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two switcher circuits

Started by Unknown April 3, 2020

https://www.dropbox.com/s/keynlhs9ktzivyh/LTM8078_dual_neg_1.asc?dl=0

https://www.dropbox.com/s/htzvrbnd8qx3ooi/LTM8078_plus_minus_1.asc?dl=0







-- 

John Larkin         Highland Technology, Inc

Science teaches us to doubt.

  Claude Bernard
  
On 2020-04-03 10:34, jlarkin@highlandsniptechnology.com wrote:
> > > https://www.dropbox.com/s/keynlhs9ktzivyh/LTM8078_dual_neg_1.asc?dl=0 > > https://www.dropbox.com/s/htzvrbnd8qx3ooi/LTM8078_plus_minus_1.asc?dl=0
Cute. Sure is going to need some input filtering though! Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
On Fri, 3 Apr 2020 11:09:33 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>On 2020-04-03 10:34, jlarkin@highlandsniptechnology.com wrote: >> >> >> https://www.dropbox.com/s/keynlhs9ktzivyh/LTM8078_dual_neg_1.asc?dl=0 >> >> https://www.dropbox.com/s/htzvrbnd8qx3ooi/LTM8078_plus_minus_1.asc?dl=0 > > >Cute. Sure is going to need some input filtering though! > >Cheers > >Phil Hobbs
I have to resist the temptation to put bypass caps across voltage sources in Spice. The LTM8078 apparently has inductors but no caps. Even that is impressive. Can anybody x-ray one for me? https://www.dropbox.com/s/b6dogwrwioka5nj/LTMs_Top.jpg?raw=1 https://www.dropbox.com/s/m1u04ne0w575ykl/LTMs_Bot.jpg?raw=1 -- John Larkin Highland Technology, Inc Science teaches us to doubt. Claude Bernard
On 4/3/2020 10:34 AM, jlarkin@highlandsniptechnology.com wrote:
> > > https://www.dropbox.com/s/keynlhs9ktzivyh/LTM8078_dual_neg_1.asc?dl=0 > > https://www.dropbox.com/s/htzvrbnd8qx3ooi/LTM8078_plus_minus_1.asc?dl=0 > > > > > > >
Not a switcher, but expedient: <https://www.dropbox.com/s/uf29ubm0v1ox7pv/linear_tracking.PNG?dl=0>
On Fri, 3 Apr 2020 13:31:31 -0400, bitrex <user@example.net> wrote:

>On 4/3/2020 10:34 AM, jlarkin@highlandsniptechnology.com wrote: >> >> >> https://www.dropbox.com/s/keynlhs9ktzivyh/LTM8078_dual_neg_1.asc?dl=0 >> >> https://www.dropbox.com/s/htzvrbnd8qx3ooi/LTM8078_plus_minus_1.asc?dl=0 >> >> >> >> >> >> >> > >Not a switcher, but expedient: > ><https://www.dropbox.com/s/uf29ubm0v1ox7pv/linear_tracking.PNG?dl=0> >
Driving the adj pin of a 3t regulator is an under-appreciated trick. They are nice, cheap, thermally limited power amps. We have standardized on 24 volt warts for small boxes, so we want to switch mostly. So multiple outputs from tiny switchers is good. Just minutes ago I got this: https://www.dropbox.com/s/wxerjg36c3ow8s5/J744_3.jpg?dl=0 https://www.dropbox.com/s/lnn1jwk7gm1h713/J744_2.jpg?dl=0 The idea is to get away from the boring Hammond boxes. This is a semi-custom extrusion with nice grounding and thermals. We plan to laser blast the anodize for external artwork. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
On Fri, 03 Apr 2020 11:48:20 -0700, John Larkin wrote:

