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Low/Mirco Power
Circuits Page 8
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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Reflected Infrared Light Switch
This hobby circuit has been used in some museum displays and exhibits when the
electronics needed to trigger an audio/visual presentation is behind a plastic or
glass panel. A finger pressed against the glass, over a designated area
triggers the switch....
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Simple Security Wire Loop Alarm
A wire loop is used to protect valuable objects in this simple alarm circuit.
The electronic hobby circuit is powered by a 9v battery. The alarm beeper is
activated if the wire loop is severed. The standby current is so low that the 9v
battery should last for many years.
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Solid State Relay Requires Ultra Low Control Current
Most solid state relays require at least 5ma and often more input control current,
to fully turn on the device. But such current levels often force battery
powered circuits to use excessively large batteries. The relay hobby circuit
shown below demands only 50uA of input current. This about 100 times lower
than that needed by a typical optically isolated solid state relays. The
circuit uses a combination of a high current triac and a very sensitive low current
SCR, to control up to 600 watts of power to a load, while providing full isolation
and transient protection.
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THREE VOLT LOW BATTERY VOLTAGE FLASHER
This circuit is designed to monitor two alkaline cells (3v) that form the battery
often used in portable electronic equipment. It use an inexpensive IC from
Panasonic that is connected to an efficient LED flashing circuit. When the
battery voltage drops below a certain point the circuit flashes the LED. In
the off state the circuit draws only 1uA, while in the active flashing state it
draws 20uA. Published in EDN, Jan 2, 1997
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TIME TO DUST INDICATOR
I thought about this circuit when I heard that a lot cleaning personal in hotels
were either dusting rooms more often than necessary or not enough. I have not yet
built and tested this circuit completely but in concept it should work. The circuit
draws very low current from a +3v battery and could be housed in a package similar
to a small ashtray. The assembly might be placed in a suitable out of the way area
to collect dust. It would alert a maid when it was time to dust the room....
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Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
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Reflected Infrared Light Switch - This hobby circuit has been used in some
museum displays and exhibits when the electronics needed to trigger an audio/visual
presentation is behind a plastic or glass panel. A finger pressed against the glass,
over a designated area triggers the switch....[Hobby Corner Circuit by Dave Johnson] |
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Reset generator uses "fleapower" - 27-Jun-02 Issue of EDN When a
processor-controlled device must operate reliably, designers often choose to periodically
reset the processor rather than rely on a watchdog configuration. In low-power systems,
this periodic-reset circuit can consume a large part of the system's current budget or may
fail to operate at low voltages....[Design Idea by Philip Simpson, Maxim Integrated
Products, Reading, UK] |
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Simple Security Wire Loop Alarm - A wire loop is used to protect valuable
objects in this simple alarm circuit. The electronic hobby circuit is powered by a
9v battery. The alarm beeper is activated if the wire loop is severed. The standby
current is so low that the 9v battery should last for many years....[Hobby Corner Circuit
by Dave Johnson] |
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Simplify the Design of 1-Cell Li+ Battery-Operated Devices - Maxim App Note 4181
-- 3/20/2008 -- (app note add 5/08) |
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[_OLD-ads-dont_upload/OLD I-ADS from web/ad-djandassoc.htm] |
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Solid State Relay Requires Ultra Low Control Current - Most solid state relays
require at least 5ma and often more input control current, to fully turn on the device.
But such current levels often force battery powered circuits to use excessively large
batteries. The relay hobby circuit shown below demands only 50uA of input
current. This about 100 times lower than that needed by a typical optically isolated solid
state relays. The circuit uses a combination of a high current triac and a very
sensitive low current SCR, to control up to 600 watts of power to a load, while providing
full isolation and transient protection. …. [Hobby Corner Circuit by Dave Johnson] |
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SOT-23 Micropower Rail-to-Rail Op Amps Operate with Inputs Above the Positive Supply -
DN221 Design Notes (Linear Technology) (app note added 6/06) |
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Speedy logic translator uses little power - 12/31/69 EDN-Design Ideas....In
handheld equipment, component count and power consumption are critical considerations.
This Design Idea uses only a few transistors to configure a high-speed output stage of an
RS-232C link while draining few precious milliamperes from the batteries. In
general,....[File contains multiple circuits. Scroll to find this one.]....[Design
Idea by Davis Magliocco, CDPI, Scientrier, France] |
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Thermocouple Temperature Activates Relay - Voltage from a high temperature
thermocouple activates a relay when the sensor detects a temperature above 1000 degrees F.
…. [Designed by David A. Johnson] |
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ThinSOT Micropower Buck Regulator has Low Output Ripple - DN373 Design
Notes (Linear Technology)....[App Note] |
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Time to Dust Indicator - I thought about this circuit when I heard that a lot
cleaning personal in hotels were either dusting rooms more often than necessary or not
enough. I have not yet built and tested this circuit completely but in concept it should
work. The circuit draws very low current from a +3v battery and could be housed in a
package similar to a small ashtray. The assembly might be placed in a suitable out of the
way area to collect dust. It would alert a maid when it was time to dust the room. The
circuit detects dust with an infrared LED that is pulsed so its…. [Designed by David A.
Johnson] |
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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 |
