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The EL2257CN is a specialist high speed clamping op-amp featuring a very high slew rate of 275V/us
28V to 175MHz
Also available on a heatsink here
The MRF174 is an RF mosfet rated at 125W up to 200MHz at 28V
With an output of 300-350W with an input drive of only 2W
300W FM Broadcast Reference Design using the BLF278 new The EL2257CN is a specialistNOT FOR SALE IN THE UK The FM300v2 is a broadband 300W amplifier for the FM broadcast band. We've recently managed to source a quantity of used BLF278 transistors at a great price, so have provided a reference design so that a low cost, high performance amplifier can be constructed from the plans provided here. This design is available as a paid download. Files will be available once a purchase is made. Features Broadband 300W FM broadcast amplifier