Tripler converts 5
to 15V - 08/17/00 EDN Design Idea By configuring a
charge-pump voltage doubler as a tripler, you can readily derive 15V from 5V (Figure 1). A 15V rail is useful for
powering op amps, LCD-bias circuits and other low-current applications. The connections shown conf. . . [by Ken
Yang, Maxim Integrated Products, Sunnyvale, CA]
Ultra Pure 125kHz Sine Wave
Signal Source - For some RFID systems operating at
125KHz, a very low distortion signal source reference is needed. The circuit shown on this page produces a
10-volt peak-to-peak signal into a 50-ohm load, with a distortion of only 0. 01% . . . [Circuit by David A.
Johnson P.E., 02/11/02]
Very Low Power Astable
Multivibrator - This classic circuit draws only 200
nanoamps from a 1. 5v supply . . . [Circuit by Dave Johnson P.E., 06/10/00]
Very Low Power Gated Crystal
Oscillator - The circuit gates the output of a
continuously operating 32KHz crystal oscillator to the input of a C-MOS buffer when clock pulses are needed. The
technique gets around the problem of a slow starting crystal oscillator by keeping the oscillator going and
switching on a transistor power stage only as needed . . . [Circuit by David Johnson P.E., 06/03/00]
Voltage Boost to
Series Regulator provided by Capacitor - This circuit
adds some capacitors and diodes to a traditional transformer type series regulator circuit to extend the normal
operating range. It can insure regulation during low line voltage conditions or it can squeeze a few more watts
out of a plug-in-the-wall power adapter power supply . . . [Hobby Circuit designed by David Johnson P.E.,
01/01/98]
Wide Band Zero Cross
Detector - This circuit was designed to convert a low
amplitude 40KHz signal into a clean square wave signal. It will work with inputs as small as 5mv peak-to-peak or
as large as 3 volts peak to peak. The input frequency can range from a few kilohertz to about 150 . . . [Circuit
by Dave Johnson P.E., 02/18/06]
Zero-Cross Detector-Wide Band - This circuit was designed to convert a low amplitude 40KHz signal into a clean square wave
signal. It will work with inputs as small as 5mv peak-to-peak or as large as 3 volts peak to peak. The input
frequency can range from a few kilohertz to about 150 . . . [Hobby Circuit designed by David Johnson P.E.,
02/18/06]
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