highaltitude.log.20210112

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[00:02] <SpacenearUS> New vehicle on the map: 03N1agv_chase - 12https://tracker.habhub.org/#!qm=All&q=N1agv_chase
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[00:21] <SpacenearUS> New vehicle on the map: 03WA1OJN_chase - 12https://tracker.habhub.org/#!qm=All&q=WA1OJN_chase
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[01:07] <SpacenearUS> New vehicle on the map: 03ITest_chase - 12https://tracker.habhub.org/#!qm=All&q=ITest_chase
[01:08] <SpacenearUS> New vehicle on the map: 03TestTest_chase - 12https://tracker.habhub.org/#!qm=All&q=TestTest_chase
[01:19] <SpacenearUS> New vehicle on the map: 03N0RC_chase - 12https://tracker.habhub.org/#!qm=All&q=N0RC_chase
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[06:43] <SpacenearUS> New vehicle on the map: 03N0CALL_chase - 12https://tracker.habhub.org/#!qm=All&q=N0CALL_chase
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[10:09] <SpacenearUS> New position from 03PS-80 after 0314 hours silence - 12https://tracker.habhub.org/#!qm=All&q=PS-80
[10:15] <SpacenearUS> New position from 03ES3BEC-11 after 0320 hours silence - 12https://tracker.habhub.org/#!qm=All&q=ES3BEC-11
[10:41] <SpacenearUS> New position from 03OZ7GZ-2 after 0316 hours silence - 12https://tracker.habhub.org/#!qm=All&q=OZ7GZ-2
[11:30] <SpacenearUS> New position from 03N4XWC-1 after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=N4XWC-1
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[13:21] <SpacenearUS> New vehicle on the map: 03KORA2 - 12https://tracker.habhub.org/#!qm=All&q=KORA2
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[14:46] <SpacenearUS> New position from 03WB6TOU-13 after 0316 hours silence - 12https://tracker.habhub.org/#!qm=All&q=WB6TOU-13
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[15:12] <hyde00001> Hi all, I'm hoping for some slightly topic advice - i have two analogue circuits I'm trying to persuade to talk to each other. The first outputs 0 to 10v the second inputs -5 to +5v. Can anyone nudge me in the right direction for a solution - from some searching it seems Op Amps are a routes but I can't find the right language/search terms to reveal a solution...
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[15:25] <PE2BZ> hyde00001, they share one ground I suppose ?
[15:27] <hyde00001> yes same ground
[15:27] <PE2BZ> Found the other way round https://www.google.com/url?sa=i&url=https%3A%2F%2Felectronics.stackexchange.com%2Fquestions%2F115535%2Fhow-to-rescale-10-10v-to-0-5-v&psig=AOvVaw1zHKUK7B5ClGPOnoNgeC2J&ust=1610551489294000&source=images&cd=vfe&ved=0CA0QjhxqFwoTCODVpIDalu4CFQAAAAAdAAAAABAK
[15:27] <hyde00001> Helpful - "rescale" being key term I wasn't using...
[15:28] <PE2BZ> https://www.google.com/url?sa=i&url=https%3A%2F%2Felectronics.stackexchange.com%2Fquestions%2F317458%2Flevel-shift-0-5v-to-10v-10v&psig=AOvVaw2l0BRywvwcLbmqQVsOjO0I&ust=1610551680960000&source=images&cd=vfe&ved=0CAIQjRxqFwoTCMivut_alu4CFQAAAAAdAAAAABAD
[15:28] <PE2BZ> level shift ?
[15:29] <hyde00001> Level shifting I've found seem to focus on digital re-scaling... ie on/off while I want the full range of voltages
[15:34] <nigle> The resistor values in that rescaling example are rather low, you can get away with making them a lot higher if current consumption is an issue.
[15:34] <hyde00001> Ohh linked from your suggestion was something that does 0 - 5v to -5 - +5v by combining the learnings from these designs I should be able to get somewhere...
