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Control
Circuits Page 1
Control Circuits:
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Last Updated on:
Monday, October 03, 2011 06:07 PM |
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Circuits Designed
by Dave Johnson, P.E. : |
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1W White LED Night Light
As many of
you know, I have a pet peeve with poorly made LED night lights. Often, the
light from the LED quickly fades, so within months, the light is useless.
I have posted several versions of modified night lights using higher quality
components.....i
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2 Pushbutton Motor Controller
Two small pushbutton switches, a few diodes and two relays form a method to
control on/off power to a brush motor as well as the motor direction. The
circuit was originally designed for a motorized lifting platform.
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- 9v
POWERED XENON PHOTOFLASH Controller
This 9v battery powered circuit is designed for remote control flash needs. A
charge control circuit turns off the high voltage generator when the photoflash
capacitor is fully charged. A neon lamp is included to indicate when the system
is ready to flash.
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12V Cooling Fan
Thermostat
This circuit
will turn on a 12v DC powered cooling fan when the air temperature reaches a
certain high temperature and will keep the fan turned on until the temperature
drops below a second lower level. Both the high and low temperatures are
both adjustable. For ease of use, the temperatures are proportional to
either degree F or degrees C, using an accurate electronic sensor.......
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- Automatic
DC Motor Brake
In many DC motor powered systems you would like the motor to quickly come to a
full stop. This circuit provides an automatic electronic braking action to
any DC motor ranging from 6v to 24v up to 1 amp of current. Some of the
component values could be changed for larger motors....
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Links to electronic
circuits, electronic schematics, designs for engineers, hobbyists, students &
inventors:
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"H" Bridge Direct Current Motor Control Circuit (LM311) -
This page features H-Bridge circuits used for controlling direct
current motors.….scroll to view all of the circuits…. [from Rob
Paisley's Model Train web site] |
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µC Acts as Dedicated Motor-control - 09/11/98 EDN-Design
Ideas Motion-control systems often use a PWM signal to control
the duty cycle for a motor driver or amplifier module.….Please scroll
to find this circuit.… [Design Idea by [Dylan Horvath, Gecko Sysytems
Inc, Austin, TX] |
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µC controls charge pump as background task - 1-Aug-97 Issue
of EDN Because of power consumption and cost, designers of
battery-powered devices mainly choose components that run at 3V or
lower. Unfortunately, many devices operate only at 5V, including LCDs
with built-in drivers, programming lines of many EEPROMs and flash
chips, and CMOS ADCs.... [Design Idea by Carlos Cossio, Santander,
Spain] |
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µC Controls Digital Potentiometer - 10/08/98 EDN-Design
Ideas Many digitally controlled potentiometers (for example, the
LM1971/02/3 from National Semiconductor, www.national.com]incorporate
a three-wire serial digital interface...[Design Idea by Lukasz
Sliwczynski, University Of Mining And Metallurgy, Krakow, Poland] |
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µC implements Pushbutton Light Dimmers - 06/18/98 EDN-Design Ideas
A project required building a synchronous-demodulator circuit to track a line
drawn on paper. beauty of synchronous-modulator/demodulator
approach is its inherent noise rejection. method rejects ….File contains
several circuits, scroll to find this one.... [Design Idea by William Grill,
Riverhead Systems, Littleton, CO] |
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µC Provides Wireless Keypad Control - 10/08/98 EDN-Design Ideas
Portable systems, such as telephone handsets, make extensive use of
low-dropout (LDO]regulators. se components provide noise-sensitive parts with
a stable power-supply line....Scroll to find this specific article.... [Design
Idea by Lloyd Khuc, Motorola Inc, Austin, TX] |
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0 to 10 Volt Control for RC Servos - In this circuit NE555 is
configured as astable multivibrator. main timing capacitor (220 nF) is
always changed to voltage level which is determined by voltage on
NE555 pin 5 (in this circuit that voltage is aroun 1.6V). When timing
capacitor.... (electronic schematic / circuit added 4/02) |
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10 Channel LED Sequencer - The 4017 is a CMOS decade counter with 19
