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Driver
Circuits, Page 7a
Drivers: #'s
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Last Updated on:
Wednesday, November 29, 2017 05:38 AM |
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Circuits Designed by Dave Johnson, P.E. : |
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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,....
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Ramping Lamp Driver 2
This circuit drives any 12v lamp, incandescent or LED type, in a ramping fashion.
Each press of the button toggles the lamp from a fully off mode to a fully on mode.
But, instead of an instantaneous lamp intensity change, the power is slowly ramped
up and down. With the components shown, the ramping action takes two seconds
to complete. By changing the capacitor C3, you can increase or decrease the
ramping time. The circuit will also operate with supply voltages ranging from
15v to 3v.
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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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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Powerlabs Flyback Driver - (electronic circuit added 1/05) |
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Power-supply IC drives multiple LEDs - 2-Sep-04 Issue of EDN 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 in constant-current mode can
better match the luminance between the devices without needing to match LEDs for their
forward-voltage drop..... [Design Idea by John Lo Giudice and Vee Shing Wong,
STMicroelectronics, Schaumburg, IL] |
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Processor's PWM output controls LCD/LED driver - 27-May-04 Issue of EDN
The PWM (pulse-width-modulation] output available from many microprocessors is based on an
internal 8- or 16-bit counter and features a programmable duty cycle. It is suitable for
adjusting the output of an LCD driver (Figure 1], a negative-voltage LCD driver (Figure
2], or a current-controlled LED driver (Figure 3]..... [Design Idea by Joe Neubauer, Maxim
Integrated Products, Sunnyvale, CA] |
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Pulsed laser driver - Schematic only, no circuit description |
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Pulsing Charge Pump Drives Capacitive Loads - 11/05/98 EDN-Design Ideas.....The
test circuit in Figure 1 efficiently drives various capacitive loads, such as memory
cells and simple capacitors, so that you can observe their leakage effects. Essentially,
the circuit is a pulsed and variable current source acting as a charge pump. A pulsed
voltage source drives a one-shot oscillator.….Several circuits here, scroll to find this
one..... [Design Idea by Paul J Rose, Mental Automation Inc, Bellevue, WA] |
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Push-Pull Complementary Power MOSFET Driver - Circuit Ideas for Designers
Application Notes Advanced Linear Devices, Inc.....[App Note] |
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PWM controller drives LEDs from High-Voltage lines - 4-Mar-04 Issue of EDN
Powering LEDs from a wide dc range—say, 30 to 380V—without wasting a lot of power in the
regulating block, is a difficult task when the LED current needs to be constant. Dedicated
LED drivers are available, but they usually implement boost structures and are thus
inadequate for high-voltage inputs..... [Design Idea by Christophe Basso, On
Semiconductor, Toulouse, France] |
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PWM White LED Drivers - (electronic circuit added 4/05) |
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Rainbow LED indicates voltage with color - 7-Dec-04 Issue of EDN Meters
that indicate analog levels via a moving-pointer meter, a numeric display, or a column of
LEDs typically occupy considerable panel area and requirethan 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 by David Prutchi, Impulse Dynamics,
Haifa, Israel] |
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Ramping Lamp Driver - This circuit drives any 12v lamp, incandescent or LED
type, in a ramping fashion. Each press of the button toggles the lamp from a fully
off mode to a fully on mode. But, instead of an instantaneous lamp intensity change,
the power is slowly ramped up and down. With the components shown, the ramping
action takes two seconds to complete. By changing the capacitor C3, you can increase
or decrease the ramping time. The circuit will also operate with supply voltages
ranging from 15v to 3v. [Hobby circuit designed by Dave Johnson] |
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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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