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Low/Mirco Power
Circuits Page 10
Low Power (flea power): #'s
1.5-2, #'s 3-A,
C-E, F-K,
L, M,
N-Q, R-T,
U, V-Z
Last Updated on:
Wednesday, December 20, 2017 05:05 AM |
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Circuits Designed by Dave Johnson, P.E. : |
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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. The method keeps the
standby power consumption to a very low 1uA when used with a 3v supply.
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Very Low Voltage Oscillator
OK, you may not ever need an oscillator to function using a power supply voltage
below one volt, but if you ever do need one, here is one way to do it. Getting any
electronic circuit to operate below one volt is a real challenge....
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WATER SEEPAGE ALARM
This simple circuit sounds a
beeper when its electrodes detect water. It is powered by a single 1.5v N cell. A
small 1.5v button battery will also work.
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XENON LAMP FLASH DETECTOR
This circuit uses a small 2.5mm square photo diode in
conjunction with a 100mH coil to detect the short light flashes from a xenon lamp.
The coil makes the circuit immune to normal room lights. Its 10mv sensitivity
can detect light flashes from a range of over 100 feet. Reflections from a
room’s walls and ceiling is usually enough to trigger the circuit. The entire
circuit draws only 3 Microamps from a 6 to 9 volt battery.
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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Versatile Micropower Voltage Reference Provides Resistor Programmable Output from 0.4V to
18V - DN351 Design Notes (Linear Technology) (app note added 1/06)
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[_OLD-ads-dont_upload/OLD I-ADS from web/ad-djandassoc.htm] |
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Very Low Power Astable Multivibrator - This classic circuit draws only 200
nanoamps from a 1.5v supply....[Designed by David A. Johnson] |
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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. The method keeps the standby power consumption to a very low 1uA when used with
a 3v supply. …. [Designed by David A. Johnson] |
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Very Low Voltage Oscillator - OK, you may not ever need an oscillator to
function using a power supply voltage below one volt, but if you ever do need one, here is
one way to do it. Getting any electronic circuit to operate below one volt is a real
challenge. Typical silicon bipolar transistors don’t work below 0.7 volts.
Some old germanium transistors do work down at low voltages but those are hard to find and
are usually offered only in large packages....[Hobby Corner Circuit by Dave Johnson] |
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Volt/F Converter Draws Flea Power - 04/24/97 EDN-Design Ideas....The V/F
converter in Figure 1 is unique because it draws less than 30 µA from one unregulated
supply while converting bipolar input voltages. It produces three CMOS-compatible,0to
10-kHz outputs one (F+]that becomes active when the input voltage is positive,
another (F]that takes....[Design Idea by W Stephen Woodward, University of North
Carolina, Chapel Hill, NC] |
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Water Flowing in Pipe Indicator - The vibrations associated with water flowing
through a pipe are picked up by an inexpensive piezoelectric wafer. The signal from
the wafer is first boosted by a micropower transistor amplifier and then fed to an ultra
low power voltage comparator. When the vibration signal has sufficient
amplitude, a FET transistor switch is activated. Drawing only 6uA, the whole circuit
is powered by a lithium coin battery, which should power the circuit for many
years....[Designed by David A. Johnson] |
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Water Seepage Alarm - This simple circuit sounds a beeper when its electrodes
detect water. It is powered by a single 1.5v N cell. A small 1.5v button battery will also
work. …. [Designed by David A. Johnson] |
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Wideband Op Amp Capable of µPower Operation - National Semiconductor Application
Note 24-Oct-2001 (app note added 6/06) |
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Wireless battery energizes low power devices - 22-Nov-07 Issue of EDN A
simple 13.56-MHz oscillator broadcasts power to a receiver circuit....[Design Idea by
Carlos Cossio, Santander, Spain] |
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Xenon Lamp Flash Detector - This circuit uses a small 2.5mm square photo diode
in conjunction with a 100mH coil to detect the short light flashes from a xenon lamp.
The coil makes the circuit immune to normal room lights. Its 10mv sensitivity can
detect light flashes from a range of over 100 feet. Reflections from a room’s walls
and ceiling is usually enough to trigger the circuit. The entire circuit draws only
3 Microamps from a 6 to 9 volt battery. …. [Designed by David A. Johnson] |
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Zero-Bias Detector Yields High Sensitivity Weith Nanopower Consumption - Linear
Technology Magazine Design Ideas February 1998 (app note added 2/05) |
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Low Power (flea power): #'s
1.5-2, #'s 3-A,
C-E, F-K,
L, M,
N-Q, R-T,
U, V-Z |
