Donald Schelle is a staff field applications engineer for National Semiconductor Corp., Ontario, Canada. He received a bachelor's of engineering and a diploma in electrical engineering from Lakehead University, Thunder Bay, Ontario, Canada, and a diploma in electrical engineering-computer control from Confederation College, Thunder Bay. Email address: Donald.Schelle@nsc.com
2 results found for Donald Schelle , displaying items 1 - 2
January 29, 2009[Ideas For Design] An Easy Way To Roll Your Own Programmable Power Supply
Adjusting the output voltage of a power supply is a feature typically reserved for highly integrated handheld power-management units (PMUs) with multiple integrated power supplies. You can implement this feature, however, with any power supply by adding a single resistor and an inexpensive digital-to-analog converter (DAC) (Fig. 1). While this technique isn’t new, the equations to select...
June 9, 2005[Ideas For Design] Serialize Your HD44780 Liquid Crystal Display
Most LCD character displays connect to the outside world via a controller IC, such as the HD44780 (Hitachi) or equivalent. However, that interface has serious drawbacks. It uses a large number of the microcontroller's general-purpose I/O (GPIO) pins, and it can't provide digital contrast or backlight intensity control. The circuit in the figure reduces the required number of GPIOs from 11 to two while also supplying digital control of the LCD's contrast and backlight...
