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8 results found, displaying items 1 - 8
Simple circuit shuts off system when supply voltage is low
Many low-cost and portable systems, including small consumer electronic products, operate from unregulated power supplies such as batteries or external, plug-in “power bricks.” These power sources sometimes produce lower-than-nominal output...
Read 16 digital inputs using a PC's serial port
Illustrated is an interface circuit that allows a PC to read 16 channels of digital inputs (see the figure). The circuit is connected to the PC’s COM1 serial port directly. The same serial port also powers...
Improved short-circuit detector
A previously submitted Idea For Design by Jim Wood (“ ‘Beeper’ Finds Short Circuits,” Oct. 24, 1996 “BEST OF ISSUE” SPECIAL SUPPLEMENT TO ELECTRONIC DESIGN, p. 18) impressed me because of the circuit’s simplicity to realize a useful...
Digital control selects analog cycles and burst frequency
Repetitive pulse bursts are required for impulse testing and for burst data-transmission schemes. Impulse testing subjects the device under test to a unit impulse or doublet, and the response waveform is analyzed to determine the circuit’s...
Waveform generator produces biological-stimuli signals
Electrical simulators are widely used in biological research for the study of evoked potentials in man and other applications. Indeed, versions are on sale in local health stores or via mail order for treatment of pain. However, for the stimulation to...
Special BIOS interrupt for real-time data acquisition and control
APC’s BIOS contains a special “dummy” interrupt (INT 1CH) that does nothing unless a routine is provided for it. At startup, the vector for the interrupt points to an IRET (interrupt return) instruction. When the interrupt is called, it simply returns...
Zero-voltage switching converter
The “TWitt” converter shown features a forward converter transfer function and can operate effectively at high switching frequencies because it achieves zero voltage switching (ZVS) of all of its switches for all transitions (...
Low-cost, isolated 5-V supply for 3.3-V logic
Occasionally, a 3.3-V logic system will need an isolated supply for a peripheral function. There are some dc-dc converters available. However, if spare inverters are present in the circuit, a low-cost solution can be produced using only four inverters...
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