Good show, Frank.
The GFZ MOSFET audio driver will make a BIG difference and BIG bang for the buck in any BIG plate modulated AM transmitter. That's BIG news! Get rid of the tube drivers, backwards audio transformers, interstage transformers, etc. Not only is it very heat-efficient and has little phase shift, but is small with just one supply required. Excellent performance with negative feedback built in - and easy to build, esp with a PC board.
Considering how much time and effort is needed to put a big plate modulated rig on the air, $100 for a custom board like this is a bargain in comparison. No way to duplicate it for less once time and actual cash outlay is figured in for a small run of boards.
One volt of audio in = audio drive and fixed bias to the modulator grids, with a negative feedback loop back to the input..
If this board gets put to widespread use, it could revolutionize audio driver technology in the AM community. We might even be able to take over the whirl!...
Disclaimer: Mr Vu has no financial involvement in Mr Carcia's proposed PC board project - your mileage may vary - the individuals portrayed here are actors - offer expires Dec 31, 2011
T
Well put, Thomas!
I have given my committment to Frank to purchase two of these FET audio driver boards.
$100.00 each is a
very reasonable price to pay for an item such as this, when you consider all of the non-recurring engineering Frank has to go through to bring this board to market, such as the board layout, creation of the artwork so the board can be professionally fabricated, schematic capture, etc., and Frank is completely entitled to recover these costs in their entirety. And because the quantity of the build is limited, the recurring cost is naturally significant. I know this from having sheetmetal parts fabricated for my various radio creations and restorations, as well as from my professional experience.
Come on guys, step up to the plate and give a committment to Frank today for your driver board. Be the first one on your block to take advantage of the technical benefits this circuit will provide in virtually any high-power plate modulated transmitter!
Don't delay, as quantities are limited. And if you place your order within the next ten minutes, we'll also include free with your order........
This offer is void where prohibited.
And I too have no business affiliation with Frank in this endeavor. I am only providing my encouragement to him.
73,
Bruce