Re: [time-nuts] GPS at 60,000 feet
That jump cost $$millions :) I bet they had a Saasm on board.. Bye, Said On Jan 29, 2013, at 15:09, Magnus Danielson mag...@rubidium.dyndns.org wrote: Hi Said, On 01/29/2013 11:39 PM, Said Jackson wrote: Ublox limits it to 164,000 feet or 50,000m. Pretty much higher than any ballon would go I think. Well, then we have a particular space-jumper which was in the vincinity of that height. You should get yourself a GPS simulator. For your purposes the Pendulum GPS simulator should be the cost-effective solution, but maybe you can afford the full-blown Spirent simulator. For most lab-bench tests, the simpler Pendulum has found good use even for those having the full-blown. Wish I could afford one myself. Would be fun. Cheers, Magnus Bye, Said Sent From iPhone On Jan 29, 2013, at 13:24, Mike Smi...@flatsurface.com wrote: On 1/29/2013 1:55 PM, saidj...@aol.com wrote: Note that this is higher than the older GPS would support, due to the new Wassenaar speed/altitude limits. What are the current limits? UBlox is Swiss, and therefore subject to Wassenaar. Are there any GPS chip makers in China (or ?), who wouldn't be subject to any limitations? ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Riley paper on Tight Phase Lock Loop
Gentlemen, I've been a lurker on this list since early in 2012. I do not possess a technical background but do have some interest in time measurement topics. I was reading some of W. J. Riley's papers and saw that after the long and contentious discussion on this list Mr Riley built and tested a tight phase lock loop system. I have failed to turn up any mention of his paper on this list and was curious if anyone has read it or perhaps duplicated it? He writes HP 10811 ovenized crystal oscillators are used as both the locked oscillator and PLL reference, and the system thus measures the combined instability of two presumed identical and uncorrelated devices. He further notes that These results agree well with other measurements for this type of crystal oscillator. The paper is found at: http://www.stable32.com/Frequency%20Stability%20Measurements%20Using%20a%20Tight%20Phase%20Lock%20Loop.pdf The construction is described in greater detail in a separate paper: http://www.stable32.com/A%2010%20MHz%20OCVCXO%20and%20PLL%20Module.pdf The OCVCXO and PLL Board described therein appears to be a very versatile piece of gear for anyone using 10811's. Riley gives an example using the module to clean-up the output of a LPRO-101 rubidium (page 9). Regards, Bob Darby ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Riley paper on Tight Phase Lock Loop
Hi Bob, The TPLL method is described by NIST: http://tf.nist.gov/phase/Properties/one.htm A few years ago it was re-developed by WarrenS, a dedicated and frequent contributor to this list. See also John Miles excellent report: http://www.ke5fx.com/tpll.htm Or if that's dead, see http://web.archive.org/web/*/http://www.ke5fx.com/tpll.htm It's nice that W.J. Riley also tried it. If you know Bill, he makes us all look like amateurs. We know cases where TPLL works quite well; there are other cases where it doesn't. It would be nice if either Warren or John or Bill or anyone else posted a real schematic and BOM so that others could reliably duplicate, corroborate, refute, or refine their results. For some reason, it's like a big mystery; very unlike what we try to foster here on time-nuts: the free sharing of information, methods, experience, designs, results, and conclusions. /tvb - Original Message - From: Robert Darby bobda...@triad.rr.com To: time-nuts@febo.com Sent: Wednesday, January 30, 2013 10:32 AM Subject: [time-nuts] Riley paper on Tight Phase Lock Loop Gentlemen, I've been a lurker on this list since early in 2012. I do not possess a technical background but do have some interest in time measurement topics. I was reading some of W. J. Riley's papers and saw that after the long and contentious discussion on this list Mr Riley built and tested a tight phase lock loop system. I have failed to turn up any mention of his paper on this list and was curious if anyone has read it or perhaps duplicated it? He writes HP 10811 ovenized crystal oscillators are used as both the locked oscillator and PLL reference, and the system thus measures the combined instability of two presumed identical and uncorrelated devices. He further notes that These results agree well with other measurements for this type of crystal oscillator. The paper is found at: http://www.stable32.com/Frequency%20Stability%20Measurements%20Using%20a%20Tight%20Phase%20Lock%20Loop.pdf The construction is described in greater detail in a separate paper: http://www.stable32.com/A%2010%20MHz%20OCVCXO%20and%20PLL%20Module.pdf The OCVCXO and PLL Board described therein appears to be a very versatile piece of gear for anyone using 10811's. Riley gives an example using the module to clean-up the output of a LPRO-101 rubidium (page 9). Regards, Bob Darby ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Riley paper on Tight Phase Lock Loop
