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Telephone Record Control - This circuit will allow you to connect
any tape recorder that has a mic and remote input to a phone line and
automatically record both sides of a conversation when ever the phone is in
use.You will need to take a couple of voltage readings before connecting the
circuit…. [Circuit designed by Randy Linscott] |
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TeleRemote Control - (circuit / schematic design added 6/06)
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Temperature Controled Fan - This circuit controls very accurately a
fan of any size. Just adjust the associated resistors for a different
type and you're all set. The above circuit diagram is for a small cpu-fan,
rated 12V at 12mA current…. [Tony van Roon's circuit] |
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Temperature Controlled NICD Charger - This circuit is for a
temperature controlled constant current battery charger. It works with NICD,
NIMH, and other rechargeable cells. The circuit works on the principle that
most rechargeable batteries show an increase in temperature when the cells
becomes fully charged. Overcharging is one of the main causes of short cell
life, hot cells pop their internal seals and vent out electrolyte. As cells
dry out, they lose capacity. [G. Forrest Cook] |
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Temperature Controlled Ovens - Here is a simple temperature
controller suitable for a variety of purposes; it was designed to heat the
copper float out of a toilet for a barometer!....(electronic circuit added
8/03) |
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Temperature controlled Triac for a fan - ….(Circuit design added
12/08) |
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Temperature controller has "take-back-half" convergence algorithm -
15-Sep-05 Issue of EDN Enhanced closed-loop control balances stability,
responsiveness.... [Design Idea by W Stephen Woodward, University of North
Carolina, Chapel Hill, NC; Edited by Brad Thompson and Fran Granville] |
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Temperature controller keeps IR detector at 8şK - 01/07/99 Issue of
EDN Sensitive infrared array detectors must operate at a low temperature
to avoid thermally generated dark current throughout the photoconductive
elements. This requirement is particularly true for SiAs array
detectors, which....Page includes several designs. Scroll to find this
one.... [Design Idea by Jerry Penegor, Space Sciences Laboratory, University
of California—Berkeley] |
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Temperature Monitor - Using a thermistor in the position shown makes
a heat activated sensor. A change in temperature will alter the output of the
opamp and energize the relay and light the LED. Swapping the position of the
thermistor and 47k resistor makes a cold or frost alarm.... [Andy Collison] |
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Temperature monitor & fan Controller reduce fan noise - 01-May-01
Issue of EDN The scheme in Figure 1 reduces system acoustic noise by
running system fans at their optimum speeds for a given temperature. IC1
combines ±1°C-accurate temperature measurement of three temperatures with
automatic fan-speed control of two channels. A two-wire serial interface
allows you to oversee critical temperature and fan-speed data.... [Design Idea
by David Hanrahan, Analog Devices Inc, Limerick, Ireland] |
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Temperature Monitor/Controller: AVR 2313/DS1621 - So, I designed
this little device which could monitor the temperature and control the heater…
[Jesper Hensen] |
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Temperature Programmer uses Digital Control - 07/18/96 EDN-Design
Ideas EDN is migrating links. This link is not verified.
Google the "title" EDN for new link. |
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Temperature Regulator intricate-ms - (electronic circuit added 5/02)
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Temperature Sensitive Oscillator - Temperature controlled based on
AT89CX051 (added 6/03) |
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Temperature Sensor Control - A basic circuit using Diodes to detect
temperature differences....(design added 12/08) |
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Temperature-measurement scheme uses
IR sensor and sigma-delta ADC - 3-Apr-03 Issue of EDN Many
noncontact temperature-measurement systems use infrared sensors, such as
thermopiles, which can detect small amounts of heat radiation. Biomedical
thermometers that measure the temperature of an ear or a temple use noncontact
temperature measurement, as do automotive-HVAC systems that adjust temperature
zones based on the body temperature of passengers.... [Design Idea by Albert
O'Grady and Mary McCarthy, Analog Devices, Limerick, Ireland] |
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The HC11 Controls the Stepper - (circuit / schematic design added
07/08/09) |
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The Smart Start ™ Technique for BLDC Motors/ ABR-42020 - Fairchild
Application Notes / (app note added 6/06) |
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The Subscriber Line Card in a Distributed Control Switching System -
National Semiconductor Application Note (app note added 6/06)
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Theremin Controller - (circuit / schematic design added 6/06)
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Thermal Cooling Fan Controller - As we begin to enjoy those lazy
hazy days of summer, the most important thing on most of our minds is how to
keep cool during those hot days. For some of us that means turning up the old
air conditioner and sipping on a nice cold glass of our favorite soft drink.
