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Circuit provides Bidirectional variable speed Motor-control -
05/16/02 EDN-Design Ideas....During the development of systems that
include small motors, a simple, bidirectional motor controller with speed
adjustment may be helpful. Figure 1 shows such a controller. The
circuit....EDN is migrating links. This link is not verified. Search
the "title" EDN for new link. |
Circuit provides Class D motor-control - 1-May-03 Issue of EDN
Class D audio amplifiers provide a dual benefit for battery-powered
portable devices. They enhance battery life, and they produce much less
power....[Design Idea by John Guy, Maxim Integrated Products, Sunnyvale,
CA] |
Circuit provides efficient fan-speed control - 4-Mar-04 Issue of
EDN As Moore's Law plunges us into the realm of multigigahertz
processors and PCs with gigabytes of RAM, engineers face the task of
removing the heat that these state-of-the-art components produce. Cooling
such systems poses a dilemma. If you optimize the fan size and speed for
nominal operating conditions, the system is susceptible to failure when
conditions deteriorate....[Design Idea by John Guy, Maxim Integrated
Products, Sunnyvale, CA] |
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CMOS Toggle Flip Flop Using Push Button - The circuit below uses a CMOS dual
D flip flop (CD4013) to toggle a relay or other load with a momentary push button.
Several push buttons can be wired in parallel to control the relay from multiple
locations. A high level from the push button is coupled to the set line through a
small (0.1uF) capacitor. The high level from the Q output....[Bill Bowden's site] |
CNC Router Now this was an interesting project. |
CO2 Controller for planted tanks - (schematic / circuit added 2/07)
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Cold Activated Switch - The thermistor used has a resistance of
15k at 25 degrees and 45k at 0 degrees celsius. A suitable bead type
thermistor is found in the Maplin catalogue. The 100k pot allows this
circuit to trigger over a wide range of temperatures. A slight amount of
hysteresis is provided by inclusion of the 270k resistor. This
prevents relay chatter when temperature is near the switching threshold of
this circuit. (added 2/06) |
Combination-Controlled fully customizable RF remote Control -
(circuit added 1/07) |
Computer Controller for DC Motors - This circuit is easy to build
and use and it can control two DC motors of any current or voltage rating,
depending on the rating of the relays. The circuit also provides two shaft
encoders for positional feedback to the computer. (added 5/02) |
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Computer Fan speed tacho out circuit: Add a Fan speed monitor lead to any 12V two Wire
Fan. - Add a fan speed monitor lead to any 12V two wire fan. You will
find this identical circuit inside most 3 wire computer fans with speed monitoring
output to the motherboard. Peel off the sticker from the fan hub in order to
access a motor winding pin for connecting up the tacho circuit....[Circuit by Stepan
Novotill] |
Constant Brightness LED Stroboscope: for Measuring the Speed of Small Motors -
For measuring the speed of small motors. The rotary switch is available for
$5.00USD as of 2003 from DigiKey under part number EG1951-ND or EG1952-ND. It is a
real pain to operate this circuit without a proper switch. You can put multiple 4017
ring counters in series to reduce the duty cycle in order to obtain a more focussed
strobe image but you will have to increase L or by using a regulator to
power....[Circuit by Stepan Novotill] |
Constant Temperature Circuit - This circuit is a generic low power
temperature controller that can be used for stabilizing temperature sensitive
electronic circuits. It was built to stabilize a radio frequency VFO (Variable
Frequency Oscillator) for ham radio applications. The circuit has also been used to
lower the drift of a Ramsey FM10a micropower FM transmitter....(schematic / circuit
added 2/07) [G. Forrest Cook] |
Consumer STB/DVD - (application / block diagram added 6/07) |
Control 120VAC relay with TTL - ASCII format (electronic design added
02/03/04) |
Control stepping Motor via USB interface - This is an example that
demonstration how to control some devices via USB interface.The PC software program
with delphi. Feature:, CPU PIC18F4550 with full speed USB interface at 48MHz., USB 2.0
compliance, Use on-chip USB driver....(schematic added 7/08) |
Controlling 3-Phase AC Induction Motors using the PIC18F4431 - Microchip
Application Note Published 29-Jun-04 (app note added 2/06) |
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] |
Current loop interface - (diagram added 2/07) |
Current-sense IC Prevents OverCurrent Damage - 04/25/96 EDN-Design Ideas....EDN
is migrating links. This link is not verified. Search the "title" + "EDN" for
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