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LM338 Power Supply
5A Adjustable Voltage Power Supply using LM338
Here’s a variable voltage power supply circuit using a LM338 adjustable 3 terminal regulator to supply a current of up to 5A over a variable output voltage of 2V to 25V DC. It will come in handy to power up many electronic circuits when you are assembling or building [...]
Audio Spectrum Analyzer
Mini Audio Spectrum Analyzer LM3915
The circuit has been designed to create a spectrum analyzer that will provide an analysis of a sound to determine at various frequencies, the volume of sounds that make up the overall sound spectrum.
Auto Battery Charger
Auto Battery Charger 12V
This auto battery charger uses no transformer, rectifier, or filter capacitors on the schematic. No reason why you cannot add these. This charger will quickly and easily charge most any lead acid battery. The charger delivers full current until the current drawn by the battery falls to 150 mA. At this [...]
Wireless FM Transmitter
USB Powered Wireless FM Transmitter Circuit
Here’s a Wireless FM transmitter circuit powered from USB ports that could be used to play audio files on a standard VHF FM radio. The transmitter circuit use no coils that have to be wound. This FM transmitter can be used to listen to your own music throughout your home. [...]
FM Receiver
One Transistor FM Radio Receiver Circuit
Here’s simple FM receiver circuit for a simple superregenerative FM radio. It is sensitive, selective, and has enough audio drive for an earphone. These designs generally have low component counts, however the design or my construction have been far from simple.
Radio Station FM
How to Search World Radio Station FM Online-Radio Locator
This website is a search engine for finding radio stations FM or AM in the United States and all around the world. Radio-Locator uses a unique search engine to find all the radio stations that can be heard at a specific geographic location in the United [...]
Radio Mobile
Radio Mobile RF Propagation Stimulation
Radio Mobile is a free and powerful tool for plotting RF patterns and predicting the performance of radio systems. Using freely available terrain elevation data it can produce grey scale, x-ray and rainbow colored virtual maps. One can also produce 3-D and stereoscopic views as well as flyby animations. Background [...]
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