Hi Tom, Bill has actually published detailed schematics etc here: http://www.stable32.com/A%2010%20MHz%20OCVCXO%20and%20PLL%20Module.pdf Btw. what do you think about his small DMTD system? http://www.wriley.com/A%20Small%20DMTD%20System.pdf Adrian Tom Van Baak schrieb: Hi Bob, The TPLL method is described by NIST: http://tf.nist.gov/phase/Properties/one.htm A few years ago it was re-developed by WarrenS, a dedicated and frequent contributor to this list. See also John Miles excellent report: http://www.ke5fx.com/tpll.htm Or if that's dead, see http://web.archive.org/web/*/http://www.ke5fx.com/tpll.htm It's nice that W.J. Riley also tried it. If you know Bill, he makes us all look like amateurs. We know cases where TPLL works quite well; there are other cases where it doesn't. It would be nice if either Warren or John or Bill or anyone else posted a real schematic and BOM so that others could reliably duplicate, corroborate, refute, or refine their results. For some reason, it's like a big mystery; very unlike what we try to foster here on time-nuts: the free sharing of information, methods, experience, designs, results, and conclusions. /tvb - Original Message - From: Robert Darby bobda...@triad.rr.com To: time-nuts@febo.com Sent: Wednesday, January 30, 2013 10:32 AM Subject: [time-nuts] Riley paper on Tight Phase Lock Loop Gentlemen, I've been a lurker on this list since early in 2012. I do not possess a technical background but do have some interest in time measurement topics. I was reading some of W. J. Riley's papers and saw that after the long and contentious discussion on this list Mr Riley built and tested a tight phase lock loop system. I have failed to turn up any mention of his paper on this list and was curious if anyone has read it or perhaps duplicated it? He writes HP 10811 ovenized crystal oscillators are used as both the locked oscillator and PLL reference, and the system thus measures the combined instability of two presumed identical and uncorrelated devices. He further notes that These results agree well with other measurements for this type of crystal oscillator. The paper is found at: http://www.stable32.com/Frequency%20Stability%20Measurements%20Using%20a%20Tight%20Phase%20Lock%20Loop.pdf The construction is described in greater detail in a separate paper: http://www.stable32.com/A%2010%20MHz%20OCVCXO%20and%20PLL%20Module.pdf The OCVCXO and PLL Board described therein appears to be a very versatile piece of gear for anyone using 10811's. Riley gives an example using the module to clean-up the output of a LPRO-101 rubidium (page 9). Regards, Bob Darby ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Riley paper on Tight Phase Lock Loop
It would be nice if a real schematic and BOM was posted. it's like a big mystery ... /tvb As Adrian and Bob pointed out, W. J. Riley's site has all the information needed to make the higher cost TPLL version he did including his PCBs. The bigger mystery seems to be how easy a TPLL can be built without loosing performance. One version of the TPLL tester only needs 8 circuit parts plus + Power supplies etc, These are all clearly specified on the bottom block diagram, dated June 7, 2010 at http://www.ke5fx.com/tpll.htm And even that complete working, simple version, is good enough that the performance is still mostly limited by the HP10811 Reference Osc and not the TPLL circuit. BOM for Extra simple TPLL Nothing is critical, performance is determined by the Ref Osc. 1) Phase detector = SYPD-1 2) 100KHz LPF = two each 220 ohm in series and two 0.0047uf caps to gnd 3) Amp = OP-27 Pin 3 is input, pin 6 is output 4) Amp feedback gain = + 300 set using a 30K feedback and 100 Ohm resistor to gnd 5) 20 Hz LPF = 8K ohm series R and 1uf to gnd 6) Ref Osc = HP10811 7) A slow mv DVM and/or a 16 bit ADC sampling at 100Hz or more. 8) misc connectors, PS, S/W, etc. The configuration of the TPLL 1.0 that John tested, uses a 3dB and 5dB pad for isolation, (no real need for Osc buffers), and has a higher closed loop PLL bandwidth using an op37 with more gain, (a tighter TPLL) This can