Company YAGEO announced its intention to remove marking of RC/AC 0603,0805,1206 SMD chip resistors from July, 1-st, 2013.
Everything implies, that the situation with marking of chip resistors (0603/0805/1206) will soon be similar to chip capacitors – i.e. no marking on the top of the component. The reason for this step is to reduce unnecessary chemical usages for environmental protections.
Naturally, to identify the product resistance value, each single reel will be labeled with all relevant data as so far. Performance, features, specifications and manufacturing process of these resistors remain the same. So, the elimination of the marking on top of the product itself has no impact on the product functionality and reliability. There will be a short period of time that both types of the products, with marking and without marking, co exist while changing the production lines one by one.
Detailed information: Yageo – Remove marking of RC/AC 0603/0805/1206.
Will the SMD resistors marking become a history? – [Link]
With this tool you can test various electronic components like diodes, LEDs, all kinds of transistors (PNP, NPN, several types of MOSFETs), capacitors, resistors as well as triacs and thyristors. It will show you several physical characteristics after the test was completed, like forward voltages, (gate) capacity and amplification factor. More over, it will show the polarity of the component and identifies the several pins of a package. A very nice and sophisticated project I host for Markus Frejek. I’ve done an additional layout for the device you can see on the left side. This project has found a lot of fans, including myself. The device is powered by an AVR ATmega 8 MCU.
Component tester - [Link]
The TL431 is a three-terminal adjustable shunt regulators, with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between Vref (approximately 2.5 V) and 36 V, with two external resistors.
- Operation from -40°C to 125°C
- Reference voltage tolerance at 25°C
- 1%: A grade
- 2%: standard grade
- Low output noise
- 0.2-Ω typical output impedance
- Sink-current capability: 1 mA to 100 mA
- Adjustable output voltage: Vref to 36 V
TL431: Cost-effective shunt regulator solution - [Link]
This project over oomlout.co.uk shows how to build a robot able to cut resistors… If you are in need to cut a lot of resistors this will be handy. It uses an Arduino, a stepper motor, two RC servos, two exacto blades and a bundle of laser sliced 3mm MDF. It is able to produce resistors strips of any length. [via]
Resistor cutting robot – [Link]
The fixed resistors commonly used in DIY stompboxes look like small cylinders with leads (or wires) coming out of each end. Such components are called axial leaded. Resistors can be soldered onto a circuit board oriented either way; the leads are interchangeable. The leads are bent so that they can stick into holes on the circuit board. As a result, this type of resistor is also called through-hole. These resistors have a fixed value and the color bands on the cylindrical case of a resistor tell this value. The case itself identifies the type of resistor. Carbon film (labelled B and C) and metal film (labelled D) resistors are common types in stompbox builds. Older guitar effects were usually made with carbon composition resistors (labelled A).