Posted by ian field on June 8, 2009, 5:29 pm
> ian field wrote:
>>
>>> On Mon, 8 Jun 2009 21:08:45 +0100, "ian field"
>>>
>>>>
>>>>> On Mon, 08 Jun 2009 05:15:35 -0400, "Michael A. Terrell"
>>>>>
>>>>>>Jon Kirwan wrote:
>>>>>>>
>>>>>>> On Mon, 08 Jun 2009 01:37:52 -0700, Jon Kirwan
>>>>>>>
>>>>>>> >On Mon, 08 Jun 2009 00:11:45 -0400, "Michael A. Terrell"
>>>>>>> >
>>>>>>> >>Jon Kirwan wrote:
>>>>>>> >>>
>>>>>>> >>> On Sun, 7 Jun 2009 17:10:26 -0700, "BobW"
>>>>>>> >>>
>>>>>>> >>> >
>>>>>>> >>> >> Hi,
>>>>>>> >>> >>
>>>>>>> >>> >> I need to generate a symmetric +/-5V supply from a single
>>>>>>> >>> >> +12V supply. I
>>>>>>> >>> >> need about 150mA from the +5V side, and less than 50mA
>>>>>>> >>> >> from the -5V side.
>>>>>>> >>> >>
>>>>>>> >>> >> I've thought about using two 7805 in the following
>>>>>>> >>> >> configuration
>>>>>>> >>> >> :
>>>>>>> >>> >>
>>>>>>> >>> >>
>>>>>>> >>> >> Supply + ----+--------[7805]---- +5 V
>>>>>>> >>> >> | |
>>>>>>> >>> >> `-[7805]----+------ 0v
>>>>>>> >>> >> |
>>>>>>> >>> >> Supply - ---------+------------- -5V
>>>>>>> >>> >>
>>>>>>> >>> >>
>>>>>>> >>> >> does it make sense ? Would it be OK for the 7805 to sink
>>>>>>> >>> >> current
>>>>>>> >>> >> instead
>>>>>>> >>> >> of sourcing current, in the case of the 7805 in charge of
>>>>>>> >>> >> the 0V
>>>>>>> >>> >> supply ?
>>>>>>> >>> >>
>>>>>>> >>> >> If this idea is garbage, what would be the recommended
>>>>>>> >>> >> solution to this
>>>>>>> >>> >> problem ?
>>>>>>> >>> >>
>>>>>>> >>> >> Thanks.
>>>>>>> >>> >
>>>>>>> >>> >See alt.binaries.schematics.electronic for a (linear)
>>>>>>> >>> >circuit that
>>>>>>> >>> >will work
>>>>>>> >>> >up to about 200mA on each supply with a minimum input
>>>>>>> >>> >voltage of 10.6V.
>>>>>>> >>>
>>>>>>> >>> Sadly, Verizon (and other major service providers) have
>>>>>>> >>> completely
>>>>>>> >>> eliminated all alt.* groups from their servers. This affects
>>>>>>> >>> me, as
>>>>>>> >>> well. It may yet force me to get an extra-cost service
>>>>>>> >>> added.
>>>>>>> >>
>>>>>>> >> I know I've posted this link at least a dozen times. It is
>>>>>>> >> a
>>>>>>> >> read
>>>>>>> >>only portal for selected binaries newsgroups.
>>>>>>> >>
>>>>>>> >>http://www.usenet-replayer.com/
>>>>>>> >
>>>>>>> >First time it got my attention. I'll give it a shot.
>>>>>>> >
>>>>>>> >Thanks,
>>>>>>> >Jon
>>>>>>>
>>>>>>> Okay. It got my attention long enough to register and check for
>>>>>>> the
>>>>>>> group, alt.binaries.schematics.electronic. It doesn't appear on
>>>>>>> their
>>>>>>> list. Besides, they don't support NNTP and would be quite
>>>>>>> difficult to make use of, if I understand what this means.
>>>>>>>
>>>>>>> In short, it doesn't look usable for this purpose because it
>>>>>>> doesn't
>>>>>>> include the group. And it doesn't look usable, more generally,
>>>>>>> because the mechanism (emailing every message, or every message
>>>>>>> of a thread) isn't a means I would willingly choose.
>>>>>>
>>>>>> that's strange, because I've used it when the Earthlink news
>>>>>> farm was
>>>>>>dying. It is like Google groups, except it is a read only portal.
>>>>>>I
>>>>>>used it when someone mentioned a binary file on the group. The
>>>>>>propogation is slow, but most binaries from the group do end up
>>>>>>there.
