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<DIV>Check out UDN2987 as a substitute, 20 pin and 350 ma current. $3.30 at
digi-key.</DIV>
<DIV> </DIV>
<DIV>Joe</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 3/3/2011 9:43:11 P.M. Eastern Standard Time,
phil@pharman.org writes:</DIV>
<BLOCKQUOTE style="PADDING-LEFT: 10px; MARGIN-LEFT: 10px"><FONT style="BACKGROUND-COLOR: transparent" face=Arial color=#000000 size=2>*****
High Performance Software Defined Radio Discussion List *****<BR><BR>Hi
Tom,<BR><BR>Yes, that would work OK. Add a resistor between the base of the
2N2907 and<BR>the 9v rail to make sure the transistor turns off when the Penny
OC is<BR>off.<BR><BR>Also check there are diodes across each of the relay
coils.<BR><BR>73 Phil...VK6APH<BR><BR><BR>> ***** High Performance Software
Defined Radio Discussion List *****<BR>><BR>> Thanks for the info, Joe
and Phil.<BR>><BR>> Yes, I need 9V high switched to the relays at 100 ma
per band. The relays<BR>> are grounded on the board. I
see the connections coming off the Penny<BR>> 25<BR>> pin connector on
the schematic. Also see the software toggles required.<BR>>
Good.<BR>><BR>> That circuit looks good, Joe. Though after a quick look,
the M54581 chip<BR>> is<BR>> $20 and only available from the
UK.<BR>><BR>> I was thinking an easier way might be to use a small
2N2907 PNP transistor<BR>> which gets its base grounded from Penny, the
collector to 9V and the<BR>> emitter<BR>> in series with the LP
relay. I would need one transistor per band, or<BR>> about<BR>>
seven transistors total. Not too bad.<BR>><BR>> Does this sound like it
would work OK?<BR>><BR>><BR>> Tom,
K1JJ<BR>><BR>><BR>> _____<BR>><BR>> From:
K1rqg@aol.com [mailto:K1rqg@aol.com]<BR>> Sent: Thursday, March 03, 2011
8:35 PM<BR>> To: k1jj@comcast.net; hpsdr@lists.openhpsdr.org<BR>>
Subject: Re: [hpsdr] Control an FT-1000D Low Pass Filter assembly with<BR>>
PSDR<BR>> mouse?<BR>><BR>><BR>> Tom<BR>><BR>> This circuit
should fill the bill. Thanks to WW2R for this design.<BR>><BR>>
http://g4fre.com/hpsdr_high_side.pdf<BR>><BR>> Just apply 9 v instead of
12 v! It drives my Yaesu FT-747 brick and<BR>> filters.<BR>><BR>> 73
de Joe K1RQG<BR>><BR>><BR>> In a message dated 3/3/2011 8:15:11 P.M.
Eastern Standard Time,<BR>> k1jj@comcast.net writes:<BR>><BR>> *****
High Performance Software Defined Radio Discussion List
*****<BR>><BR>><BR>><BR>><BR>> My plans call for using an old
Yaesu FT-1000D 200W PA unit with relay<BR>> switched LP Filters as my
linear amplifier for Penny.<BR>><BR>> I would like to switch bands on
this low pass filter assembly using the<BR>> mouse PSDR software band
selections along with the Penny/Mercury band<BR>>
selections.<BR>><BR>> Could someone advise me on the best approach to
switch the 9 volt LP<BR>> filter<BR>> relays, 160, 75, 40, 20, 15 and
10M using the existing output interface?<BR>> Or do I need to build
an interface?<BR>><BR>> The simple alternative is to just use a
rotary band switch and switch the<BR>> L.P filter manually. I want to
explore using the mouse auto-method first.<BR>><BR>>
Thanks.<BR>><BR>> Tom, K1JJ<BR>><BR>><BR>>
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