However, we often forget about an equally important.... [Radio Amateur
Society of Norwich] |
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Thermal Fan Controller (Rod Elliott (ESP)) - Excellent addition to
your laboratory power supply (circuit added 11/06) |
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Thermistor Temperature Controller - ….(Circuit design added 12/08)
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Thermo Alarm - The Th1 thermistor is a regular NTC (Negative
Temperature Coeficient) of about 1000 ohms. But other types will work
too. Adjust the sensitivity with the 20K trim-pot P1. When the
thermistor is at operating temperature, the resistance is high The 330K
resistor (R3) is to introduce a little bit hysteresis back on the basis of Q2
to prevent relay chatter.... [Tony van Roon's circuit] |
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Thermo Cooling Fan - Use a 12V computer fan to cool your amp.
Uses diode temperature sensor f (added 5/02) |
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Thermocouple Signal Conditioning Using the AD594/AD595 - AN-369
Analog Devices Application Note (app note added 6/06) This application
note reviews thermocouple basics and illustrates Circuit designs for
thermocouple signal conditioning using the AD594/AD595. |
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Thermoelectric Controller Scriptable Thermometer - A unified
thermometric controller that can be programmed with simple scripts,
integrating the "classic" thermometer/controller pair. You can build a variety
of simple machines with the same hardware and a different script : a charting
thermometer, a vending machine that dials your number when empty, a leavening
cell.... (added 09/05) |
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Thermostat Control for Electric Heaters - ….(electronic schematic
added 12/08) |
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Thermostat for 1KW Space Heater SCR controlled - Here is a simple
thermostat circuit that can be used to control a relay and supply power to a
small space heater through the relay contacts. The relay contacts should be
rated above the current requirements for the heater. Temperature changes are
detected by a.... (added 6/06) |
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Thermostat, #2 - The R2 thermistor is a regular NTC (Negative
Temperature Coeficient) of about 1000 ohms. But other types will work
too. Adjust the sensitivity with the 10K trim-pot P1. When the
thermistor is at operating temperature, the resistance is high.... [Tony van
Roon's circuit] |
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Thermostat, #3 - The LM3911 requires only a few resistors and
capacitors to turn it into a full-function temperature controller. The
schematic diagram illustrates the simplicity of the overal circuit. The
resistor network consisting of R1, R2, and R3 are used to provide the set
point voltage for the feedback input of the LM3911.... [Tony van Roon's
circuit] |
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Three-Phase Brushless Motor RPM Controller - The TPIC43T01/02 is a
monolithic motor control integrated Circuit designed to provide RPM control to
a 3-phase brushless dc motor. The device provides two analog sensor input
ports which include a speed sensor interface and a Hall effect position
interface. The speed feedback interface consists of an FG amplifier to receive
an external sinusoidal signal.... (application note added 10/06) |
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Time-delay relay uses proximity control - 03/15/01 EDN-Design Ideas
You can build a circuit that allows a passerby to briefly operate model trains
in a display window (Figure 1). The design uses a proximity detector rather
than a pushbutton switch to eliminate the need to mount and wire any equipment
outdoors. The circuit worked well.... [Design Idea by Dennis Eichenberg, Parma
Heights, OH] |
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Timer automatically shuts off - 08/17/00 EDN-Design Ideas The
circuit in Figure 1 is a programmable power switch that offers on-state
periods of 5 sec to three hours. It consumes zero power in the off state and
has zero voltage drop in the on state. S1 is a power-on switch. When you press
S1, the battery powers an eight-pin PIC12C508 µC.... [Design Idea by Yongping
Xia, Teldata Inc, Los Angeles, CA] |
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Timer controls DSP filter frequency resolution - 04/13/95 EDN-Design
Ideas....EDN is migrating links. This link is not verified. Search the
"title" EDN for new link. |
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Tiny Robot - Recently many kind of robot contests have being opened
and some interesting reports of the challenge are found on the web. The Line
Following is a kind of the robot contests to vie running speed on the line. I
build a tiny line following robot which can run on the desk, moving the key
board aside will do. It is for only a personal toy reduced i.... (added
9/04) |
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TinyIR Learning IR Remote Control Receiver - Adding IR remote
control to your next project, or to an existing one just got a whole lot
easier. With TinyIR, just apply power, train the chip to recognize the key
codes you want to use, and you're ready to go. Code patterns are safely stored
in internal non-volatile EEPROM. The chip can be re-trained many times if
needed.... (electronic circuit added 6/07) |
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Tone Control - Based on the classic Baxendall tone control circuit,
this provides a maximum cut and boost of around 10dB at 10K and 50Hz. As the
controls are passive, the last transistor provides a slight boost. The
output…. [Designed by Andy Collison] |
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Touch-activated timer switch extends battery life - 10-Jul-08 Issue
of EDN Designed to fit into the battery compartment of an optical mouse,
this circuit automatically shuts off the battery after a time delay....