be seen by clicking on the underlined Here of John's report next to Fig 1.7 at Warren's annotated block diagram can be seen HERE. ws Hi Tom, Bill has actually published detailed schematics etc here: http://www.stable32.com/A%2010%20MHz%20OCVCXO%20and%20PLL%20Module.pdf Btw. what do you think about his small DMTD system? http://www.wriley.com/A%20Small%20DMTD%20System.pdf Adrian *** Tom Van Baak schrieb: Hi Bob, The TPLL method is described by NIST: http://tf.nist.gov/phase/Properties/one.htm A few years ago it was re-developed by WarrenS, a dedicated and frequent contributor to this list. See also John Miles excellent report: http://www.ke5fx.com/tpll.htm Or if that's dead, see http://web.archive.org/web/*/http://www.ke5fx.com/tpll.htm It's nice that W.J. Riley also tried it. If you know Bill, he makes us all look like amateurs. We know cases where TPLL works quite well; there are other cases where it doesn't. It would be nice if either Warren or John or Bill or anyone else posted a real schematic and BOM so that others could reliably duplicate, corroborate, refute, or refine their results. For some reason, it's like a big mystery; very unlike what we try to foster here on time-nuts: the free sharing of information, methods, experience, designs, results, and conclusions. /tvb * - Original Message - From: Robert Darby bobdarby at triad.rr.com To: time-nuts at febo.com Sent: Wednesday, January 30, 2013 10:32 AM Subject: [time-nuts] Riley paper on Tight Phase Lock Loop Gentlemen, I've been a lurker on this list since early in 2012. I do not possess a technical background but do have some interest in time measurement topics. I was reading some of W. J. Riley's papers and saw that after the long and contentious discussion on this list Mr Riley built and tested a tight phase lock loop system. I have failed to turn up any mention of his paper on this list and was curious if anyone has read it or perhaps duplicated it? He writes HP 10811 ovenized crystal oscillators are used as both the locked oscillator and PLL reference, and the system thus measures the combined instability of two presumed identical and uncorrelated devices. He further notes that These results agree well with other measurements for this type of crystal oscillator. The paper is found at: http://www.stable32.com/Frequency%20Stability%20Measurements%20Using%20a%20Tight%20Phase%20Lock%20Loop.pdf The construction is described in greater detail in a separate paper: http://www.stable32.com/A%2010%20MHz%20OCVCXO%20and%20PLL%20Module.pdf The OCVCXO and PLL Board described therein appears to be a very versatile piece of gear for anyone using 10811's. Riley gives an example using the module to clean-up the output of a LPRO-101 rubidium (page 9). Regards, Bob Darby ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Low noise power supplies?
I know this topic has been discussed in the past on the list, but a colleague is asking if there are any off the shelf low noise power supplies for testing oscillators. Something a cut above an HP brick lab power supply etc. They are hoping to avoid having to homebrew a power conditioning circuit. Did we ever arrive at a concensus as to the state of the art in homebrew power conditioning circuits? Any help would be appreciated. Rick Karlquist N6RK ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Anyone Using a Yahoo Email Account - PLEASE READ !!
Folks, As you have seen, the Group has been getting sammed lately. Most soams never get posted to the Group, but some do. These apparently come from hacked Yahoo email accounts. Yahoo itself was hacked, and the passwords to about half a million Yahoo email addresses were obtained.There are articles about it here http://www.ibtimes.com/yahoo-password-hack-where-find-list-hacked-email-accounts-722396 and here http://mashable.com/2012/07/12/yahoo-voices-hacked/. The latter article also gives a link to see whether your particular address is on the list. What is happening here is that the hackers have obtained access to other people's Yahoo email accounts. If that applies to your address, they can read all your mail, and send mails /as though they were you./ So they will happily spam any groups that are connected with that email address. We have now had several cases of it in a matter of a few days, so I thought it time to take action. PLEASE: If you use a Yahoo account to access this Group, either check the second link and change your password, or just change your password. Thank you, -John === ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Low noise power supplies?