>>>>>>
>>>>>>http://www.usenet-replayer.com/groups/alt.binaries.schematics.electronic.html
>>>>>
>>>>> Thanks. What I did before was to go to the main page at which you
>>>>> referred me and then clicked on "get the USENET messages" link.
>>>>> That took me to:
>>>>>
>>>>> http://www.usenet-replayer.com/sign_up_feed.html
>>>>>
>>>>> I then went through the process of signing up. They sent me an
>>>>> email,
>>>>> which I saved and edited into an HTML page. Loaded that, then
>>>>> clicked
>>>>> on the "Feed On" button. (I gather they allow me to sign up for 10
>>>>> different groups.) When I clicked that JAVA link, it set me up on
>>>>> a page where I could ask it to display the ALT groups I might want
>>>>> to
>>>>> include in my 10. alt.binaries.schematics.electronic wasn't in the
>>>>> list.
>>>>>
>>>>> What you've shown me is something different. It appears to be a
>>>>> bit
>>>>> strange. I'm struggling with the format, which appears to only be
>>>>> the
>>>>> pictures and no text bodies when messages don't include pictures.
>>>>> If so, that means I may be able to access pictures this way but not
>>>>> comments sent to the group about them. Threading seems... well,
>>>>> I'm
>>>>> not seeing how, yet. It looks as though I may be able to pick up
>>>>> on
>>>>> some pictures this way, though. If I'm quick about it... otherwise
>>>>> I may have to weed through pages and hope that my eye can pick out
>>>>> what I'm looking for in the thumbnails.
>>>>>
>>>>> Perhaps they don't include alt.binaries.schematics.electronic in
>>>>> their emailing service, but do offer a web page with pictures-only
>>>>> component from the group?
>>>>>
>>>>> Jon
>>>>
>>>>Google for binary news server - there's some freebies listed.
>>>
>>> I did, some time ago. Finding a good NNTP server that includes a
>>> binary newsgroup like alt.binaries.schematics.electronic was a "no
>>> show." I spent the spare time of a few days on it. Not looking
>>> forward to that, again. Especially, if someone has a specific idea
>>> on hand that does NNTP for that group in particular.
>>>
>>> Of course, when I get a strong enough interest to push the time
>>> envelop out some more in the future, I'll take another shot at it.
>>>
>>> But for now, yeah. Been there, done that, came up zero.
>>>
>>> Jon
>>
>> One I clicked on installed as server name: 202.177.16.1321 it seems to
>> work and carries alt.binaries,schematics.electronic
> Ian. Would you like to correct that ip 202.177.16.??? I guessing its
> 132. Since that responds with "Operation in Progress"
> --
> Best Regards:
> Baron.
121
Posted by Jon Kirwan on June 8, 2009, 7:07 pm
On Mon, 8 Jun 2009 22:29:26 +0100, "ian field"
><snip>
>121
Aka freenews.netfront.net
Got it working. Thanks!
Jon
Posted by BobW on June 8, 2009, 8:36 pm
> On Mon, 8 Jun 2009 22:29:26 +0100, "ian field"
>><snip>
>>121
> Aka freenews.netfront.net
> Got it working. Thanks!
> Jon
WTF? Did you try going to:
http://freenews.netfront.net
Bob
--
== All google group posts are automatically deleted due to spam ==
Posted by Jon Kirwan on June 8, 2009, 9:20 pm
On Mon, 8 Jun 2009 17:36:08 -0700, "BobW"
>> On Mon, 8 Jun 2009 22:29:26 +0100, "ian field"
>>
>>><snip>
>>>121
>>
>> Aka freenews.netfront.net
>>
>> Got it working. Thanks!
>>
>> Jon
>WTF? Did you try going to:
>http://freenews.netfront.net
Nope. Didn't. I pinged it like this:
>: C:\>ping freenews.netfront.net
>:
>: Pinging freenews.netfront.net [202.177.16.121] with 32 bytes of data:
>:
>: Reply from 202.177.16.121: bytes=32 time=223ms TTL=52
>: Reply from 202.177.16.121: bytes=32 time=241ms TTL=52
>: Reply from 202.177.16.121: bytes=32 time=221ms TTL=52
>: Reply from 202.177.16.121: bytes=32 time=227ms TTL=52
>:
>: Ping statistics for 202.177.16.121:
>: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
>: Approximate round trip times in milli-seconds:
>: Minimum = 221ms, Maximum = 241ms, Average = 228ms
That matched up with what IAN posted. So I just used it with NNTP:,
not HTTP:. Worked to get a few things, including your post there. I
was also able to pull down a list of newsgroups they support and add
that to my newsgroup directory list of lists.