[Design Idea by Israel Schleicher, Prescott Valley, AZ] |
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Touch-controlled Dimmer - Here’s a dimmer that, besides being
touch-controlled, also has a setting memory that enables it, for example, to
turn the lighting on at the level you had set last time it was turned off. The
project uses a specialized IC, an LS7534 from LSI Computer Systems, available
from Farnell, among others.….must register on this site... [Published in
Elecktor July/August 2010] |
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Trace dimension control reduces crosstalk - 02/17/97 EDN-Design
Ideas....EDN is migrating links. This link is not verified. Search the
"title" EDN for new link. |
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Traffic Light Control Circuit 74145 - This page features a circuit
that has twenty open collector outputs that turn on one at a time in a
continuous sequential manner. The circuit make use of the 74LSxx family of TTL
integrated logic devices. The circuits… [from Rob Paisley's Model Train web
site] |
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Traffic Light Controller - controls on3 LED traffic light sequence
(added 7/03) |
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TRIAC Light Controller - This project is intended for controlling
mains powered disco lighting, although there are many other possible uses for
controlling almost any mains appliance. It will control five seperate channels
at up to 3 Amp per channel. This could be increased by designing another
PCB with wider tracks than the PCB included with this design.... [Matthew
Hewson's circuit] |
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Triac lighting and heating controller uses few parts - 2-Sep-04
Issue of EDN The triac lighting-control circuit in Figure 1 is small and
inexpensive because load and housekeeping power come directly from the line
voltage, thereby eliminating bulky, expensive supplies. The CLZD010
closed-loop controller maintains constant light intensity by automatically
adjusting the timing of the triac's firing until the feedback signal and
setpoint command are equal.... [Design Idea by David Caldwell, Flextek
Electronics, Carlsbad, CA] |
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Turn on the aquarium lights every day at the same time - Turn on the
sprinkler or the aquarium lighting for the same period of the day. You can
choose to operate the output by every 2nd, 3rd day only. There is a manual
start/stop button to immediately turn on or off the output, and a disable
button to completely turn off automatic operation.... [Peter Jakab, Electrical
Engineer, Engineer of Informatics] |
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Two Button 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. …. [Hobby Corner Circuit by Dave Johnson] |
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Two chips simplify layout for high-end embedded control - 04/01/99
Issue of EDN If you are considering using one of the 32- or 64-bit RISC
µPs from Integrated Device Technology (IDT], the company’s new RC32134 and
RC64145 system-controller ICs (Picture] can make your job easier. The chips
provide synchronous-DRAM, memory, and I/O control; a PCI interface; and
peripherals, including UARTs, timers, and interrupt controllers. The 32134 for
the RC32364 µP provides a glueless interface to DRAM....Page includes several
designs. Scroll to find this one.... [Design Idea by Graham Prophet] |
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Two Components Drive Stepper Motor - 01/19/95 EDN-Design Ideas....EDN
is migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
|
Two Light Controlled Relays - These two circuits use LDRs (Light
Dependent Resistors). Circuit No.1 energizes the relay when the light rises
above a preset level. Use it to switch things on at dawn. Circuit No.2
energizes the relay when the light falls below a preset level. Use it to
switch things on at dusk. [Circuit designed by Ron J.] |
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Two Signals Easily Control Tricolor LED - 09/14/95 EDN-Design
Ideas....EDN is migrating links. This link is not verified. Search the
"title" EDN for new link. |
|
Two Temperature Controlled Relays - These two circuits use
Thermistors (Temperature Dependent Resistors). Circuit No.1 energizes the
relay when the temperature rises above a preset level. Use it to switch things
on when it gets hot. Circuit No.2 energizes the relay when the temperature
falls below a preset level. Use it to switch things on when it gets cold. [Ron
J.] |
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Two Wire Remote Microphone Amplifie - uses special amplifier module
from Op-Amp Labs (added 4/02) |
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Two Wire Stepper Motor Positioner - A simple and inexpensive way to
remotely rotate a display or object is with a positioner that uses a stepper
motor to rotate it. The motor is driven by a circuit mounted near the motor
and by a control circuit at a remote location….. [free schematic from
Golab.com] |
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Two-wire Lamp Flasher (redcircuits) - This circuit has been designed
to provide that continuous light lamps already wired into a circuit, become
flashing. Simply insert the circuit between existing lamp and negative supply.
Especially suited for car or panel pilot lights, this device can drive lamps
up to 10W.... (design added 10/06) |
