RE: [perseus_SDR] Re: U.S. Power Supply Replacement?
I purchased the Jameco unit to keep as a spare then saw the mailing on using two usb ports on the laptop. Made up the cable and the Perseus works fine powered from the laptop. ( HP Pavgilion dv7).
Cape May, NJ
Thanks for the info. I found this one on Amazon and ordered it...barrel and tip size look to be the same.
I will check out the Jameco....right now their website seems to be down.
Same failure happened to my original Perseus PS; I bought a replacement from Jameco part no. 168605, around $13 (actually I bought two) and it works fine. Search this group for "Jameco" and you should see some more reviews.
--- In perseus_SDR@yahoogroups.com, longwave@... wrote:
> While on a dx trip to Nebraska my power supply became cranky. Specifically it looks like a break somewhere near the end of the plug (nearest the Perseus input). Was able make the connection more rigid and also have a second power supply from a second Perseus that someone else brought with them. Should be able to get the original fixed but I am looking for a dealer or somewhere where I can find the correct type of of power supply here in the U.S.
> Keith McGinnis
> Hingham MA
- Jurgen -
You are totally correct. My bad memory told me that when in sleep mode, power was still used by Perseus. I did a measurement tonight and realized I was thinking of the state when Perseus is connected to the USB port but Perseus software is not running (.47A for me).
So you are right that an external relay is not needed.
Sorry to have made this more work than it should be.
--- In perseus_SDR@yahoogroups.com, "Jurgen Bartels" <jurgenb2@...> wrote:
> > This is a comedy of errors. Because you made a point of the USB port
> > powering, I believed you could only care aboutthat if the USB port is
> > supplying power to Perseus.
> No, it seems you got me wrong here. :-(
> > From what you wrote below, perhaps we agreed since the beginning that the
> > laptop should not supply power from USB for Perseus.
> > So I am back to my original question: I want to control the power from the 6V
> > battery to the LDO regulator that I used to power the Perseus. Do you have
> > interest in adding USB control of a relay for that? I can supply tested C#
> > code to do that job.
> Re-iterating my previous statement, now as a state table:
> --normal operation--
> PC= runs, so USB voltage=5V, and thus Perseus draws 700mA off the 6V batt.
> --PC is sent to hybernate--
> PC= off, so USB voltage=0V, and thus Perseus draws 0mA off the 6V batt.
> You see that there's no need for an extra switch in the LDO to disconnect the
> 6V battery, Perseus is already doing it on its own.
> If you still want that, then use the USB-5V as the controlling voltage for the
> switch. When the PC is off, the voltage is 0V.
> So I see no reason that SL should duplicate that function.
> I hope that clears it up a bit more.
> Jurgen Bartels Suellwarden, N. Germany
> Ant. hor: 29-45MHz 7-el, 45-87MHz 11-el, FM 15.11, Band-3:13-el, UHF:48-el
> TV: Winradio G305 / Fly2000 + video noise filter & variable IF BW
> FM: Downconverter + Perseus + Speclab as WFM demod.
> MW: 30 x 4m EWE 320° with JB-terminator, Winradio & Perseus