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Innovative Power Products (IPP) 90 deg Hybrid Couplers - RF Cafe

What's Your EQ?
December 1966 Radio-Electronics

December 1966 Radio-Electronics

December 1966 Radio-Electronics Cover - RF Cafe[Table of Contents]

Wax nostalgic about and learn from the history of early electronics. See articles from Radio-Electronics, published 1930-1988. All copyrights hereby acknowledged.
"What's Your EQ?, December 1966 Radio-Electronics - RF Cafe

Conducted by E. D. Clark

Two puzzlers for the student, theoretician and practical man. Simple? Double-check your answers before you say you've solved them. If you have an interesting or unusual puzzle (with an answer) send it to us. We will pay $10 for each one accepted. We're especially interested in service stinkers or engineering stumpers on actual electronic equipment. We get so many letters we can't answer individual ones, but we'll print the more interesting solutions - ones the original authors never thought of.

Write EQ Editor, Radio-Electronics, 154 West 14th Street, New York, N. Y. 10011.

Answers to this month's puzzles are on page 95.

Black Box

In this circuit, the neon lamp glows momentarily each time the spring-return switch is depressed. What's the circuit inside the box? -John H. Gibson

Switching Circuit

Switches A, Band C (one spdt, two dpdt) control lights at their respective locations, so that one, but only one, is always lighted. Switch A turns light off at A and on at B; switch B turns off light at B and on. at C, and so on.

How are the switches wired? -Albert S. Lombard

Quizzes from vintage electronics magazines such as Popular Electronics, Electronics-World, QST, Radio-Electronics, and Radio News were published over the years - some really simple and others not so simple. Robert P. Balin created most of the quizzes for Popular Electronics. This is a listing of all I have posted thus far.

RF Cafe Quizzes

Vintage Electronics Magazine Quizzes

Vintage Electronics Magazine Quizzes

Answers to What's Your Eq?

Puzzles are on page 52.

Black Box

The 45-volt battery alone won't cause the neon lamp to fire. With S open, the capacitor charges to 45 volts through the two 470K resistors. When S is closed, the capacitor is in series with the battery, and the 90-volt sum appears across the NE-2, which fires.

Switching Circuit

Switches are wired as shown.

 
Innovative Power Products (IPP) 90 deg Hybrid Couplers - RF Cafe

About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2025
Webmaster: Kirt Blattenberger,
   BSEE - KB3UON - AMA92498
   USAF Radar Technician

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 lady's voice announced "You've Got Mail" when a new message arrived...

Copyright  1996 - 2026

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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