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 any electronic devices. The schematic and parts list are designed for a power supply input of 240VAC. Change the ratings of the components if 110V AC power supply input is required. Read more »
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. Read more »
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 time, a lower voltage is applied to finish off and keep from over charging. When the battery is fully charged, the circuit switches off and lights a LED, telling you that the cycle has finished. Read more »
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. When this FM transmitter used in the car, there is no need for a separate input to the car stereo to play back the music files from your MP3 player. Read more »
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. Read more »
Radio-Locator Sticker
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 States. Read more »
Main Windows
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 images can be merged with scanned maps, satellite photos and Mapquest maps to produce accurate prediction plots. You can obtain your copy of Radio Mobile from the official website. Read more »
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