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AN779L----------Call for leadtime

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Product Description


The AN779L driver amplifier provides a power output of 20 watts with a total power gain of 25 dB and the construction technique allows the use of inexpensive components throughout. The plastic RF power transistors, MRF475 and MRF476, featured in this amplifier, were initially developed for the CB market. The TO-220 packaged parts are ideal for applications up to 50 MHz, where low cost is an important factor. The MRF476 is specified as a 3-watt device and the MRF475 has an output power of 12 watts. Both are extremely tolerant to overdrive and load mismatches, even under CW conditions. Typical IMD numbers are better then -35 dB, and power gains are 18 dB and 12 dB, respectively, at 30 MHz. This amplifier was designed to serve as a 1.6 to 30 MHz broadband driver.


Frequency Range    1.6 to 30 MHz

RF Power Gain        25 dB (typical)

RF Power Input       100 Milliwatts

RF Power Output     20 Watts

DC Input Voltage     12.5 Volts

DC Input Current     5 amps (typical)

The component set includes:

1 ea.  Capacitor Set               

1 ea.   Resistor Set 

1 ea.   Semiconductor Set     

1 ea.   Ferrite Set

1 ea.   Transformer Set          

1 ea.   Miscellaneous Hardware Set

1 ea.   Printed Circuit Board


AN779 Application Note

AN779L Construction Hints

MRF475 Data Sheet

MRF476 Data Sheet

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