Electronics Design

Low resistance measurement

There are applications where measurement of low resistances are needed. Measuring low resistance helps identify resistance elements that have increased above acceptable values. How you measure low resistances below one ohms? Most multimeters aren’t accurate below 1 ohm. Occasionally, you’ll need to measure electronic parts with very low resistances, such as wires, switches, current-sense resistors,

HDMI conversions

The consumer market has adopted High-Definition Multimedia Interface (HDMI®) technology in TVs, projectors, and other multimedia devices, making HDMI a globally recognized interface. HDMI is a very popular video interface, but not everything have HDMI inputs or outputs. An HDMI converter is a device that converts an HDMI signal to another format — and vice

Iwatsu SS-5050 Oscilloscope

My first 20 MHz oscilloscope still works but age shows. Bought this sometimes in 1990′s used, made maybe sometimes early 1980′s. I don’t have original manuals and I have not found much info on this on Internet. My first real oscilloscope: Iwatsu SS-5050. Served well for many years until a digital oscilloscope took it’s place

Capacitor distortion

A resistor is a resistor, a coil is a plain ol’ inductance, and a capacitor is a capacitor – or so you thought. Alas, life isn’t quite so trivial… There are non-ideal properties of real components. Capacitors have non-idealities that you should know about when designing electronics circuits. If you are building high frequency circuits

Soldering gun tech and hacks

A soldering gun is an approximately pistol-shaped, electrically powered tool for soldering metals using tin-based solder to achieve a strong mechanical bond with good electrical contact. The tool has a trigger-style switch so it can be easily operated with one hand. Soldering guns are often used where more heat is needed than from the lower-power

Induction heater wireless LED

Inductive cooker powers a LED wirelessly. The kettle needs to be here to keep the inductive stove to be turned on (it will turn off when no big metal object is detected on heating area). This LED circuit worked for me for a short test, but there is no guarantee that it will work for

Qi Charger LED Flasher

Here is one experiment to power two LEDs using Qi standard smart phone charger. The two LEDs are wired to opposite directions in parallel to the output wires of 0.17 mH coil. The coil has around 80 turns (5 layers and about 16 turns each) Here is LED active I actually built two circuits with