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Circuits & Circuit Design

Latest News

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Neon Lamp Dice: An Elektor Classic!
Neon Lamp Dice: An Elektor Classic!

13-08-2025 | LED dice are everywhere, but their glow feels cold and clinical. This electronic die breaks the mold,...

Elektor Lab Talk #36: Circuit Special and More
Elektor Lab Talk #36: Circuit Special and More

13-08-2025 | Discover clever circuits in this new episode of Elektor Lab Talk, packed with real-world electronics...

Circuit: DIY Missed-Call Indicator
Circuit: DIY Missed-Call Indicator

11-08-2025 | But back in 1977, for most people, if you weren’t home to hear a ringing phone, the moment was gone...

Opinion
AI Won’t Replace Engineers, But It Will Forge a New Breed of Them
AI Won’t Replace Engineers, But It Will Forge a New Breed of Them

11-08-2025 | AI is transforming how we design electronics, but it’s not here to replace engineers. It’s here to create a new...

ESP32 Audio Transceiver Board (Part 1): SD Card WAV File Player Demo
ESP32 Audio Transceiver Board (Part 1): SD Card WAV File Player Demo

11-08-2025 | ESP32 microcontrollers, known for their versatility in IoT and smart home projects, also support digital...

Circuit: DIY PIC-Based Radiation Meter
Circuit: DIY PIC-Based Radiation Meter

8-08-2025 | Build a precision radiation meter with this PIC16F88-based design, featuring real-time pulse counting, audible feedback,...

Elektor Lab Notes 28: Soldering, ESP32 Audio Projects, Edge Impulse and More
Elektor Lab Notes 28: Soldering, ESP32 Audio Projects, Edge Impulse and More

7-08-2025 | Check out the latest installment of Elektor Lab Notes. We cover some of the newest projects on our workbenches,...

Elektor Circuit Special 2025
Elektor Circuit Special 2025

7-08-2025 | The Elektor Circuit Special 2025 is packed with innovative circuit designs, inspiring DIY...

The State of Marketing to Engineers (Webinar)
The State of Marketing to Engineers (Webinar)

6-08-2025 | Discover how engineers across Europe really research, choose, and trust technology! From datasheets...

Circuit: DIY Guitar Tuner
Circuit: DIY Guitar Tuner

3-08-2025 | Why buy a guitar tuner when you can build one yourself? Using an inexpensive board and a clever signal...

Researchers Develop Semiconductors for Experimental Physics
Researchers Develop Semiconductors for Experimental Physics

28-07-2025 | Standard chips can’t survive the extreme radiation inside CERN’s Large Hadron Collider, so researchers are developing...

Members Only​
Step-Down Converter from 48 V to 5 V: The Story of a Circuit Development
Step-Down Converter from 48 V to 5 V: The Story of a Circuit Development

28-07-2025 | Is it possible for a tiny microcontroller to run on a hefty 48-V battery? This project makes it happen...

Noteworthy Circuits & Designs

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Q-Watt Audio Power Amplifier: Lots of Power with Low Distortion

Hey, audio aficionados! This analog circuit was crafted entirely by the Elektor Lab team. The straightforward Q-Watt design features a single pair of transistors in the output stage. It boasts the capability to produce more than 200 high-quality watts into 4 ohms. The design's remarkable performance, characterized by exceptionally low distortion, is made possible through the integration of a specialized audio driver IC. The PCB holds the entire power amplifier, including buffer capacitors and protection circuitry. There’s just enough space on the circuit board for the heatsink that has to be mounted on IC1.

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Tiny On/Off Switch with Battery Level Check: Prevents Deep-Discharging the Battery

Use this compact Microchip Technology PIC MCU-based circuit to debounce a tactile On/Off switch for a battery-powered device. The circuit prevents power up if the battery voltage is too low, and it powers down the device when the voltage drops below 3.2 V. The idea is to use the PIC10F322 microcontroller to manage a push button and the battery voltage threshold to enable (or not) the power to the device.

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Sound Activated Switch for Amplifiers

Connecting a power amplifier directly after an audio source typically necessitates an extra power switch, adding inconvenience. A more seamless integration would involve the amplifier automatically powering on with the signal source. This can be achieved with the compact circuit outlined in this article. The design uses three transistors to sense the presence of an audio signal. The prototype circuit was built on a spare piece of perfboard, which works well but, as the designer explains, "won’t win any prizes for beauty."

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Simple 555 Tester

The 555 timer IC is renowned for its adaptability, frequently appearing in a variety of circuits due to its invaluable utility, which has garnered it significant popularity over the years. Despite the 555’s generally robust reliability, it is not immune to occasional malfunctions. The following circuit from 1980 offers a straightforward and efficient approach for testing devices that may be underperforming. While this circuit is not new, it represents the sort of circuit projects that Elektor was publishing four decades ago in its Summer Circuits edition.

