I was pretty actively in making the Assembly computer festival event and the live TV broadcasts made them in the late 1990′s and early 2000′s (and still somewhat in some later years). Here are some tricks learned on that era: Triax cables are used in TV broadcast industry for TV camera interconnections (connecting camera to →
I saw this question posted to ELECTRONICS HOBBY CIRCUITS IN FACEBOOK group: “can you tell me what is the meaning of calibration date of a multimeter and does it effect the work of a multimeter if it expires the calibration date?” The answer to this is: As all circuits will drift with time, the DMM →
Here is a teardown of cheap mains powered LED night light from LIDL. After few years of use this light became very dim and so useless. I opened it to see what is in it and what was broken. Let’s open it. Circuit board details Here is the circuit diagram. This is quite typical transformerless →
I have wanted to have an easy to use meter for measuring small SMD component. I first tried to fill my need with CEM SMD-100 Smart Electronic Components Tester few months ago, but that CEM SMD-100 meter did not work for me because it was very unreliable. To fill the need, I decided to test →
A decade box is a type of test equipment that can be used to substitute the interchanging of different values of certain passive components when you need adjustable value in electronics laboratory. Decade boxes are made for resistance, capacitance, and inductance. Decade boxes are typically quite expensive devices (compared to other cheap electronics parts). I →
I wrote around two years ago a blog posting on RJ-45 Ethernet surge protection. Now it is time to check out what is inside one cheap Ethernet surge protector. The product here is very cheap (around $2) CY UT-013 Lightning Protection RJ45 UTP STP CAT6 CAT5e Female to Female Network Lan Adapter Extender. The specifications →
I wanted to add an AC voltage meter to my electronics lab variac transformer output (0-275V AC). I decided to get a cheap Machifit AD16-22V 22mm Digital AC Voltmeter AC 20-500V Voltage Meter Gauge Digital Display Indicator with the following Specification: Model AD16-22V Mounting hole 22mm Voltage AC 20-500V Class of safety protection IP65 Color →
LED Energie brand LED bulb with following data stopped to work properly: 230V 50Hz 7W E27 450lm 3000K 60mA 20D 3684 Mod.5161 So lets make a tear-down Inside There seems to be 20 small LEDs in series inside bulb and one of them burned black. As such this LED string is expected to need around →
Tesla coils and other high voltage equipment that make sparks are always entertaining and potentially dangerous. There are some portable tesla coils you can buy online that say, “safe, low current”, and yet they still produce lightning and have a high voltage output.700K Mini Coil Tube Neon Glow Coil With Transparent Plate Power Supply For →
I have testes several logic analyzers (both commercial and DIY) and software for them. I would like to see on this Open Source world is some kind of common format logic analyzer data presentation and maybe common API for accessing the information. In this way it would be easy to write all kinds of applications →