Hi Jay,
Try a FET driver.
A typical device may be seen here:
http://focus.ti.com/docs/prod/folders/print/ucc37321.html
73 & Good morning,
Marv WC6W
http://wc6w.50webs.com/
--- On Sun, 5/23/10, JayKay <pcb4u@verizon.net> wrote:
> From: JayKay <pcb4u@verizon.net>
> Subject: [Amps] Relay Driver (Chip)
> To: Amps@contesting.com
> Date: Sunday, May 23, 2010, 2:07 PM
> Folks
>
> I am using the W9XT band decoder board to interface to a
> Yaesu radio for a local ham friend. All going well until I
> found out the switching box he ordered is an Array Solutions
> 6 pack.
>
> 1) The output of the W9XT board is a 0 for the active band
> and open (open collector) for all the remaining outputs.
> Thus the relays in the antenna switching box would need to
> have a 12V bus and switch the low side of the required relay
> via the W9XT board.
>
> 2) The Array Box 6 Pack looks like all the relays are
> grounded and 12V is required to switch the band needed
>
> Besides the obvious transistor inversion that would be
> required for each band output from the W9XT board, does
> anyone know a chip that can handle a 0 output (ground, as an
> input) and supply 12V output at about 400-500 ma and output
> no voltage when the input sees an open (or can be pulled
> up)?
>
> Jay
> W2IJ
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