small sizes and pad areas of surface-mount components make them difficult to probe but this simple tip helps it.
http://www.edn.com/archives/1997/092597/20di_02.htm
simple transistorised relay into which can be plugged personality modules to turn the base unit into a timer (pulse, delay on energise or delay on de-energise) or a latching relay or whatever is required
http://www.4qdtec.com/trd.html
with a 1 GHz Transmission Line Probe
http://www.forestprod.org/drying02_ahmet.pdf
Online calculators with variety of engineering functions, including unit conversion, periodic table, piping applications, and electrical applications.
http://www.monachos.gr/eng/calculators/calculators.htm
[Windows] A desktop application that displays the times of the various phases of the moon and a picture of the current phase of the moon.
http://www.fourmilab.ch/moontoolw/
[shareware - MacOS] Real-time graphical representation of the lunar visual aspect for any time/date/location. Elongation, PA bright limb, RA, DEC, percent illuminated, alt/az, heliocentric lat/long, distance, and radius.
http://balder.prohosting.com/stouch/MOONCLOCK.html
Deep sky, solar and planetary images.
http://www.acatterall.com/
A very handy, concise summary of several active filter designs and types, including low-pass, band-pass, high-pass, band-reject, and notch. Focuses primarily on the Sallen-Key and multiple feedback (MFB) implementations, but also covers the Deliyannis and
http://www-s.ti.com/sc/psheets/sloa096/sloa096.pdf
Online data for many tubes.
http://www.nd2x.net/tube-1.html
Motion Computing tablet PC product features, specifications and picture gallery.
http://www.motioncomputing.com/products/tablet_pc.asp