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CD4093 Pulse Width Modulator - The IC used is a CMOS type MC14093,
a quad 2-input NAND Schmitt trigger. If you wish, it can be directly
interchanged with the CMOS MC14011 but this type is noisy..…. [Tony van
Roon's circuit]
Circuit makes simple FSK modulator - 11-Oct-01 Issue of EDN
The need for a compact telemetry system poses a challenge for designing a
small, light, low-component-count system. Interfacing serial data from
the....[Design Idea by Shyam Tiwari, Sensors Technology Ltd, Gwalior, India]
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.....EDN is
migrating links. This link is not verified. Search the "title" + "EDN" for
new link.
Circuit sequences supplies for FPGAs - 23-Jan-03 Issue of EDN System
designers must consider the timing and voltage differences between core and I/O power
supplies (in other words, power-supply sequencing] during power-up and power-down. The
possibility of a latch-up failure or excessive current draw exists when power-supply
sequencing does not occur properly. The trigger for latch-up may occur if power
supplies apply different potentials to the core and....[Design Idea by David Daniels,
Texas Instruments, Dallas, TX]
countdown timer may never need battery replacement - 06/23/05 EDN-Design
Ideas....Processor-based timer draws microamps....EDN is migrating links. This link is
not verified. Google the "title" EDN for new link.
Current mirror improves PWM regulator’s performance - 1-Mar-07 Issue of EDN
Reduce Miller Effect to enhance an SMPS' performance and reduce component
count....[Design Idea by Grant Smith, National Semiconductor, Phoenix, AZ; Edited by
Brad Thompson and Fran Granville]
Digisound ring modulator - Dual Ring Modulator based on MC1496. The X and Y
inputs are AC coupled and are capable of accepting 10V p-p signals. Comprises two
totally independent ring modulators on the same PCB which produces the sum and
difference with two input signals. Ideal for the production of a whole range of sounds
including bell and gong sounds....
