering Projects
variable duty cycle oscillator

IC 74123 is a digital IC called a dual re-triggerable monostable multivibrator or a one-shot. It has two identical circuits that can be used for things like generating pulses or delaying signals. You can use the IC 74123 by connecting it to other parts like resistors and capacitors and then using one of the trigger inputs. This will start a timing cycle that lasts for a certain amount of time, depending on the values of the other parts. One of the great things about the IC 74123 is that it…

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