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Circuit Controls Stepper Motors - 01/08/04 EDN-Design Ideas: Stepper motors are
useful in many consumer, industrial, and military applications. Some, such as
personal-transportation systems, require precise speed control. Stepper-motor
controllers can be simple (Figure 1), but they require a variable-frequency square
wave for the clock input. The AD9833 low-power DDS (direct-digital-synthesis)IC
with.....(design idea added 1/05) |
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Circuit forms DC Motor Switch with Brake - 01/10/02 EDN-Design Ideas: controlling
a small dc motor without speed control sounds like a trivial task; a switch or a relay
should suffice. However, several problems accompany this approach. For one, the
switch, because of the inductive load and the low starting resistance of the motor,
tends to wear out prematurely (with all the related sparks and EMI
problems).....(design idea added 1/05) |
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Circuit Generates Analog Fan Speed Control - Maxim-IC Appnote #1125 / (app note
added 5/08) -This circuit delivers a continuous and linear fan-control voltage that is
proportional to temperature. |
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Circuit generates Fan speed Control - 03/21/02 EDN-Design Ideas: Fan noise is
becoming a significant issue as electronic equipment increasingly enters the office
and the home. Noise is proportional to fan speed, and the airflow hence, fan speed
necessary for cooling is less at low ambient temperatures. Because ambient temperature
is lower than the upper design point most of the time, a fan can run
slower,.....(design idea added 1/05) |
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Circuit Measures Small Current in DC Servo Motor - 12/07/01 EDN-Design Ideas: The
simple circuit design in Figure 1 lets you measure all components of a current flowing
in a dc servo motor. The rectified output of the circuit uses ground as a reference,
so you can measure the output by using a single-ended A/D converter. The current-sense
resistor, R1, has a value of 0.1Ω.... / (circuit design added 11/06) |
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Circuit protects system from overheating - 11/08/01 EDN-Design Ideas: The two-chip
circuit in Figure 1 provides fan control and overtemperature warning and shutdown
signals to protect systems from excessive heat. The circuit monitors the temperature
of the pc board and the die temperature of a CPU, an FPGA, or another IC with an
on-chip temperature-sensing transistor.....(design idea added 1/05) |
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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 uses everyday components whose tolerances and ratings
are unimportant as long as they sustain the required voltage, current, and
power.....(design idea added 1/05) |
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Circuit provides Class D Motor Control - 05/01/03 EDN-Design Ideas: Class D audio
amplifiers provide a dual benefit for battery-powered portable devices. They enhance
battery life, and they produce much less power dissipation than do their linear
cousins. Those features make Class D amplifiers ideal candidates for controlling speed
and direction in small electric motors.....(design idea added 1/05) |
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Circuit Provides Efficient Fan Speed Control - 03/04/04 EDN-Design Ideas: 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 added 1/05) |
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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....
(electronic circuit added 2/07) |
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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) |
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Combination-Controlled fully customizable RF remote Control - (circuit added 1/07) |
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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) |
Computer Fan speed tacho out circuit: 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. (added 2/05) |
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Constant Brightness LED Stroboscope: 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.... (added 2/05) |
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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) |
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Consumer STB/DVD - (application / block diagram added 6/07) |
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Control 120VAC relay with TTL - ASCII format (electronic design added 02/03/04) |
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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) |
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Controlling 3-Phase AC Induction Motors using the PIC18F4431 - Microchip
Application Note Published 29-Jun-04 (app note added 2/06) |
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Current loop interface - (diagram added 2/07) |
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Current Sense IC Prevents OverCurrent Damage - 04/25/96 EDN-Design Ideas: (design
idea added 6/06) |
