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Henry Santana

Henry Santana is a senior engineer with Kavlico Corp., Moorpark, Calif., and a registered professional engineer in Colorado. He received a BSEE from Colorado State University, Fort Collins.


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  • Electronic Load Achieves 0 Ω

    Electronic Load Achieves 0 Ω

    By Henry Santana, May 04, 2012

    Electronic loads are electronically controllable resistances used to test power circuit behavior at load resistances close to zero. This short piece shows how to build one using two op amps, an FET, a pot, a fixed resistor and an auxiliary (battery) supply.

  • Wide-Range Pulse-Width Modulator Uses 555 Timer

    By Henry Santana, September 15, 2005

    Simply adding a diode and potentiometer to a 555 timer operating in the asynchronous mode yields a pulsewidth modulator (PWM) with a duty factor adjustable from 1% to 99% (Fig. 1). Applications would include speed control of electric motors where the swi

  • Op Amp And Two JFETs Form A Voltage-Controlled Amplifier

    By Henry Santana, April 28, 2005

    A simple linear voltage-controlled amplifier can be constructed with one op amp and two JFETs (see the figure). The amplifier can achieve an 80-dB dynamic control range with less than ±0.2% linearity error for 0 V ¾ VC ¾ 0.8

  • MOSFET Circuit Forms Reliable Switch Debouncer

    By Henry Santana, July 19, 2004

    Mechanical switches can be noisy, generating multiple transient pulses that may cause faulty operation of fast digital circuits. In this design, a pair of MOSFETs are used in a monostable mode to quench the switch-bounce pulses. The switch...