Calculator and numeric system supporting permanent installation of user defined functions and libraries.
http://members.aol.com/rf21exe/
this linear ramp generator uses a DAC, a transistor array, MOSFET switches, and current-steering techniques to achieve 14-bit linearity
http://www.edn.com/archives/1996/091296/19di5.htm
http://www.bobblick.com/techref/projects/projects.html
Seven LED spin, giving the illusion of numbers in the air
http://www.bobblick.com/techref/projects/propclock/propclock.html
Li-ion batteries pack the most power per unit volume, but excessive charging or discharging can damage or destroy the battery and its surroundings, carefully designed circuits help you avoid such dire outcomes.
http://www.edn.com/archives/1996/120596/25df_04.htm
you can double the speed of a standard pseudonoise (PN) generator by using additional exclusive-OR gates and a fast 2:1 multiplexer
http://www.edn.com/archives/1994/122294/26di1.htm
nickel-metal-hydride (NiMH) battery model accurately predicts the discharge characteristics of an NiMH cell (or groups of cells)
http://www.edn.com/archives/1995/020295/03di1.htm
design of simple linear (unregulated) mains power supplies
http://www.duncanamps.com/psud2/index.html
circuit deletes narrow pulses from fixed-frequency PWM waveforms
http://www.edn.com/archives/1997/112097/24di_03.htm
uses LEDs to display logic states for high, low, rising pulse, and falling pulse in TTL circuits
http://www.solorb.com/gfc/elect/logprobe/index.html