I didn't expect it to support serving out HTML, so I didn't expect an
answer to http: requests.
Is there something you discovered?
Jon
Posted by BobW on June 8, 2009, 9:29 pm
> On Mon, 8 Jun 2009 17:36:08 -0700, "BobW"
>>> On Mon, 8 Jun 2009 22:29:26 +0100, "ian field"
>>>
>>>><snip>
>>>>121
>>>
>>> Aka freenews.netfront.net
>>>
>>> Got it working. Thanks!
>>>
>>> Jon
>>
>>WTF? Did you try going to:
>>
>>http://freenews.netfront.net
> Nope. Didn't. I pinged it like this:
>>: C:\>ping freenews.netfront.net
>>:
>>: Pinging freenews.netfront.net [202.177.16.121] with 32 bytes of data:
>>:
>>: Reply from 202.177.16.121: bytes=32 time=223ms TTL=52
>>: Reply from 202.177.16.121: bytes=32 time=241ms TTL=52
>>: Reply from 202.177.16.121: bytes=32 time=221ms TTL=52
>>: Reply from 202.177.16.121: bytes=32 time=227ms TTL=52
>>:
>>: Ping statistics for 202.177.16.121:
>>: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
>>: Approximate round trip times in milli-seconds:
>>: Minimum = 221ms, Maximum = 241ms, Average = 228ms
> That matched up with what IAN posted. So I just used it with NNTP:,
> not HTTP:. Worked to get a few things, including your post there. I
> was also able to pull down a list of newsgroups they support and add
> that to my newsgroup directory list of lists.
> I didn't expect it to support serving out HTML, so I didn't expect an
> answer to http: requests.
> Is there something you discovered?
> Jon
When you just put that URL into a browser it says, "It works!"
I didn't realize that NNTP was the name of the transfer protocol for usenet.
I'll try that server on my newsreader and see if anyone salutes.
Bob
--
== All google group posts are automatically deleted due to spam ==
Re: Generate -+5V from 12V
Re: Generate -+5V from 12V
>>
>>> On Mon, 8 Jun 2009 21:08:45 +0100, "ian field"
>>>
>>>>
>>>>> On Mon, 08 Jun 2009 05:15:35 -0400, "Michael A. Terrell"
>>>>>
>>>>>>Jon Kirwan wrote:
>>>>>>>
>>>>>>> On Mon, 08 Jun 2009 01:37:52 -0700, Jon Kirwan
>>>>>>>
>>>>>>> >On Mon, 08 Jun 2009 00:11:45 -0400, "Michael A. Terrell"
>>>>>>> >
>>>>>>> >>Jon Kirwan wrote:
>>>>>>> >>>
>>>>>>> >>> On Sun, 7 Jun 2009 17:10:26 -0700, "BobW"
>>>>>>> >>>
>>>>>>> >>> >
>>>>>>> >>> >> Hi,
>>>>>>> >>> >>
>>>>>>> >>> >> I need to generate a symmetric +/-5V supply from a single
>>>>>>> >>> >> +12V supply. I
>>>>>>> >>> >> need about 150mA from the +5V side, and less than 50mA
>>>>>>> >>> >> from the -5V side.
>>>>>>> >>> >>
>>>>>>> >>> >> I've thought about using two 7805 in the following
>>>>>>> >>> >> configuration
>>>>>>> >>> >> :
>>>>>>> >>> >>
>>>>>>> >>> >>
>>>>>>> >>> >> Supply + ----+--------[7805]---- +5 V
>>>>>>> >>> >> | |
>>>>>>> >>> >> `-[7805]----+------ 0v
>>>>>>> >>> >> |
>>>>>>> >>> >> Supply - ---------+------------- -5V
>>>>>>> >>> >>
>>>>>>> >>> >>
>>>>>>> >>> >> does it make sense ? Would it be OK for the 7805 to sink
>>>>>>> >>> >> current
>>>>>>> >>> >> instead
>>>>>>> >>> >> of sourcing current, in the case of the 7805 in charge of
>>>>>>> >>> >> the 0V
>>>>>>> >>> >> supply ?
>>>>>>> >>> >>
>>>>>>> >>> >> If this idea is garbage, what would be the recommended
>>>>>>> >>> >> solution to this
>>>>>>> >>> >> problem ?
>>>>>>> >>> >>
>>>>>>> >>> >> Thanks.
>>>>>>> >>> >
>>>>>>> >>> >See alt.binaries.schematics.electronic for a (linear)
>>>>>>> >>> >circuit that
>>>>>>> >>> >will work
>>>>>>> >>> >up to about 200mA on each supply with a minimum input
>>>>>>> >>> >voltage of 10.6V.
