Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes Calculators Education Engineering Magazine Articles Engineering software RF Cafe Archives RF Cascade Workbook 2018 RF Symbols for Visio - Word Advertising Magazine Sponsor RF Cafe RF Electronics Symbols for Visio RF Electronics Symbols for Office Word RF Electronics Stencils for Visio Sponsor Links Saturday Evening Post NEETS EW Radar Handbook Microwave Museum About RF Cafe Aegis Power Systems Anritsu Alliance Test Equipment Amplifier Solutions Anatech Electronics Axiom Test Equipment Berkeley Nucleonics Centric RF Conduct RF Copper Mountain Technologies Empower RF everything RF Exodus Advanced Communications Innovative Power Products ISOTEC KR Filters Lotus Systems PCB Directory Rigol San Francisco Circuits Reactel RFCT TotalTemp Technologies Triad RF Systems Windfreak Technologies Withwave LadyBug Technologies Wireless Telecom Group Sponsorship Rates RF Cafe Software Resources Vintage Magazines Thank you for visiting RF Cafe!

RC Time-Constant Nomogram
July 1965 Electronics World

July 1965 Electronics World

July 1965 Electronics World Cover - RF Cafe  Table of Contents

Wax nostalgic about and learn from the history of early electronics. See articles from Electronics World, published May 1959 - December 1971. All copyrights hereby acknowledged.

After learning Ohm's law, Kirchhoff's law, Norton's theorem, and a few mesh analysis techniques for resistive circuits, electronics students' first foray into the interactions of resistors, capacitors, and inductors is usually time constants. The so-named "RC time constant" is simply multiplication of the values of resistance (ohms) and capacitance (farads) - connected in series - resulting in a time value in seconds. There is nothing special about the time constant other than various rules of thumb which have been designed around it. For instance, 5 RC time constants is considered the time after which a fully discharged capacitor is charged (up to 93.3%, actually), or conversely the time after which a fully charge capacitor is discharged (down to 6.7%). It does so happen that after 1 RC time constant the charge has changed by a factor of 1-e-1 (1-0.368=63.2%). After 5 RC time constants the charge has changed by 1-e-5 = 99.3%. 6 RC time constants yields 99.8%, 7 is 99.9%. 9 RC times constants results in 99.99%. Although not mentioned here, there also the "RL time constant" for series resistor and inductor configurations, where T = L/R.

RC Time-Constant Nomogram

RC Time-Constant Nomogram, July 1965 Electronics World - RF CafeBy Max H. Applebaum / Warwick Electronics Inc., Pacific Mercury Div.

Chart permits quick method of finding combinations of resistance and capacitance to produce the required time-constant combination.

The purpose of this nomogram is to simplify the calculations of RC time constants. Although the operation is fairly simple it can become cumbersome with powers of 10.

More useful, however, is the ability - with this nomogram - to find combinations of Rand C which will give the desired time constant. Various scales are given so that wide ranges of T, R, and C can be found without any calculations. The various possible scale combinations are shown on the nomogram.

Example: Find the time constant of an RC network which has a 1.5-megohm resistor and a 40-pf. capacitor.

Solution: Using the AEG scale combination, draw a straight line from 1.5 on the A scale to 40 on the G scale. The answer, 60 microseconds, is found on the E scale where the drawn line crosses the time scale.

 

 

Posted August 25, 2022

Nomographs / Nomograms Available on RF Cafe:

- Parallel Series Resistance Calculator

- Transformer Turns Ratio Nomogram

- Symmetrical T and H Attenuator Nomograph

- Amplifier Gain Nomograph

- Decibel Nomograph

- Voltage and Power Level Nomograph

- Nomograph Construction

- Nomogram Construction for Charts with Complicating Factors or Constants

- Link Coupling Nomogram

- Multi-Layer Coil Nomograph

- Delay Line Nomogram

- Voltage, Current, Resistance, and Power Nomograph

- Resistor Selection Nomogram

- Resistance and Capacitance Nomograph

- Capacitance Nomograph

- Earth Curvature Nomograph

- Coil Winding Nomogram

- RC Time-Constant Nomogram

- Coil Design Nomograph

- Voltage, Power, and Decibel Nomograph

- Coil Inductance Nomograph

- Antenna Gain Nomograph

- Resistance and Reactance Nomograph

- Frequency / Reactance Nomograph

Anritsu Test Equipment - RF Cafe
ConductRF Phased Matched RF Cables - RF Cafe
RF Cascade Workbook 2018 by RF Cafe
Boonton
withwave microwave devices - RF Cafe

Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

These Are Available for Free

 

About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

Webmaster:

    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:

AirplanesAndRockets.com