> On Fri, 3 Apr 2020 13:31:31 -0400, bitrex <user@example.net> wrote: > >>On 4/3/2020 10:34 AM, jlarkin@highlandsniptechnology.com wrote: >>> >>> >>> https://www.dropbox.com/s/keynlhs9ktzivyh/LTM8078_dual_neg_1.asc?dl=0 >>> >>> https://www.dropbox.com/s/htzvrbnd8qx3ooi/LTM8078_plus_minus_1.asc?
dl=0
>>> >>> >>> >>> >>> >>> >>> >>> >>Not a switcher, but expedient: >> >><https://www.dropbox.com/s/uf29ubm0v1ox7pv/linear_tracking.PNG?dl=0> >> >> > Driving the adj pin of a 3t regulator is an under-appreciated trick. > They are nice, cheap, thermally limited power amps. > > We have standardized on 24 volt warts for small boxes, so we want to > switch mostly. So multiple outputs from tiny switchers is good. > > Just minutes ago I got this: > > https://www.dropbox.com/s/wxerjg36c3ow8s5/J744_3.jpg?dl=0 > > https://www.dropbox.com/s/lnn1jwk7gm1h713/J744_2.jpg?dl=0 > > The idea is to get away from the boring Hammond boxes. This is a > semi-custom extrusion with nice grounding and thermals. We plan to laser > blast the anodize for external artwork.
Who made those boxes for you? I have an upcoming project where I need something similar. -- Chisolm Texas-American
On Fri, 03 Apr 2020 14:10:06 -0500, Joe Chisolm
<jchisolm6@earthlink.net> wrote:

