Skip to Content

Reviewer notes

Use this space to describe your geocache location, container, and how it's hidden to your reviewer. If you've made changes, tell the reviewer what changes you made. The more they know, the easier it is for them to publish your geocache. This note will not be visible to the public when your geocache is published.

Mystery Cache

Digital Electronics : Theory

A cache by mjouk Send Message to Owner Message this owner
Hidden : 11/8/2012
Difficulty:
3 out of 5
Terrain:
2 out of 5

Size: Size: regular (regular)

Join now to view geocache location details. It's free!

Watch

How Geocaching Works

Please note Use of geocaching.com services is subject to the terms and conditions in our disclaimer.

Geocache Description:

We're all used to using the digital electronics in our GPS receivers to find caches, but to solve this puzzle you'll have to work out how a simple digital circuit works.


Caveat cacher

The coordinates above point to the middle of a field. There is nothing to see there.

FTF

Congratulations to TelemachusGB for being FTF.

Digital Electronics : Theory

The diagrams below show arrangements of logic gates, flip-flops, and seven-segment displays.

To find out where the cache is hidden, you simply have to work out what you'd see on the displays were you to build the circuits.

The circuits are quite simple, so pencil and paper are probably the best tools for the task, though you could actually build them! If you do stick to pencils, then the worksheet below might help:

You can check your working at geocheck:

If you've enjoyed this cache, you might enjoy its companion Digital Electronics : Practical. If you are planning to do that one, please borrow a kit of components from this cache when you sign the logbook.

Additional Hints (Decrypt)

Ba gur yrsg-unaq fvqr bs gur pvephvg qvntenzf gurer ner fbzr grfg cbvagf. Lbh zvtug fgneg ol jbexvat bhg jung'f unccravat gurer.

Gurer ner urycshy svaqvat uvagf ba Trbpurpxre.

Decryption Key

A|B|C|D|E|F|G|H|I|J|K|L|M
-------------------------
N|O|P|Q|R|S|T|U|V|W|X|Y|Z

(letter above equals below, and vice versa)



 

Find...

76 Logged Visits

Found it 52     Write note 22     Publish Listing 1     Owner Maintenance 1     

View Logbook | View the Image Gallery of 2 images

**Warning! Spoilers may be included in the descriptions or links.

Current Time:
Last Updated: on 11/15/2017 3:54:26 PM (UTC-08:00) Pacific Time (US & Canada) (11:54 PM GMT)
Rendered From:Unknown
Coordinates are in the WGS84 datum

Return to the Top of the Page