>>>>>>> >>>
>>>>>>> >>> Sadly, Verizon (and other major service providers) have
>>>>>>> >>> completely
>>>>>>> >>> eliminated all alt.* groups from their servers. This affects
>>>>>>> >>> me, as
>>>>>>> >>> well. It may yet force me to get an extra-cost service
>>>>>>> >>> added.
>>>>>>> >>
>>>>>>> >> I know I've posted this link at least a dozen times. It is
>>>>>>> >> a
>>>>>>> >> read
>>>>>>> >>only portal for selected binaries newsgroups.
>>>>>>> >>
>>>>>>> >>http://www.usenet-replayer.com/
>>>>>>> >
>>>>>>> >First time it got my attention. I'll give it a shot.
>>>>>>> >
>>>>>>> >Thanks,
>>>>>>> >Jon
>>>>>>>
>>>>>>> Okay. It got my attention long enough to register and check for
>>>>>>> the
>>>>>>> group, alt.binaries.schematics.electronic. It doesn't appear on
>>>>>>> their
>>>>>>> list. Besides, they don't support NNTP and would be quite
>>>>>>> difficult to make use of, if I understand what this means.
>>>>>>>
>>>>>>> In short, it doesn't look usable for this purpose because it
>>>>>>> doesn't
>>>>>>> include the group. And it doesn't look usable, more generally,
>>>>>>> because the mechanism (emailing every message, or every message
>>>>>>> of a thread) isn't a means I would willingly choose.
>>>>>>
>>>>>> that's strange, because I've used it when the Earthlink news
>>>>>> farm was
>>>>>>dying. It is like Google groups, except it is a read only portal.
>>>>>>I
>>>>>>used it when someone mentioned a binary file on the group. The
>>>>>>propogation is slow, but most binaries from the group do end up
>>>>>>there.
>>>>>>
>>>>>>http://www.usenet-replayer.com/groups/alt.binaries.schematics.electronic.html
>>>>>
>>>>> Thanks. What I did before was to go to the main page at which you
>>>>> referred me and then clicked on "get the USENET messages" link.
>>>>> That took me to:
>>>>>
>>>>> http://www.usenet-replayer.com/sign_up_feed.html
>>>>>
>>>>> I then went through the process of signing up. They sent me an
>>>>> email,
>>>>> which I saved and edited into an HTML page. Loaded that, then
>>>>> clicked
>>>>> on the "Feed On" button. (I gather they allow me to sign up for 10
>>>>> different groups.) When I clicked that JAVA link, it set me up on
>>>>> a page where I could ask it to display the ALT groups I might want
>>>>> to
>>>>> include in my 10. alt.binaries.schematics.electronic wasn't in the
>>>>> list.
>>>>>
>>>>> What you've shown me is something different. It appears to be a
>>>>> bit
>>>>> strange. I'm struggling with the format, which appears to only be
>>>>> the
>>>>> pictures and no text bodies when messages don't include pictures.
>>>>> If so, that means I may be able to access pictures this way but not
>>>>> comments sent to the group about them. Threading seems... well,
>>>>> I'm
>>>>> not seeing how, yet. It looks as though I may be able to pick up
>>>>> on
>>>>> some pictures this way, though. If I'm quick about it... otherwise
>>>>> I may have to weed through pages and hope that my eye can pick out
>>>>> what I'm looking for in the thumbnails.
>>>>>
>>>>> Perhaps they don't include alt.binaries.schematics.electronic in
>>>>> their emailing service, but do offer a web page with pictures-only
>>>>> component from the group?
>>>>>
>>>>> Jon
>>>>
>>>>Google for binary news server - there's some freebies listed.
>>>
>>> I did, some time ago. Finding a good NNTP server that includes a
>>> binary newsgroup like alt.binaries.schematics.electronic was a "no
>>> show." I spent the spare time of a few days on it. Not looking
>>> forward to that, again. Especially, if someone has a specific idea
>>> on hand that does NNTP for that group in particular.
>>>
>>> Of course, when I get a strong enough interest to push the time
>>> envelop out some more in the future, I'll take another shot at it.
>>>
>>> But for now, yeah. Been there, done that, came up zero.
>>>
>>> Jon
>>
>> One I clicked on installed as server name: 202.177.16.1321 it seems to
>> work and carries alt.binaries,schematics.electronic
> Ian. Would you like to correct that ip 202.177.16.??? I guessing its
> 132. Since that responds with "Operation in Progress"
> --
> Best Regards:
> Baron.