They are Bipolar Junction Transistor. Both are NPN Transistors. Their difference is manufacturer and hFE and datasheet parameters, seriously. BC547 is European transistor while 2N3904 is American transistor. Both are common NPN bipolar junction transistors used for general-purpose low-power amplifying or switching applications. https://en.wikipedia.org/wiki/2N3904 The BC548 was released with, and often is found together in →
Building a sound system is often a highly personal process, from deciding what to get, to assembling and using it. Here is my PA system I built in 1990′s and used for some mobile DJing. The need for measurements were that it should fit easily to a normal size car with everything else that is →
Is there something about a stray cable that makes your eyebrow twitch? Driven mad by your colleagues making a mess with fiber optic lengths, each one a greater trip-hazard than the last? Well, we’ve got the solution for you. Don’t view it as a chaotic mess. Look at it, and imagine it’s art Server Cable →
In the hardware world, we’ve gone through generations of GPUs and processors, but we’re still rocking the same DDR4 RAM that’s been mainstream in PCs for almost seven years. But now it seems that DDR5 is finally coming: DDR5 modules are just around the corner, as production is in full swing and manufacturers are teasing →
A ground loop in your AV system caused by antenna connection or TV cable is very common if you have your computer connected to the same system. This type of ground loop problem can be solved by using suitable isolator between your AV system and the antenna cable. Antenna isolator is very convient way to →
I have designed many years a VGA cable based video camera cable which could hande video in two directions (from camera to mixer and return video to cameraman), a two-way voice connection (ClearCom type) and 12V power to the camera. All the signals run along an equally long (tens of meters) VGA cable. These were →
Microsoft has been calling Windows 10 ‘the last version of Windows’ for many years. But now based on current published information on-line that there will be a new Windows version coming, maybe with name Windows 11 or similar. One fact is that Microsoft is having a Windows release event soon that starts at 11AM ET →
I saw thus funny audio system noise troubleshooting video at Facebook. It was originally posted to YouTube under name Where does that noise come from? →
Here is a simple method to convert ePanorama.net electronics component data search tool to “mobile app” for Android phone: 1. Go to https://www.epanorama.net/cgi-bin/semi.cgi?keyword= on your mobile browser. 2. Select from your broser menu to create an icon to your smart phone start screen. 3. Now you have an icon that starts this web app as →
After the mid 90s boom in popularity glitch has become a critical part of contemporary popular esthetics. How to make Analog Video Glitches | Circuit Bending video discusses how to make unique analog “glitch” textures for your next video: Karl Klomp‘s Dirty Video Mixer is one of the best known and wide used simple circuits →