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One component stepper Motor Driver - (circuit / schematic design added 6/06) |
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One microController pin drives two LEDs with low quiescent current - 02/07/08 EDN-Design
Ideas: Two simple circuits allow a battery-powered microcontroller to drive two
LEDs.....(design idea added 09/08) |
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Optical Channel Identification on the ADN284x Laser Drivers - AN-658 Analog
Devices Application Notes (app note added 6/06) |
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Optical feedback extends white LEDs' operating life - 01/18/07 EDN-Design Ideas:
PWM-controller loop stabilizes light output.....(design idea added 05/06/07) |
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Parallel White LED Driver - National Semiconductor Application Note LM3595 August
2003 (app note added 02/05) |
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Photovoltaic Switch disables unused LEDs - 03/18/04 EDN-Design Ideas: In many
applications, it's desirable to disable LEDs used for system verification. Many
options are available for the disabling function, including manual SPST (single-pole
single-throw)switches, enhancementand depletion-mode MOSFETs, bipolar-junction
transistors, and JFETs.....(design idea added 1/05) |
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PIC LCD & Keypad Driver - (circuit / schematic design added 6/06) |
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PIC microprocessor drives 20 LED dot or bar graph display - 09/01/06 EDN-Design
Ideas: Indicator circuit features low cost and minimal component count.....(design
idea added 6/07) |
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PIC18xxx8 can Driver with Prioritized Transmit Buffer - Microchip Application Note
Published 9-Sep-02 (app note added 6/06) |
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Piezoelectric driver finds buzzer’s resonant frequency - 08/07/08 EDN-Design
Ideas: By driving a piezoelectric buzzer near its resonant frequency and counting the
residual oscillations, a microcontroller can find the buzzer's resonant
frequency.....(design idea added 09/08) |
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Pin Diode Drivers - National Semiconductor Application Note 02 Mar1999 / (app
note added 7/02) |
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Power MOSFET Gate Driver Circuits using High Current Super-B Transistors: 6a Pulse
Rated SOT23 Transistors for High Frequency MOSFET Interfacing - Zetec
Semiconductors Applications Notes A description of the MOSFET converter
circuits' requirement for a high current buffer stage, a suggested range of Zetex high
current capable, fast switching transistors, and circuit examples. (app
note added 6/06) |
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Power Supply IC Drives Multiple LEDs - 09/02/04 EDN-Design Ideas: Bright LEDs are
becoming prominent sources of light. They often have better efficiency and reliability
than do conventional light sources. Although LEDs can operate from an energy source as
simple as a battery and a resistor, driving a string of LEDs.....(design idea added
1/05) |
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Powerlabs Flyback Driver - (electronic circuit added 1/05) |
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Processor's PWM output Controls LCD/LED Driver - 05/27/04 EDN-Design Ideas: The
PWM (pulse-width-modulation)output available from many microprocessors is based on an
internal 8or 16-bit counter and features a programmable duty cycle. It is suitable for
adjusting the output of an LCD driver, a negative-voltage LCD driver, or a
current-controlled LED driver. cost alternative that provides not only a 4to 20-mA
output,.....(design idea added 1/05) |
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Push-Pull Complementary Power MOSFET Driver - Circuit Ideas for Designers
Application Notes Advanced Linear Devices, Inc. (app note added 6/06) |
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PWM Controller Drives LEDs from High Voltage Lines - 03/04/04 EDN-Design Ideas:
You can use an ADT7461 single-channel temperature monitor, an ADG708 low-voltage,
low-leakage CMOS 8-to-1 multiplexer, and three standard 2N3906 pnp transistors to
measure the temperatures of three separate remote thermal zones(Figure 1).
Multiplexers have an inherent-resistance on-resistance; the channel matching and
flatness of this resistance normally results in a varying temperature
offset.....(design idea added1/05) |
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PWM White LED Drivers - (electronic circuit added 4/05) |
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Rainbow LED indicates voltage with color - 12/07/04 EDN-Design Ideas: Meters that
indicate analog levels via a moving-pointer meter, a numeric display, or a column of
LEDs typically occupy considerable panel area and require more than a casual glance to
read. An indicator lamp or LED takes little space but indicates only an on or off
condition. However, an unobtrusive LED that changes color as a function of a measured
value would enable an observer to easily asse.....(design idea added 1/05) |
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Ramping LED Driver - The circuit below was designed to drive a LED with an
intensity ramping mode. Two 555 timers generate two different triangle
waveforms. The upper device generates a 10KHz signal while the lower unit
produces a 1Hz signal. The two signals are fed to a voltage comparator.
The result is a pulse width modulation (PWM) signal, which with the aid of the FET,
drives the LED in such a way that its average light output slowly ramps from about
zero light to maximum and then slowly dims back down. The circuit should operate over
a supply voltage ranging from 3v to 12v. You can easily vary the ramping time by
changing the value of the 1M resistor. For an interesting effect, you can place
a 1N4148 diode in parallel with the 1M resistor, with the cathode (banded end) side
connected to pin 3. ….(designed by David A. Johnson) |
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Red LEDs function as light sensors - 03/20/08 EDN-Design Ideas: You can build
simple LED illuminators using the red LED to sense ambient-light level.....(design
idea added 09/08) |
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Reduced Power Relay Driver - Relays can handle a lot of power. However, for
certain power sensitive designs you would like to reduce the power needed to hold a
relay closed. The circuit below performs such a task. It uses a single
CD4093 quad NAND gate. When the “on” logic input signal is detected, the relay
is first pulsed on for about 500ms. This is sufficient time to insure the relay
is fully closed. After that initial pulse the relay is then driven with a square
wave signal, whose duty cycle can be adjusted. The signal duty cycle can be
adjusted from about 10% to 90%. In most cases a 50% duty cycle will hold the
relay closed. This reduces the average DC current required by the same factor,
which means a 4:1 reduction in power. The circuit can operate over a wide 3v to 15v
range. ….(designed by David A. Johnson) |
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Rolled-Off Noise Source - This is a circuit that generates white noise, rolled-off
to drive earphones or a small speaker. White noise creates is a "rushing" sound, which
sounds something like air rushing by your ear(s). White noise would be flat with
frequency,.... (circuit added 6/07) |
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RS232c Line Driver IC Drives Power MOSFETs - 10/24/96 EDN-Design Ideas: Easy to
effect an interface between power MOSFETs and TTL circuits.....(design idea added
6/06) |
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RTTY Terminal unit - This circuit may be connected directly across your rig
speaker terminal and used to drive a teleprinter coil directly. A normal teleprinter
coil requires 80/80 volts to energise the coil, but this is connected in series with a
2.7K resistor to give a sort of constant current. The teleprinter coil never has more
than 20 volts accross it, ....(electronic circuit added 7/03) |
