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1 Watt Universal RF Amplifier
Posted on Friday, April 23, 2010   •   Category: FM Transmitters


This is a universal 1 Watt RF class C amplifier that is ideally suited for low power FM transmitters. Input should be at least 100mW to achieve 1W output. It is recommended to enclose the amplifier in a metal case.


LED Bargraph Optical Tachometer
Posted on Thursday, April 22, 2010   •   Category: LED


For the electric R/C enthusiast, a tachometer can be a very useful piece of equipment. When I first built this tach back in 1995, it was essential, as there were very few off-the-shelf electric R/C power systems that just worked. At that time, you had to experiment with batteries, speed controls or switches, connectors, and wiring, and a tachometer was a tool to help you measure the results.


Intelligent NiCd/NiMH Battery Charger
Posted on Thursday, April 22, 2010   •   Category: Battery Chargers


This cheap and easy to build NiCd/NiMH Battery Charger is suitable for automatically charging a wide range of batteries for many applications. Proper chargers are usually expensive and cheap chargers supplied with the original equipment often incorrectly charge the cells and dramatically shorten their life.


2W RF Amplifier For 24/23 CM
Posted on Thursday, April 22, 2010   •   Category: FM Transmitters


This page describes TX ATV Transmitter for 23 cm with output adjustable from 100 to 250mW.


Lithium Ion / Lithium Polymer USB Battery Charger
Posted on Thursday, April 22, 2010   •   Category: Battery Chargers


This is a MAX1811 based USB charger that can handle both Lithium Ion and Lithium Polymer 3.7V battery. It requires very few external components and provides ability to select between 4.1v and 4.2v battery regulation for different types of LiPo batteries. You can select between either 100mA and 500mA current charging mode and LED provides the status of the charging.


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