diy

Build video isolator

Video isolation transformers are primarily used in CCTV application in fields of security, manufacturing, avionics and display. The video isolation transformer is an extremely broad bandpass 1:1 isolation transformer. Its hum isolation is very good and it can sustain very high noise voltages without degradation. Isolation decreases with increasing noise frequency. Video signals can transformer

Resistance soldering

Resistance soldering is a soldering method that sometimes useful for hobby work. In this soldering methid an electrical current is flowed through one work piece, the joint and then the other work piece. Current through a resistances on the way generates heat. Most heat is normally generated on the joint because the resistance there is

ColdHeat soldering iron

Coldheat is an American company that develops and markets special soldering iron called ColdHeat. ColdHeat iron product was review at ePanorama.net eariler. The secret of that product is a proprietary graphite-like compound called Athalite. The tip of this apparatus is split into two sections that completes an electrical circuit when something of low resistance is

Scene Quiz Show lights

Assembly TV broadcasts TV program from Assembly computer festival starting Thursday 6. August 2009 in many channels (Internet, cable TV, DVB-H mobile television, 3G mobile video etc.). The broadcast has for many years contained Scene Quiz Show (the name has varied somewhat over years). It involves three contestants answering questions related to the event, demoscene

Syncing Music and Fireworks

Design News has published an interesitng on-line article Gadget Freak Case #128: Syncing Music and Fireworks on how Deane Williams fixed up his PC to synchronize fireworks with music. He used his PC’s parallel printer port to connect the circuit controlling the fireworks. The software was written in Agilent VEE 8.0 but Williams says it

MOSFET testing

Multimeters are very good tools to find out problems in electronics circuits and testing electronics components. Resistor measurement is found in practically all multimeters, capacitance measurement range is becoming more and more common and some high-end models can also measure inductance. Many multimeters have also possiblity to test bipolar transistors (Hfe measurement range), but I