| Sure, that 50-cents non-returnable AC power adapter you found in the Unlabeled/NoWarranty/NoNothing bin the local thrift shop is a bargain a...
| Sure, that 50-cents non-returnable AC power adapter you found in the Unlabeled/NoWarranty/NoNothing bin the local thrift shop is a bargain a...
| Using photovoltaic (PV panels (”solar panels”) is an attractive way to keep batteries charged in boats and recreational vehicles. While RVs...
| Many audiophiles have occasionally thought about building a tube amplifier, but they are deterred by the high cost, large enclosure, hefty t...
| Here’s the problem—two grandchildren each with a remote controlled train set but both IR remote controllers use the same channel! Short of b...
| Good news for all audio enthusiasts: we are proud to present yet another all-analog circuit developed entirely in house. Despite the simple...
| Most amateur radio transmitters are not actually designed for transmitting wideband audio signals with high fidelity. However, the wideband...
| The goal of this project is to allow standard AA size rechargeable batteries, like NiMH, to effectively charge portable devices like smartph...
| This night light has two power sources: a solar cell with a peak output voltage of about 6 V, and a Li-Ion cell with a voltage between 3.7 V...
| Practically the first thing you are taught about LEDs is that they need a constant current power source. Power LEDs are no different they ju...
| Thirteen years into the new millennium, people no longer take printed maps on cycling trips. A smartphone suffices! However, with power for...