decoded outputs. Inputs include a RESET (pin 15), and a CLOCK INHIBIT
(pin 13). The clock input drives an inte….Circuit design added 06/09)
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120 VAC Lamp Dimmer - The full wave phase control circuit below was
found in a RCA power circuits book from 1969. The load is placed in series
with the AC line and the four diodes provide a full wave rectified voltage to
the anode of a SCR. Two small signal transistors are connected in a switch
configuration so that when the voltage on the 2.2uF....(circuit added 7/02)
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120 Volt AC Lamp Dimmer Full Wave SCR - (circuit / schematic design
added 6/06) |
12V Cooling Fan
Thermostat
This circuit
will turn on a 12v DC powered cooling fan when the air temperature reaches a
certain high temperature and will keep the fan turned on until the temperature
drops below a second lower level. Both the high and low temperatures are
both adjustable. For ease of use, the temperatures are proportional to
either degree F or degrees C, using an accurate electronic sensor.......[circuit
designed by david johnson] |
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12V Fluorescent Inverter - Build this 20 watt Fluoro Inverter,
it drives two 20-watt tubes or a 40-watt tube!….(electronic circuit added
04/09) |
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12V PWM Motor/Light Controller - The diagrams are for 12V operation
only and there are high side (common ground) and low side (common +12V)
versions. The low side version of the circuit uses an N Channel FET, the high
side version of the circuit uses a P Channel FET. N Channel devices tend to
handle more current than P Channel devices, they are also less expensive. The
high side version of the circuit is useful when one side of the load has to be
grounded.... [G. Forrest Cook] |
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12VDC Fluorescent Lamp Driver - A number of people have been unable
to find the transformer needed for the Black Light project, so I looked around
to see if I could find a fluorescent lamp driver that does not require any
special components. I finally found one in Electronics Now....(electronic
design added 6/07) |
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12vDC Sump Pump Control - A simple control to turn on and off a 12v
DC sump pump (like a boat bilge pump) as water level rises in the sump….
[Circuit Design by Burton Lang] |
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12-volt Cellar Drain Pump - This circuit lets you control a pump, to
keep the level of water in a cellar below a certain threshold, for example.
Power is supplied to the pump by a battery that is recharged automatically
when the AC powerline voltage is present…requires login to see circuit...
[Published in Elecktor July/August 2010] |
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13 Volt Differential Temperature Controller - for hot water and hot
air system control [G. Forrest Cook] |
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14 Volt Strobe Circuit - this circuit uses12V DC instead od mains
AC. This is very good idea if you don't want to mess with direct mains
voltage connected circuit or you want to run stroboscope from batteries.
(added 4/02) |
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16 Stage Bidirectional LED Sequencer - The bi-directional sequencer
uses a 4 bit binary up/down counter (CD4516) and two "1 of 8 line decoders"
(74HC138 or 74HCT138) to generate the popular "Night Rider" display. A Schmitt
Trigger oscillator provides the clock signal for the counter and the rate can
be adjusted with the 500K pot. Two additional Schmitt Trigger inverters are
used as a SET/RESET latch to control the counting direction (up or down). Be
sure to use the 74HC14 and not the 74HCT14, the 74HCT14 may not work due to
the low TTL input trigger level. When the highest count is reached (1111) the
low output... [Bill Bowden's website] |
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1W White LED Night Light - As many of you know, I have a pet peeve
with poorly made LED night lights. Often, the light from the LED quickly
fades, so within months, the light is useless. I have posted several
versions of modified night lights using higher quality components. This
circuit is yet another version, which produces much more light than those
other designs. The circuit brings together two high power white LEDs made by
Cree with a compact AC to DC power supply from Bias Power.... [Designed by
David A. Johnson] |
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1-Wire network controls remote SPI peripherals - 4-Sep-08 Issue of
EDNThis circuit controls a remote LED display by the 1-wire network through an
SPI-compatible display controller.... [Design Idea by Michael Petersen, Maxim
Integrated Products, Colorado Springs, CO] |
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Control Circuits:
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