Design Ideas: July 21, 1994

Feedback and Amplification

Corrections

In Design Idea #1426, "Ring oscillator measures cable length," (EDN, May 12, 1994, pg 90), a 100m cable yields a 1-MHz oscillation frequency, not 600 MHz as stated in the text. EDN regrets that the names of the Design Idea's coauthors, S Paasch and K Mentzer, were inadvertently omitted.

In addition, the circuit diagram for Design Idea #1417, "Comparator improves regulator's efficiency" by Christophe Basso (EDN, April 28, 1994, pg 72), contains an extra connection dot. Delete the connection dot that joins the trace from C₂ to R₁ with the trace that runs from IC₁'s RT/CT pin to the 22-nF capacitor.

In "Monitor follows PC's power-on self-test," by Jerzy Chrzaszcz, (EDN September 16, 1993, pg 124,) the signal labeled LOW should be IOW.

In "Comparator improves regulator's efficiency," by Cristophe Basso, EDN April 28, 1994, an erroneous connection dot joins the trace running between IC₁'s RT/CT pin and the 22-nF capacitor with the trace running from R₂ to C₂.