Control Circuits #-B

Control Circuits Page 1-c
Control Circuits: #-B C D-G H-I J-O P-Q R S T-Z
Last Updated on: Thursday, November 30, 2017 01:57 PM

Circuits Designed by Dave Johnson, P.E. :

AC Current Controls Hour Meter - Many systems require routine maintenance based on machine operation time. The circuit below is a simple way to turn on a hour meter whenever AC power is supplied to the machine. An inexpensive snap-on current transformer from Magnetics Inc, is used to detect the AC current. The output of the transformer is fed to a voltage doubler circuit. When 0.5 AC amps or more of current is flowing, the circuit generates sufficient voltage to turn on the n-channel MOSFET. Once tuned on, the transistor routes voltage to the hour meter. Some hour meters contain their own battery, so no external power is needed. In those cases, the transistor switch alone will turn on the hour meter.

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

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A Stereo Digital Volume Control based on the CS3310 - The CS3310 is a complete stereo digital volume control designed specifically for audio systems....(data sheet added 07/07)

A Temperature controlled Triac for a fan - ….(Circuit design added 12/08)

A Temperature Sensor Control - A basic circuit using Diodes to detect temperature differences....(design added 12/08)

A Thermistor Temperature Controller - ….(Circuit design added 12/08)

A Thermostat Control for Electric Heaters - Two practical replacement for heaters with problemsor an add on....(Circuit design added 12/08)

A Transformerless Power Supply - This circuit will supply up to about 20ma at 12 volts. It uses capacitive reactance instead of resistance, so it doesn't generate very much heat..... [Circuit Designed by Ron J.]

A worked Stepping Motor Example - Perhaps some of the most commonly available stepping motors, for the experimenter, are the head positioning motors from old diskette drives.....(Circuit design added 09/08)

ABR-42020/ The Smart Start ™ Technique for BLDC Motors - Fairchild Application Notes / (app note added 6/06)

AC Current Controls Hour Meter - Many systems require routine maintenance based on machine operation time. The circuit below is a simple way to turn on a hour meter whenever AC power is supplied to the machine. An inexpensive snap-on current transformer....[Designed by David A. Johnson]

AC Induction Motor Fundamentals - Microchip Application Note Published 18-Dec-03 (app note added 2/06)

AC Servo Motor Windmill - A windmill built around a 3 phase servo motor from an old welding robot.

Achieve precision temperature control with TEC Seebeck voltage sampling - 27-Nov-08 Issue of EDN By periodically setting the TEC's drive to zero, a storage capacitor samples and holds the Seebeck voltage.... [Design Idea by W Stephen Woodward, Chapel Hill, NC]

Active FM Antenna Amplifier - This amplifier will pull in al distanat FM stations clearly. The circuits is configured as a common-emmitter tuned RF preamplifier wired around VHF/UHF transistor Q1…. [Tony van Roon's circuit]

ActiveX control brings-bit Manipulation to Windows - 05/25/00 EDN-Design Ideas Nothing compares with the C language for working with bits. C provides a rich set of signed and unsigned number formats, along with many intrinsic bit-manipulation operators. However, most of the popular rapid-application-development Windows languages.... [Design Idea by Steve Hageman, Agilent Technologies, Santa Rosa, CA]

AD5227 Evaluation Kit for the 64-Position, Up/Down Control Digital Potentiometer - AN-711 Analog Devices Application Notes (app note added 6/06)

AD5228 Evaluation Kit for the 32-Position, Push Button, Up/Down Control Digital Potentiometer - AN-712 Analog Devices Application Notes (app note added 6/06)

Adaptive Windscreen Wiper Control - (diagram added 6/03)

ADC controls multiple stepper-motors - 09/14/00 EDN-Design Ideas Typical stepper-motor control circuits use either logic gates and flip-flops or shift registers to generate the proper sequences of binary codes that produce bidirectional stepper-motor movement. A conventional stepper-motor-control circuit uses a square-wave generato.... [Design Idea by K Suresh, Indira Gandhi Centre for Atomic Research, Kalpakkam, India]

Add a manual reset to a standard three pin reset supervisor - 12-Apr-07 Issue of EDN Simply adding a couple of resistors, a capacitor, and a pushbutton switch transforms a standard three-pin-reset supervisor into a manual reset.... [Design Idea by Derek Vanditmars, Delta Controls, Surrey, BC, Canada; Edited by Charles H Small and Brad Thompson]

Adjustable Voltage Motor Controller - One of the nice things about flying electric is you can test run your motor in the house, workshop, or in the yard and the neighbors won't complain. The problem is how to control the speed of the motor. One way is to use the plane, radio, and speed control with the motor in it. That's no fun!....(electronic circuit added 4/05)

ADM1070 Hot Swap Controller - AN-591 Analog Devices Application Note (app note added 2/06) This App Note Describes Operation of ADM107)0 Under Various Hot Swap Insertion and Removal Conditions.

ADN8830-EVAL TEC Controller Instructions - AN-705 Analog Devices Application Notes (app note added 6/06)

ADT7463 Configurations - AN-612 Analog Devices Application Note (app note added 2/06)

Advanced TCA Hot Swap Controller Eases Power Distribution - DN353 Design Notes (Linear Technology) (app note added 2/06)

Air FLow Control using Fuzzy Logic - Microchip Application Note Published 26-Aug-97 (app note added 2/06)

Alarm control keypad - The IC is a quad 2 input "AND" gate, a CMOS 4081. These gates only produce a HIGH output, when BOTH the inputs are HIGH. When the key wired to 'E' is pressed, current through R1 and D1 switchs Q5 on.The relay energises; and Q5 is 'latched on' by R8. Thus, the Alarm is set by pressing a single key, say one of the two non-numeric symbols.... [Ron J.'s circuit]

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#-B's continued

Control Circuits: #-B C D-G H-I J-O P-Q R S T-Z