Jim Walker, senior design engineer, received a BSEE from Drexel University, Philadelphia, Pa., and an MSSM from USC, Los Angeles, Calif. Email address: jim@walker-labs.com Web site: http://www.walker-labs.com/
3 results found for Jim Walker, displaying items 1 - 3
March 31, 2005[Ideas For Design] FET Supplies Low-Voltage Reverse-Polarity Protection
When a circuit requires reverse-voltage protection on the power input, the usual approach is a series diode (see the figure, a). But if the input voltage input is low—say, two or three AA batteries—the 0.5-V loss of a Schottky diode may represent a significant loss in useful battery life. An FET can serve as a series diode with significantly less voltage drop (see the figure, b). A dual IRF7342 FET was used (p-channel,...
June 7, 2004[Ideas For Design] Low-Cost Audio Delay Line Uses 1-Bit ADC
The concept of an audio delay line is simple. The voice or music to be delayed is analog-to-digital converted and fed into a shift register or any digital delay or storage medium. The delayed (or playback) digital signal is fed into a...
