Popular Electronics May 1968

Copyright © 1968 Poptronix, Inc.; used by permission.

Build the Sonolite.
Build the M/M/M Instrument Amplifier (Part 2)
Daniel Meyer
SWTPC

Cyclops Intruder Detector
John S. Simonton Jr.
PAIA Electronics
(This was the first project published by PAIA Electronics. They were more successful with their music synthesizer projects.)

Flame Amplification
James Joseph

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300 dpi tiff files are available.