[15:34] <hyde00001> https://electronics.stackexchange.com/questions/3042/converting-scaling-a-voltage-range-0v-5v-to-5v-5v?rq=1
[15:35] <hyde00001> Helpful thought re resistors - current not so much of an issue, but accuracy is, so I guess I'll need very high tolerance resistors...
[15:37] <nigle> Yes, lower values can help a bit with accuracy as the bias current of the opamp inputs has a smaller effect. Not really a problem with modern opamps though.
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[15:50] <hyde00001> V helpful. Thanks
[15:51] <hyde00001> FWIW, this is a calculator to help pick resistors for given voltage offsets: https://masteringelectronicsdesign.com/summing-amplifier-calculator-java/
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[15:59] <SpacenearUS> New position from 03icspace24 after 0316 hours silence - 12https://tracker.habhub.org/#!qm=All&q=icspace24
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[16:08] <nigle> This will do what you want: https://usercontent.irccloud-cdn.com/file/vgIqoGKC/Rescaler
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[16:15] <SpacenearUS> New vehicle on the map: 03Kd2vgt_chase - 12https://tracker.habhub.org/#!qm=All&q=Kd2vgt_chase
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[16:22] <hyde00001> Perfect!!! That design look similar to what I got by merging the two suggestions above - except mine was inverted at the op amp inout and so needed an annoying -5V source... Yours is much better!
[16:24] <SpacenearUS> New position from 03DL1XH-4FSK after 036 days silence - 12https://tracker.habhub.org/#!qm=All&q=DL1XH-4FSK
[16:36] <hyde00001> Aaah perhaps the op amp needs a -v supply anyway... so with either design I think I need a -v supply. Still trying to understand op amps...
[16:39] <systest> hyde00001, Check out https://www.youtube.com/watch?v=K03Rom3Cs28 "Basics of opamp circuits" I found it helpful
[16:46] <hyde00001> Look promising!
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[17:01] <nigle> Yes, a -v supply will be needed whatever you do. This may be available from the receiving device if you know where to find it, it doesn't have to be -5V though, -12V woud be fine too.
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[17:48] <SpacenearUS> New position from 03IDA-4FSK after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=IDA-4FSK
[17:48] <SpacenearUS> New position from 03IDA-RTTY after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=IDA-RTTY
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[18:31] <hyde00001> Cheers for all the op amp help! Look like I have a circuit design to help me interface the signals - now to order the parts and build it...
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[20:41] <SA6BSS-Mike> dl1xh prediction https://tracker.sondehub.org/?sondehub=1#!mt=roadmap&mz=7&qm=1_hour&mc=55.6646,16.3544&f=IDA-4FSK&q=!RS_*;%20!*_chase;%20!OH5BZR*
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[22:04] <Bernd_DL1XH> SA6BSS-Mike: yeah thanks - the initial idea was to go up north, but you how it is with the weather forecast :-)
[22:07] <Bernd_DL1XH> you know how ...
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[22:33] <SpacenearUS> New vehicle on the map: 03Sp6vxj_chase - 12https://tracker.habhub.org/#!qm=All&q=Sp6vxj_chase
[22:45] <SA6BSS-Mike> yep :) anyway looks like I better start the radio before I get to bed
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[23:05] <Bernd_DL1XH> that ll be great! :-) tnx
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[23:50] <SpacenearUS> New position from 03N4XWC-1 after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=N4XWC-1
[23:57] <happysat> Wetterson.de wird zum 1.3.2021 den Betrieb einstellen.
[23:57] <happysat> Vielen Dank an alle, die uns in den vergangenen 5 Jahren unterstützt haben
[23:57] <happysat> Wetterson.de will cease operations on March 1, 2021.
[23:57] <happysat> Thank you to everyone who has supported us over the past 5 years
[00:00] --- Wed Jan 13 2021