RF Cafe Software
About RF Cafe
1996 - 2016
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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...
All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.
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April 1967 Electronics WorldTable of Contents
People old and young enjoy waxing nostalgic about and learning some of the history of early electronics. Electronics World was published from May 1959 through December 1971. See all Electronics World articles.
Even in the age of computers and smartphone applets for everything, some people still are not comfortable with mathematics, even something as relatively simple as Ohm's Law. There are still a lot of electronics tinkerers around who grew up in the pencil and paper era, where slide rules ruled the day. Those same folks broke out in a rash at the very sight of one of those devices ;-)
So, for those who still appreciate a good resistor selection nomograph, here is one from the April 1967 edition of Electronics World.
Here's a challenge for you recent college grads that are scoffing at the guys who are right now having a grandkid print out a copy of the nomograph for them: What is the resistor color code number associated with the color of the nomograph?
Resistor-Selection NomogramBy Sylvester Salva
Following are two examples illustrating the use of the nomogram.
Nomographs Available on RF Cafe:
- Voltage and Power Level Nomograph
- Voltage, Current, Resistance, and Power Nomograph
- Resistor Selection Nomogram
- Resistance and Capacitance
- Capacitance Nomograph
- Earth Curvature Nomograph
- Coil Design Nomograph
- Coil Inductance Nomograph
- Antenna Gain Nomograph
- Resistance and Reactance Nomograph
Posted March 18, 2012