Following inspiration from Brambles thread about her new dehydrator, heres a link to a homebuild unit -
http://www.backwoodshome.com/build-this ... ehydrator/
...its a bit large but could be scaled and some of the parts are US thingies not widely available here, but they can be substituted. For instance, for heating the plan calls for an Edison Screw (ES) bulb fitting heater coil : a lamp for an egg incubator would do, or an infra red bulb or even one of those small, tube encased, frostwatcher heaters that are used in greenhouses.
An humidistat could be included to supplement the thermostat, or even a cheap, shower extractor fan with a built in humidistat could be used covering two jobs in one.
heres a couple more ;
http://www.motherearthnews.com/diy/buil ... az93fmztak
https://www.instructables.com/id/Inexpe ... /?ALLSTEPS
https://www.instructables.com/id/Box-fo ... /?ALLSTEPS
DEHYDRATOR- home build plans
DEHYDRATOR- home build plans
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