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2W RF Amplifier For 24/23 CM
Posted on Thursday, May 6, 2010   •   Category: FM Transmitters


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


RS232 Serial to USB Converter
Posted on Thursday, May 6, 2010   •   Category: USB Circuts


This is simple RS232 Serial to USB Converter that doesn’t need any further explanations. You can use it for any projects that might need it. Diagrams for USB and DB-9 female connectors are provided.


Wireless Temperature and Humidity Sensor with USB
Posted on Thursday, May 6, 2010   •   Category: AVR


This project is based on obdev's RemoteSensor example and their firmware-only USB implementation; the main change is the replacement of the analog sensors with a Sensirion SHT11 digital temperature and humidity sensor.


Half-Wave Dipole Antenna (Open Dipole)
Posted on Thursday, May 6, 2010   •   Category: Antennas


It accepts load from 75 ohm source and has much smaller power output than Ground Pole Antenna. Use this antenna only when you don't have GP Antenna. Construction: Two aluminum rods ,each of length "L" in meters are joined together through an insulator as shown in fig. From center, 75 ohm cable is feeded just like ordinary TV antenna.


NiCd Charger with Thermal Peak Detection
Posted on Sunday, May 2, 2010   •   Category: Battery Chargers


The electric model aircraft and car industries have produced a bewildering array of field chargers for NiCd motor battery packs. These range from simple 6 or 7 cell chargers consisting of a resistor and mechanical timer, to more complex chargers with peak detection, cycling, and the ability to handle 36 cell packs.


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