The typical test supply on a bench for clean VCO testing is a small gel cell battery. For a regulated power supply, make one using a 723. The 723 has far lower noise out than the monolithic regulators. Lester B Veenstra MØYCM K1YCM W8YCM les...@veenstras.com US Postal Address: 5 Shrine Club Drive HC84 Box 89C Keyser WV 26726 GPS: 39.33675 N 78.9823527 W Telephones: Home: +1-304-289-6057 US cell +1-304-790-9192 UK cell +44-(0)7849-248-749 Guam Cell: +1-671-929-8141 Jamaica: +1-876-456-8898 This e-mail and any documents attached hereto contain confidential or privileged information. The information is intended to be for use only by the individual or entity to whom they are addressed. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, be aware that any disclosure, copying, distribution or use of the contents of this e-mail or any documents attached hereto is prohibited. -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Richard (Rick) Karlquist Sent: Wednesday, January 30, 2013 9:17 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Low noise power supplies? I know this topic has been discussed in the past on the list, but a colleague is asking if there are any off the shelf low noise power supplies for testing oscillators. Something a cut above an HP brick lab power supply etc. They are hoping to avoid having to homebrew a power conditioning circuit. Did we ever arrive at a concensus as to the state of the art in homebrew power conditioning circuits? Any help would be appreciated. Rick Karlquist N6RK ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Low noise power supplies?
On Wed, Jan 30, 2013 at 6:16 PM, Richard (Rick) Karlquist rich...@karlquist.com wrote: I know this topic has been discussed in the past on the list, but a colleague is asking if there are any off the shelf low noise power supplies for testing oscillators. Something a cut above an HP brick lab power supply etc. For once the best is also cheap: Batteries. But not all batteries are the same. You want one with low internal resistance, so a lead acid flooded battery will be the best. Chris Albertson Redondo Beach, California ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Low noise power supplies?
On 1/30/13 8:28 PM, Chris Albertson wrote: For once the best is also cheap: Batteries. But not all batteries are the same. You want one with low internal resistance, so a lead acid flooded battery will be the best. Most NiCd have very low internal resistance.. much lower than lead acid. But aside from batteries, Rick's question is interesting, and I'd turn it around a bit.. What off the shelf catalog product has the lowest noise? Do you go get a linear regulated supply from someone like Acopian? And even more interesting.. if you're concerned about efficiency and want to use a DC/DC switcher to convert some ratty DC supply (12V vehicle power, or a solar panel, for instance) to something really quiet, what's the best strategy, using off the shelf bricks and modules. That is, I'm sure someone could do a fabulous job with a box full of Ls and Cs and discrete components and a couple months to design, prototype, and build.. but if someone came to you and said, we want a mobile microwave system to study propagation in 3 weeks because they just got permission to go up on some mountain. Something like a CW carrier at tens of GHz multiplied up from your very quiet oscillator, and they're going to look at turbulence and scintillation in the path, so time scales of milliseconds to 1000s of seconds are important. What would you order from Newark, Allied, mouser, etc. (assuming you have your OCXOs and such sitting around). ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Low noise power supplies?
On Wed, Jan 30, 2013 at 9:05 PM, Jim Lux jim...@earthlink.net wrote: On 1/30/13 8:28 PM, Chris Albertson wrote: For once the best is also cheap: Batteries. But not all batteries are the same. You want one with low internal resistance, so a lead acid flooded battery will be the best. Most NiCd have very low internal resistance.. much lower than lead acid Really? I'm talking about flooded cells not gel. I think large automotive engine start battery might only have 20 milliohms resistance. But the only NiCd I know about are the AA sized ones. Not fair to compare. Perhaps a size size NiCd would be even better. I don't know. Got a reference, Google did not turn up much. I'd expect that some place there might be a table. I've powered resonably large transmitters with a bank of golf cart batteries. Not because I needed the low noise but because this was on a sail boat in the ocean. Chris Albertson Redondo Beach, California ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Low noise power supplies?
