Tuesday, March 23, 2010

Assorted SMD Components

Here is a high resolution scanned image of assorted SMD components.
It took me one hour to place the components on the scanner glass and scan it at 1200dpi.
Why did I do it? I don't know, just like that.
Actually, this pic is quite useful to acquaint an engineering student with various SMD packages:
SOT23, TQFP, SOIC, TSSOP, Case B, 0805, MELF, QFN ... blah blah blah..

Here is the full A4 size image (low res.):



Here are the various sections of the above image in high resolution:

Jugaad: VCD skip prevention

A picture speaks better than a thousand words and "jugaad" is a word best defined thru pictures, so I will be putting up photos of jugaads whenever I come across them.

Jugaad inside an intercity Bus (Chandrapur <> Nagpur) to prevent VCD skipping due to jerks from potholes and bumps on the road:

Glut

Lots of "lots ofs"

0.1 microfard Mylar Capacitors (5 mm pitch) (scanned 'em ;) ):


0.1 microfarad box capacitors:


ATmega8535L:


ATtiny2313:


SPDT Slide Switches:


3.6864 MHz Crystals:



Lots of random SMD components:

Capacitors: so many shapes, so many sizes, so irritating

I made these two charts/pics as references for use while laying out PCBs:

Diameters of common thru hole cylindrical Electrolytic Capacitors





and Length and Breadths of SMD Tantalum Caps:



Notice that in thru hole electrolytic capacitors, the black band mark the negative terminals and in case of SMD tantalums, the black band marks the positive terminals. I learnt this the hard way - by soldering the tantalums the otherway round and watching them blow up. I wonder why some engineers make life so difficult for other engineers. How hard could it have been to follow the same standard on all kinds of polarized caps?