Category: high-powered vacuum tubes

Battery Chargers

If you use a lot of batteries, you can drastically cut back on battery costs by using rechargeable batteries in conjunction with a solar charger. And I’m not only talk­ing about the standard household batteries, either. You can get solar chargers for vehicle batteries, notebook computer batteries, and small appliances. Using these devices gives you […]

Sun Tea

Here’s the cheapest project you can possibly do with the sun. Put some tea bags and water in a big glass jar with a lid, and leave it in the sunshine for a few hours. By the middle of the afternoon, you’ll have refreshing sun tea. You don’t need to heat water on the stove […]