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Control
Circuits Page 11
Control Circuits:
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Last Updated on:
Monday, October 03, 2011 06:08 PM |
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| Circuits
Designed by Dave Johnson, P.E. : |
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Two 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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Links to electronic
circuits, electronic schematics, designs for engineers, hobbyists, students &
inventors:
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Watchdog circuit protects against loss of battery charger's control
signals - 21-Jul-05 Issue of EDN Hardware circuit
keeps software-based charging within limits.... [Design Idea by Andy
Fewster, Maxim Integrated Products Inc, Hampshire, UK; Edited by Brad
Thompson and Fran Granville] |
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Watchdog circuit uses ac triggering - 16-Aug-01 Issue of EDN
A dc-triggered reset of a watchdog circuit is prone to failure. If the
watchdog program hangs up, .... [Design Idea by Shyam Tiwari, Sensors
Technology Private Ltd, Gwalior, India] |
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Watchdog Circuit uses Leftover Gates - 08/01/96 EDN-Design
Ideas The reset and µP-controlled watchdog circuit in Figure 1 a
makes good use of some unused inverter gates in IC1. The design is
extremely simple..... [Design Idea by Shyam Sunder Tiwari, IGCAR,
Kalpakkam, India] |
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Watch-Dog for Telephones - Most of the telephone security
devices available in market are simple but quite expensive. These
devices provide blinking or beeping type line-tap/misuse indications
….(electronic schematic added 11/08) |
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Watchdog reset catcher aids embedded system debugging - 11/19/98
EDN-Design Ideas A simple "junk-box" circuit uses a 4013 CMOS
flip-flop and a handful of passive components to determine whether random
resets are the result of a blown stack or the result of the watchdog-reset
circuit tripping (Figure 1]. You can also use this circuit to "grab" and
hold.... [Design Idea by Scott Newell, PCSI, Fort Smith, AR] |
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Watchdog Time Out is Independent of Reset - 09/01/95 EDN-Design
Ideas Many embedded systems use µP supervisors with on-chip watchdog
timers. Some supervisors, such as the MAX691, allow you to select different
watchdog and reset time-out periods, depending on how you connect pin 7 (Osc
In] and pin 8 (Osc Sel]. Table 1 in the MAX691 data sheet indicates the
available watchdog and reset time-out choices. However, when you implement....
[Design Idea by Larry Buyan, Criticare Systems Inc, Waukesha, WI] |
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Watchdog timer allows entry to test-mode - 19-Jul-01 Issue of EDN
Manuals for microprocessor-based devices often include instructions for
entering a "secret mode" in which you can test or reset the device. These
instructions typically ask you to depress and hold one or two switches for a
minimum time interval. You can adopt several measures to avoid accidentally
triggering the test mode Depress two keys, hold both keys simultaneously
and continuously throug.... [Design Idea by Greg Sutterlin and Larry Barnes,
Maxim Integrated Products, Sunnyvale, CA, and Craig Gestler, Mining Safety
Appliances Co, Mars, PA] |
| Watchdog Timer Assumes Varied Roles -
The following application note demonstrates alternative uses for the
MAX6369-MAX6374 family of pinselectable watchdog timers. Alternative uses
include a power saving power-on LED indicator circuit, load connect/disconnect
circuit and push-button reset circuit. (Maxim APPLICATION NOTE 582)
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Watchdog Timer Reboots PC's - 06/05/97 EDN-Design Ideas When
you use a PC to control a process or collect data, it's often desirable to
have a watchdog timer reboot the computer if it runs astray. The circuit in
Figure 1 uses a PIC16C84.… [Design Idea by Charles Hamilton, Burr-Brown Corp,
Tucson, AZ] |
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Water-Level Controller - (electronic Circuit / Schematic added
10/04) |
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Welch Scientific Model 2153c Stroboscope - a schematic for a typical
line operated variable rate stroboscope used for the visualization of moving
parts as well as rotation speed or frequency determination of rotating or
vibrating machinery (added 4/02) |
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Welding High Power - (application / block diagram added 6/07)
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Well Pump Controller - Find out how to automatically get water from
the well into a header tank…. [REUK - Renewable Energy UK website] |
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White LED Head Lamp - A white LED head lamp which can operate with
only two AA batteries. The LEDs are driven in constant current, so that the
brightness is maintained until end of battery life. (added 6/06)
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Wideband Agc Amplifier as a Differential Amplifier - National
Semiconductor Application Note 10-Apr-2000 (app note added 4/02) |
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Wideband AGC has 60 DB Dynamic Input Range - 10/10/96 EDN-Design
Ideas: Automatic-gain-control (AGC] circuits serve in many applications to
maintain signals at fixed levels. However, in applications such as
digital-receiver circuits and back-channel modems, the function of the AGC
often aims more at increasing dynamic input range through the controlled
application of both gain and attenuation. In this type of application, the AGC
is usually upstream of a high-speed ADC. The.... [Design Idea by Carl Dickey,
National Semiconductor, Comlinear Division] |
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Wiper Speed Control - (circuit / schematic design added 6/06)
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Wireless RF PWM Dual Motor Controller - (electronic circuit added
4/05) |
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ZXBM200x Series of Variable Speed 2-Phase Fan Motor Controller -
Zetec Semiconductors Applications NotesThis applications document is
intended to aid users in their development of the controller electronics for
fan and blower motors using the ZXBM200x series of variable speed, 2-phase, DC
brushless motor controllers. (app note added 6/06) |
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Control Circuits:
#-B
C
D-G
H-I
J-O
P-Q
R
S
T
U-V
W-Z
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