>On Fri, 03 Apr 2020 11:48:20 -0700, John Larkin wrote: > >> On Fri, 3 Apr 2020 13:31:31 -0400, bitrex <user@example.net> wrote: >> >>>On 4/3/2020 10:34 AM, jlarkin@highlandsniptechnology.com wrote: >>>> >>>> >>>> https://www.dropbox.com/s/keynlhs9ktzivyh/LTM8078_dual_neg_1.asc?dl=0 >>>> >>>> https://www.dropbox.com/s/htzvrbnd8qx3ooi/LTM8078_plus_minus_1.asc? >dl=0 >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>Not a switcher, but expedient: >>> >>><https://www.dropbox.com/s/uf29ubm0v1ox7pv/linear_tracking.PNG?dl=0> >>> >>> >> Driving the adj pin of a 3t regulator is an under-appreciated trick. >> They are nice, cheap, thermally limited power amps. >> >> We have standardized on 24 volt warts for small boxes, so we want to >> switch mostly. So multiple outputs from tiny switchers is good. >> >> Just minutes ago I got this: >> >> https://www.dropbox.com/s/wxerjg36c3ow8s5/J744_3.jpg?dl=0 >> >> https://www.dropbox.com/s/lnn1jwk7gm1h713/J744_2.jpg?dl=0 >> >> The idea is to get away from the boring Hammond boxes. This is a >> semi-custom extrusion with nice grounding and thermals. We plan to laser >> blast the anodize for external artwork. > >Who made those boxes for you? I have an upcoming project where I >need something similar.
https://www.pumay-aluminum.com/products/ They cut one of their extrusions to length and machined it per our drawing. The blue anodize color is a little garish, so we'll ask them to tone it down a bit next time. The holes are drilled/tapped after anodize, so are conductive and don't have the problems that the self-tappers do on the Hammond boxes. Like metal shavings everywhere and stripped screws. We add a couple of metal bars inside that the board bolts to. https://www.dropbox.com/s/1fglmrtg3l9pkf8/J002_1.jpg?raw=1 -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
On 4/3/2020 2:48 PM, John Larkin wrote:
> On Fri, 3 Apr 2020 13:31:31 -0400, bitrex <user@example.net> wrote: > >> On 4/3/2020 10:34 AM, jlarkin@highlandsniptechnology.com wrote: >>> >>> >>> https://www.dropbox.com/s/keynlhs9ktzivyh/LTM8078_dual_neg_1.asc?dl=0 >>> >>> https://www.dropbox.com/s/htzvrbnd8qx3ooi/LTM8078_plus_minus_1.asc?dl=0 >>> >>> >>> >>> >>> >>> >>> >> >> Not a switcher, but expedient: >> >> <https://www.dropbox.com/s/uf29ubm0v1ox7pv/linear_tracking.PNG?dl=0> >> > > Driving the adj pin of a 3t regulator is an under-appreciated trick. > They are nice, cheap, thermally limited power amps.
I noticed that the LM317 is OK with its input sitting about 4-5" from the +/-50 switcher output filter caps, but without some extra filtering closer to the regulator the LM337 is unhappy about it and starts oscillating at low frequency
> We have standardized on 24 volt warts for small boxes, so we want to > switch mostly. So multiple outputs from tiny switchers is good. > > Just minutes ago I got this: > > https://www.dropbox.com/s/wxerjg36c3ow8s5/J744_3.jpg?dl=0 > > https://www.dropbox.com/s/lnn1jwk7gm1h713/J744_2.jpg?dl=0 > > The idea is to get away from the boring Hammond boxes. This is a > semi-custom extrusion with nice grounding and thermals. We plan to > laser blast the anodize for external artwork. >
Hammond makes some nice transformers at reasonable prices for e.g. vacuum tube amps but their enclosures sure are drab!
On 2020-04-03 14:48, John Larkin wrote:
> On Fri, 3 Apr 2020 13:31:31 -0400, bitrex <user@example.net> wrote: > >> On 4/3/2020 10:34 AM, jlarkin@highlandsniptechnology.com wrote: >>> >>> >>> https://www.dropbox.com/s/keynlhs9ktzivyh/LTM8078_dual_neg_1.asc?dl=0 >>> >>> https://www.dropbox.com/s/htzvrbnd8qx3ooi/LTM8078_plus_minus_1.asc?dl=0 >>> >>> >>> >>> >>> >>> >>> >> >> Not a switcher, but expedient: >> >> <https://www.dropbox.com/s/uf29ubm0v1ox7pv/linear_tracking.PNG?dl=0> >> > > Driving the adj pin of a 3t regulator is an under-appreciated trick. > They are nice, cheap, thermally limited power amps. > > We have standardized on 24 volt warts for small boxes, so we want to > switch mostly. So multiple outputs from tiny switchers is good. > > Just minutes ago I got this: > > https://www.dropbox.com/s/wxerjg36c3ow8s5/J744_3.jpg?dl=0 > > https://www.dropbox.com/s/lnn1jwk7gm1h713/J744_2.jpg?dl=0
My eyes! My eyes!
> > The idea is to get away from the boring Hammond boxes. This is a > semi-custom extrusion with nice grounding and thermals. We plan to > laser blast the anodize for external artwork.
Yeah, it would be good to get them to tone it down a bit. ;) Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
On Friday, April 3, 2020 at 5:55:02 PM UTC-4, Phil Hobbs wrote:
> On 2020-04-03 14:48, John Larkin wrote: > > On Fri, 3 Apr 2020 13:31:31 -0400, bitrex <user@example.net> wrote: > > > >> On 4/3/2020 10:34 AM, jlarkin@highlandsniptechnology.com wrote: > >>> > >>> > >>> https://www.dropbox.com/s/keynlhs9ktzivyh/LTM8078_dual_neg_1.asc?dl=0 > >>> > >>> https://www.dropbox.com/s/htzvrbnd8qx3ooi/LTM8078_plus_minus_1.asc?dl=0 > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >> > >> Not a switcher, but expedient: > >> > >> <https://www.dropbox.com/s/uf29ubm0v1ox7pv/linear_tracking.PNG?dl=0> > >> > > > > Driving the adj pin of a 3t regulator is an under-appreciated trick. > > They are nice, cheap, thermally limited power amps. > > > > We have standardized on 24 volt warts for small boxes, so we want to > > switch mostly. So multiple outputs from tiny switchers is good. > > > > Just minutes ago I got this: > > > > https://www.dropbox.com/s/wxerjg36c3ow8s5/J744_3.jpg?dl=0 > > > > https://www.dropbox.com/s/lnn1jwk7gm1h713/J744_2.jpg?dl=0 > > My eyes! My eyes! > > > > The idea is to get away from the boring Hammond boxes. This is a > > semi-custom extrusion with nice grounding and thermals. We plan to > > laser blast the anodize for external artwork. > > Yeah, it would be good to get them to tone it down a bit. ;)
What part number is this? What color specification? -- Rick C. - Get 1,000 miles of free Supercharging - Tesla referral code - https://ts.la/richard11209