For years I used my electric oven. Set on the lowest possible temp. and propped the door open with a boomstick (or about an inch) for ventilation. Placed the food on the racks or on cookie sheets. Worked fine.
Later I bought a dehydrator from WalMart that works well. It's actually too hot. I like then results from the oven better. Cost was about $30.
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paul, texas KD5IVP