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Control Circuits  Page 11
Control Circuits: 
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Last Updated on: Monday, October 03, 2011 06:08 PM


Circuits Designed by Dave Johnson, P.E. :
  • 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.


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

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]
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]
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]
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)
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]
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]
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)
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]
Water-Level Controller -  (electronic Circuit / Schematic added 10/04)
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)
Welding High Power -  (application / block diagram added 6/07)
Well Pump Controller -  Find out how to automatically get water from the well into a header tank…. [REUK - Renewable Energy UK website]
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)
Wideband Agc Amplifier as a Differential Amplifier -  National Semiconductor Application Note 10-Apr-2000 (app note added 4/02)
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]
Wiper Speed Control -  (circuit / schematic design added 6/06)
Wireless RF PWM Dual Motor Controller -  (electronic circuit added 4/05)
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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