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Servo Pulse to PWM - converter connects an H-Bridge to radio control receivers or
robotic circuits. (added 1/05) |
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Simple Circuit Provides Efficient PWM - 02/18/99 EDN-Design Ideas: You often need
to control the duty cycle of a square wave. The circuit in Figure 1 works from a
single 5V supply at a frequency of 100 kHz. With minor component changes, you can
configure it for a range of frequencies. The circuit consists of a ramp (sawtooth)oscillator.....(design
idea added 2/06) |
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Simple DC Motor PWM speed control - ….(electronic schematic added 08/08) |
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Simple nanosecond width pulse generator provides high performance - 11/11/04 EDN-Design
Ideas:.....(design idea added 5/05) |
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Simple PWM ADC is Surprisingly Accurate - 06/09/94 EDN-Design Ideas: The reference
voltage in Fig 1a's simple rail-to-rail PWM ADC is the only critical component. The
input-voltage range extends from ground to the power rail which also acts as the
reference. The circuit is essentially a variation on the classic dual-slope
integrator.....(design idea added 3/03) |
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Single-Sideband Demodulator Covers the HF Band - 10/26/00 EDN-Design Ideas: The
circuit in Figure 1 complements a previous Design Idea ( SSB modulator covers HF band
EDN , Sept 30, 1999, pg 122). The modulator employs a phasing....(design idea added
08/08/08) |
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ST6: UNIVERSAL Motor Control EVALUATION BOARD - The UMC01EVAL Evaluation Board is
designed for a very low-cost phase control system based on the 8-bit ST62T00C
microcontroller. It can be used to control a universal motor powered by a 230 V / 50
Hz mains supply. (app note added 3/05) |
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Stereo Ducker - (electronic circuit added 7/03) |
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Strain Gage Measurement using an AC Excitation - AN-683-Analog Device Application
Notes (app note added 2/06) |
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Subcarrier Adapter - Listen to those hidden FM transmissions (Tony van Roon's
electronic design added 2/06) |
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Synchronous Modulator - This unique circuit uses a very small amount of battery
current and has excellent carrier suppression. Its only shortcoming is that you must
limit the input signal to 0.7 Vp-p in order to prevent distortion. To use higher input
voltages, replace Q3 with a JFET. A MOSFET doesn’t do as well as an NPN transistor.
Designed by Andrew R. Morris (added 6/06) |
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Synchronous Modulator-1 - This is an OpAmp version of the synchronous modulator I
submitted earlier. It has more consistent performance over varying power supply
voltage than the discrete version, but it still has the 0.7 Vp-p limitation on the
maximum input voltage. You should use a JFET or a CMOS switch in place of Q1 if you
need to accommodate a higher input voltage....Designed by Andrew R. Morris (added
6/06) |
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Synchronous System Measures µΩs - AN-306-Analog Device Application Notes (app
note added 2/06) Synchronous Detection Scheme Measures Low Resistances |
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Telephone Transmitter FM - Receive telephone conversations on any FM radio with
this neat little device. (Tony van Roon's schematic added 2/06) |
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Timer with 555 - Some useful circuits using the LM555 IC. Scroll to find the Timer
with 555 circuit (11/06) |
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Transistor Pair Lowers PWM IC's Start up Current - 03/18/99 EDN-Design Ideas: An
auxiliary winding usually provides power for the popular UC384X-based offline
switch-mode power supplies (SMPSs). This winding feeds the main PWM controller during
steady-state operation. However, the controller always needs a small start-up current,
which clearly plagues the efficiency in very.....(design idea added 2/06) |
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TV Modulator - This circuit uses an MC1373 to form a TV video modulator (added
5/02) |
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Two transistor circuit replaces ICI am always impressed with the way semiconductor
manufacturers go out of their way to make the end designer’s job easier. One example
is the LTC4300 recently introduced by Linear Technology. This chip buffers I2C
clock…(design added 10/09) |
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Variable Range PWM A/D for COP820CJ - National Semiconductor Application Note
(app note added 2/06) |
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Variations on the PWM DC Motor Speed Control - (electronic design added 9/02) |
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VHF/UHF TV Modulator - Simple oscillator that generates a frequency in the VHF or
UHF region. The oscillator is modulated with the video signal and the modulated
carrier wave thus generated is fed into the TV set's aerial input via a cable. Then
all that remains to do is tune the TV to the correct frequency....(added 4/02) |
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Video Design Idea: Leverage PWM output & add a low cost DAC to your system -
07/19/07 EDN-Design Ideas: Bonnie Baker, senior applications engineer at Texas
Instruments and regular EDN columnist, demonstrates a simple way to add DAC
functionality to a microcontroller-based system using only an op amp and two passive
components.....(design idea added 9/08) |
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Voltage Controlled Mixer with Modulator - (electronic circuit added 7/03) |
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Waveform Generator Demodulates FM Signals - 10/10/96 EDN-Design Ideas: / The
circuit in Figure 1 uses the phase-detector signals of a precision waveform-generator
IC to perform FM demodulation. In a standard application, the IC's phase-detector
input and output synchronize the chip's output frequency to that of an applied signal.
If the signal is FM,.....(design idea added 2/06) |
