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Low/Mirco Power
Circuits Page 9
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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Ultra Low Power 32KHz Crystal Oscillator
I have used this circuit many times when I needed a low frequency reference, which
did not draw much power. With the components show, the current from a 3v
battery is less than 1.2 microamps.
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Ultra Low Power Astable Multivibrator
Taking advantage of some new voltage comparators, this circuit can produce a nice
square wave signal while drawing only 1.6 microamps. With the inclusion of a
diode, the circuit can also produce short pulses instead of a square wave signal.
(added 12/04)
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Ultra Low Power LED Flasher
NEW
The efficiency of some newer LEDs is
amazing. Some of the latest green LEDs can launch blinding light with just one
milliamp of current. I take advantage of one of these newer devices in the
circuit below. The flashing circuit uses a classic multivibrator oscillator, made
from a tiny National Semiconductor’s LMC7215 low power voltage comparator. The
circuit produces a short 10ms pulse every two seconds, drawing power from a 3v
supply. I suggest using a surface mounted green LED from Kingbright.....
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Universal Flasher using a Latching Relay
Latching relays are nifty devices. Most contain two 2separate coils.
When a voltage is applied to one coil the relay latches in one state and stays in
that state until voltage is applied to the unlatch coil. Since the latching
and unlatching pulses only need to last about 25 milliseconds, it is possible to
control a sizeable amount of power using little energy.
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UNPLUGGED POWER CORD ALARM
Many medical devices, such a portable X-ray and ultrasound equipment, carry their
own batteries. However, the frantic pace of some hospital emergency rooms might
cause the device to be shoved off into a corner without being plugged back into an
AC power source to recharge their batteries. So, I designed this circuit to emit an
audible alarm whenever the device’s power cord was unplugged from the wall for a
period of time. The device was designed to snap onto the outside of a power cord,
where it senses the AC electric field emitted. No direct connection to the internal
wires of the power cord is needed. I also included a low battery voltage monitor.
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Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
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Ultra Low Power 32kHz Crystal Oscillator - I have used this circuit many times
when I needed a low frequency reference, which did not draw much power. With the
components show, the current from a 3v battery is less than 1.2 microamps. …. [Designed by
David A. Johnson] |
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[_OLD-ads-dont_upload/OLD I-ADS from web/ad-djandassoc.htm] |
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Ultra Low Power Astable Multivibrator - Taking advantage of some new voltage
comparators, this circuit can produce a nice square wave signal while drawing only 1.6
microamps. With the inclusion of a diode, the circuit can also produce short pulses
instead of a square wave signal. (added 12/04) …. [Designed by David A. Johnson] |
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Ultra Low Power Latching Relay Circuit - The circuit below takes advantage of
some inexpensive small super capacitors. The circuit pumps 6 volt pulses into the
separate 5 volt latching and unlatching relay coils. A short 25ms pulse is all that
is needed to flip the relay states. A third super capacitor is used to supply a
higher peak current than a small lithium cell might otherwise be able to
supply....[Designed by David A. Johnson] |
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Ultra Low Power LED Flasher - The efficiency of some newer LEDs is amazing.
Some of the latest green LEDs can launch blinding light with just one milliamp of current.
I take advantage of one of these newer devices in the circuit below. The flashing circuit
uses a classic multivibrator oscillator, made from a tiny National Semiconductor’s LMC7215
low power voltage comparator. The circuit produces a short 10ms pulse every two
seconds, drawing power from a 3v supply. I suggest using a surface mounted green LED
from Kingbright....[Hobby Corner Circuit by Dave Johnson] |
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Ultra Low Voltage Micropower Crystal Oscillator Circuit - Circuit Ideas for
Designers Application Notes Advanced Linear Devices, Inc....[App Note] |
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Ultra Low Voltage Nanopower Inverter Circuit - Circuit Ideas for Designers
Application Notes Advanced Linear Devices, Inc....[App Note] |
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Ultra Low Voltage Nanopower LC Colpitts Oscillator Circuit - Circuit Ideas for
Designers Application Notes Advanced Linear Devices, Inc....[App Note] |
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Ultra Low Voltage Nanopower Two-Input NOR & NAND Gates - Circuit Ideas for
Designers Application Notes Advanced Linear Devices, Inc....[App Note] |
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Universal Flasher Using a Latching Relay - Latching relays are nifty devices.
Most contain two separate coils. When a voltage is applied to one coil the relay
latches in one state and stays in that state until voltage is applied to the unlatch coil.
Since the latching and unlatching pulses only need to last about 25 milliseconds, it is
possible to control a sizeable amount of power using little energy. …. [Hobby Corner
Circuit by Dave Johnson] |
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Unplugged Power Cord Alarm - Many medical devices, such a portable X-ray and
ultrasound equipment, carry their own batteries. However, the frantic pace of some
hospital emergency rooms might cause the device to be shoved off into a corner without
being plugged back into an AC power source to recharge their batteries. So, I designed
this circuit to emit an audible alarm whenever the device’s power cord was unplugged from
the wall for a period of time. The device was designed to snap onto the outside of a power
cord, where it senses the AC electric field emitted. No direct connection to the internal
wires of the power cord is needed. I also included a low battery voltage
monitor....[Designed by David A. Johnson] |
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Using Microchip's Micropower LDOs - Microchip Application Note Published
12-Nov-02 (app note added 2/06) |
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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 |
