BC548

The BC548 is a general-purpose NPN bipolar junction transistor commonly used in European and American electronic equipment. It is notably often the first type of bipolar transistor hobbyists encounter and is often featured in designs in hobby electronics magazines where a general-purpose transistor is required.

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IR Based Wireless Audio Transmitter and Receiver

“Wireless Audio is already a technically advanced field where Bluetooth and RF Communications are the main technologies (although most commercial audio equipment works with Bluetooth). Designing a simple IR Audio Link Circuit would not be beneficial when compared to the …

Pocket Metal Locator

“Cool little Pocket Metal Locator sensitive enough to identify small nails and tacks in wood with four independent search coils and LEDs. This cool little Pocket Metal Locator is sensitive enough to identify small nails and tacks in wood and …

Simple FM Radio Bug

“In the mid 1970s large numbers of small FM transmitters, operating in the FM radio broadcast band (88-108 MHz) appeared on the market. It started with a self-build kit from the Danish manufacturer Jostykit that allowed everyone to build a …

Stable FM Transmitter

“FM transmitter circuit projects are indeed quite popular among electronics hobbyists / students. But the frustrating part is most transmitters refuses to work at all, and secondly the internet is full of crappy transmitter circuits. Designing a stable FM transmitter circuit …

48 X 8 Scrolling LED Matrix Using Arduino

“This is my first Instructable and this is all about making a 48x8 Programmable Scrolling LED Matrix using an Arduino UNO and 74HC595 shift registers. This was my first project with an Arduino development board. It was a challenge given …

How to Make a UART to Cassette Tape Interface

“Before hard disks and floppy drives were widely used by the public, cassette tapes played a vital role in the world of information storage. In this project, we will learn how to build a simple UART to tape interface so …

One Transistor FM Transmitter

“This circuit is basically an oscillator which runs at around 100 MHz. The most important parts of the oscillator are the transistor Q1 and the tuned circuit, which comprises the inductor Ll and the variable capacitor CV1. When the battery …

Automatic Dark Detector

“I made a project on this platform and It’s not that much effective. So this project is all about the some minor upgrade to increase the effectiveness. If you are following me then you know that what I am …

A Desk Drawer Protector Using ESP8266

“I am slightly (just a teeny bit, I assure you) obsessed with my desk drawer and the arrangement of the contents therein. When I am in dire need of my Kuru Toga pencil (sketch emergency) or my Alaskan knife (bear …

DIY Synth Series Part 1 — The Exponential VCO

“Today’s music is mostly made using computer software to master tracks, add instrumentals, mix songs, manipulate sounds and much more— but how do they use to make music? Music used to be done entirely with REAL instruments such as …