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PCB Design

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Buried Pad PCB Fixing

Back in 2021, SparkFun's founder Nathan Seidle shared with us details about his company's “Wall of Unabashed Failure,” which is basically it is a wall full of bad PCBs. As he explains, each PCB failure tells a different story and serves as a reminder, so no one makes the same mistakes again. In this article, Seidle talks about PCB design, problem solving, and “a maneuver that I haven’t seen or tried before.” The best engineers know how to learn from their mistakes.

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Low-Volume Board Production: With and without Assembly

You've successfully designed and tested an electronic circuit board, and you're eager to produce it in small quantities. Yet, if you lack the financial capacity to order 10,000 pre-assembled boards and store them for future use, what alternatives are available to you? Saad Imtiaz (Senior Engineer, Elektor) offers some valuable suggestions. In addition to comparing a few notable PCB services, he covers component sourcing, touches on PCBA pooling, and offers tips for better PCB design

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PCB Tips and Tricks

PCB and PCB design technology is always improving. But it still helps to learn about tips, tricks, and solutions from the past. In this article, long-time Elektor Burkhad Kainka shares some insights about producing your own PCBs. He covers helpful topics such as building a proto-PCB, wiring diagrams, PCB layout, ground planes, connectors, checking board layout, and more. As you’ll see, many of his strategies are particularly useful when designing simple circuit boards for experimental projects.

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My First PCB: Going Headfirst Into KiCad

With open-source ECAD software, you can develop a workflow for creating printed circuit boards (PCB). George Lydecker became interested in KiCad because it is free and there are numerous online articles and videos about it. In this article, he touches on creating a schematic, creating a PCB layout, 3-D KiCad renderings, manufacturing a test run, testing a board, and more.

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Circuit Simulation

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Simulate Circuits Online: Circuit Simulation Made

You might lack all the necessary components to bring to life a circuit you envision. Alternatively, the circuit you aim to create might involve potentially hazardous voltage and current levels. In such scenarios, employing a simulator to experiment safely is a good idea. Simulators are readily accessible, with platforms like Tinkercad Circuits, discussed here, conveniently available via web browsers. Not only does it simulate circuits, but it also executes Arduino code, as demonstrated herein. Circuit simulation is a few clicks away.

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Audio Power Amplifier Simulation with TINA: The Try-Before-You-Build Approach

Sure, you can test many of your circuits by soldering or breadboarding parts. But you might also consider running a simulation. This article covers how to use TINA or TINACloud to comprehend, test, and analyze a simple audio power amplifier. You can use this approach without the risk of things like solder fumes or blown fuses.

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Circuit Simulation With Micro-Cap: First Steps in a Complicated World

Using a circuit simulator can save you time on testing ideas. It also is a handy learning and debugging tool because it can show you what goes on inside a circuit. This article introduces Micro-Cap, which lets you draw circuits and probe the signals in it while "turning knobs" by stepping parameters. It comes with a vast library of component models, including vacuum tubes. Design tools for active and passive filters are built in.

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Engineering Insights: Exploring QSPICE, a New Frontier in Circuit Simulation

In this episode of Elektor Engineering Insights, Elektor dives into the topic of circuit simulation and explores the capabilities of QSPICE, a Simulation Program with Integrated Circuit Emphasis (SPICE) tool developed by Qorvo. Experts Mike Engelhardt and Pete Losee talk about launching QSPICE, what they've learned about circuit simulation, and how QSPICE helps engineers developing SiC-based applications. They also cover some demo projects.

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Related Products

 

 
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Quick 861DW Hot Air Rework Station (1000 W)

The Quick 861DW is an advanced Hot Air Rework Station with a 1000 W heating power. It is designed for professional soldering electronic SMD components using lead-free solders.

 

 

 
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OWON SDS1102 2-ch Oscilloscope (100 MHz)

OWON SDS1102 is an affordable desktop digital oscilloscope with top features: 2-channel device with 100 MHz bandwidth, 1 GSa/s sample rate, 7" LCD display and 10 K pts wavelength.

 

 

 
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Elektor Circuit Special 2023

In the summer of 2022, Elektor brought back the Circuit Special edition. Read by engineers and makers throughout the English, Dutch, French, and German markets, the magazine was well-received by both long-time Elektor readers and new members! And now we are excited to announce the Elektor Circuit Special 2023.
 

 

 
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Circuit Simulation with TINA Design Suite & TINACloud

TINA Design Suite is a professional, powerful and affordable circuit simulator. It is a circuit designer and PCB design software package for analysing, designing, and real-time testing of analogue, digital, IBIS, VHDL, Verilog, Verilog AMS, SystemC, MCU, and mixed electronic circuits and their PCB layouts.