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ISSUE DATE: DECEMBER 15, 1997 OPTIONS
Microwave ICs, Power, EDA, SMDs, Optoelectronics, CD-ROM controller, Demultiplexing

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December 15, 1997 - In This Issue

[Ideas For Design]
Build your own optical heart-rate sensor
Plenty of noninvasive methods exist for electronically sensing the human heartbeat. The job can be done acoustically (stethoscope or Doppler), mechanically (sphygmomanometer), electrically (EKG), and optically. One handy optical technique presented...  — W. Stephen Woodward

[Ideas For Design]
Series LED driver operates on 3-V input
The circuit described here consists of a constant current source with a voltage compliance of 30 V (see the figure). It’s capable of driving a series string of LEDs at currents up to 100 mA. A switching...  — Contributing Author

[Ideas For Design]
Add remote/local control to distributed control system
The circuit described here implements remote/local transfer of control for distributed-control-system equipment. I have used this circuit as a part of the electronic circuitry for the remote/local control of a laser system. The laser can be controlled...  — Contributing Author

[Pease Porridge]
Bob's Mailbox
Dear Bob: Re: Paul Leonard and his comments on trekking in the Sept. 15 "Bob's Mailbox." INSPIRATION is something that's desperately needed in today's electronics industry. And...  — Bob Pease





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