Popular Electronics March 1970

Popular Electronics, March 1970, Build the Supertrol
Copyright 1970 Poptronix, Inc.; used by permission.

Build Security 1
By J.Pina

Build the No-Bounce Pushbutton
By Don Lancaster

One-Step Motion Detector
By Daniel Meyer

Numitron Readout
By Vincent Wood

Each page is a 150 dpi jpg image.
300 dpi tiff files are available.

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Popular Electronics Issues
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This page was last edited August 20, 2005