Lester Veenstra wrote: The typical test supply on a bench for clean VCO testing is a small gel cell battery. For a regulated power supply, make one using a 723. The 723 has far lower noise out than the monolithic regulators. Depends on the variety of 723 some are noisier than others. Some use an internal zener reference, some use a bandgap reference. The original used a zener reference. Bruce Lester B Veenstra MØYCM K1YCM W8YCM les...@veenstras.com US Postal Address: 5 Shrine Club Drive HC84 Box 89C Keyser WV 26726 GPS: 39.33675 N 78.9823527 W Telephones: Home: +1-304-289-6057 US cell+1-304-790-9192 UK cell+44-(0)7849-248-749 Guam Cell: +1-671-929-8141 Jamaica: +1-876-456-8898 This e-mail and any documents attached hereto contain confidential or privileged information. The information is intended to be for use only by the individual or entity to whom they are addressed. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, be aware that any disclosure, copying, distribution or use of the contents of this e-mail or any documents attached hereto is prohibited. -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Richard (Rick) Karlquist Sent: Wednesday, January 30, 2013 9:17 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Low noise power supplies? I know this topic has been discussed in the past on the list, but a colleague is asking if there are any off the shelf low noise power supplies for testing oscillators. Something a cut above an HP brick lab power supply etc. They are hoping to avoid having to homebrew a power conditioning circuit. Did we ever arrive at a concensus as to the state of the art in homebrew power conditioning circuits? Any help would be appreciated. Rick Karlquist N6RK ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Low noise power supplies?
A123 20Ah LiFePO4 cells have an internal resistance in the milliohm range. Their M1 26650 format cells are around 8 milliohms. Most high capacity (3000 mAh) 18650 style lithium cells are around 10-15 milliohms. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Low noise power supplies?
But the only NiCd I know about are the AA sized ones. I have some of the wet NiCd batteries that are capable of putting out 200A continuously. I'm assuming the internal resistance is pretty low. ;-) Arthur ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Low noise power supplies?
YUP, The C-130 aircraft uses larger than car battery size wet NiCd to fire up the Genset that is used to start the Tubo-prop jet engines. Definitely has lower resistance then the Lead-Acid wet cell. BillWB6BNQ Arthur Dent wrote: But the only NiCd I know about are the AA sized ones. I have some of the wet NiCd batteries that are capable of putting out 200A continuously. I'm assuming the internal resistance is pretty low. ;-) Arthur ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Low noise power supplies?
Hi Rick; Starting with a hp supply this finesse regulator will really clean up the output. http://www.wenzel.com/documents/finesse.html Best Wishes; Thomas Knox Date: Wed, 30 Jan 2013 18:16:46 -0800 From: rich...@karlquist.com To: time-nuts@febo.com Subject: [time-nuts] Low noise power supplies? I know this topic has been discussed in the past on the list, but a colleague is asking if there are any off the shelf low noise power supplies for testing oscillators. Something a cut above an HP brick lab power supply etc. They are hoping to avoid having to homebrew a power conditioning circuit. Did we ever arrive at a concensus as to the state of the art in homebrew power conditioning circuits? Any help would be appreciated. Rick Karlquist N6RK ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Low noise power supplies?
Rick, I'm just finishing up some low noise supplies that use the TPSA49xx regulator. The AC input is a 12 AC wall wart and it uses zener/darlington pre-regulators. +5 and +3.3 V @ 150 ma each. I have the boards in hand and am ordering parts. The voltages are tweakable. i.e. 5.1V and 3.4V for instance. If this is of some interest I will be making the boards available once the design is tested. That will allow you to customize the voltages if you need something different. I also have a board on the way that includes the above two voltages and +/- 12V @ 150 ma. The voltages are tweakable so you can get +5.1 V and 3.4V and +/-12.3 - for instance. If this is of some interest let me know and I'll push them along. If you have questions - ask. I also have a LM1117 board that is good for 800 ma each @ +5 and +3.3. Not so quiet but more current. That one requires a 12.6V AC CT transformer. Of course you can use a higher input voltage but it will reduce the maximum current. That is tested and for sale now. You can also get different voltages by adjusting components. Schematics, parts lists, and ordering instructions: http://spacetimepro.blogspot.com/2012/10/power-up.html Simon Engineering is the art of making what you want from what you can get at a profit. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
