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Op Amp ~ Build an Electronic Combination Lock Popular Electronics ~ August 1971, Vol. 35, No. 3, 6.5" x 9.2", perfect bound, 116 pages. Very fine condition, binding tight, bright colors, no tears, address label lower right. Popular Electronics is a hobbyist magazine published in 1971 by Ziff-Davis Publishing Co. It had 106 pages of articles, departments, test reports, and ads for everything from correspondence courses to test gear, hi-fi equipment, and TV set kits. It had one of the fist articles on SSB (Single Sideband) for CB Radio. Also a great description of the Op Amp and how it works. And a piece on how to build an electronic combination lock with a million combinations. BTW, I am David Ahl, and I am finally sorting out and selling my vintage computers, books, and magazines. Many of you know me as the founder, publisher, and editor of Creative Computing, the FIRST personal computing magazine in November 1974. Make an offer! What do you have to lose? For shipping, I will ship the issue with stiffener via USPS Media Mail for only $3.49 to any address in the USA. I'm not like some Internet sellers who build big profits into shipping and screw the buyer. Who am I? My web identity is SwapMeetDave, but I'm actually David Ahl, founder of Creative Computing, ex-editor of Military Vehicles, writer, incurable collector, and Christian. When you have time, take a look at my on-line carnival and flea market at SwapMeetDave.com, which is chock full of new clean jokes, patriotic pics, books, magazines, my bio, handyman humor, and other good stuff.  
I accept payments by check or PayPal. I ship the day I receive your payment or notification of payment from PayPal. Thank you!
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