mandag den 6. februar 2023 kl. 16.27.11 UTC+1 skrev John Larkin:> On Sun, 5 Feb 2023 21:11:11 -0800 (PST), Phil Allison > <palli...@gmail.com> wrote: > > >John Larkin wrote: > > > >------------------------------ > >> https://www.dropbox.com/s/e6okuzog0nulvjm/Rail_Splitter_B.jpg?raw=1 > > > > > >** Using a AC ( transformer) wall wart has a few notable advantages it you are going to use linear regs. > > > >One with a single 12 volt secondary will supply +/- 16VDC or so using a ( 2 cap, 2 diode) voltage doubler. > >Highly reliable, no SMPS noise, very safe mains isolation. > > > > > >.... Phil > Ac warts aren't common any more. We do try to design units that will > work, or at least not blow up, when someone grabs the wrong cord off > the tangle on the bench and plugs it into our box. > > +24DC is our default input. A box might not work at 12, but at least > won't blow up. Warts above 24 are uncommon.48V is beginning to show up for POE
Rail-splitting a wall wart
Started by ●February 3, 2023
Reply by ●February 6, 20232023-02-06
Reply by ●February 6, 20232023-02-06
John Larkin wrote: ------------------------------> > >** Using a AC ( transformer) wall wart has a few notable advantages it you are going to use linear regs. > > > >One with a single 12 volt secondary will supply +/- 16VDC or so using a ( 2 cap, 2 diode) voltage doubler. > >Highly reliable, no SMPS noise, very safe mains isolation. > > > > > >.... Phil> Ac warts aren't common any more.** Neverthless are readily available.>We do try to design units that will > work, or at least not blow up, when someone grabs the wrong cord off > the tangle on the bench and plugs it into our box.** The common, flimsy, co-axial DC plug is polarised in name only - wart maker wires them either way at whim. IMO they should not be seen on prefessional equipment. This threaded locking connector is very sturdy and comes in 2, 3 and 4 pin. https://www.altronics.com.au/p/p0948-2-pin-female-line-microphone-connector/ .... Phil
Reply by ●February 6, 20232023-02-06
On Mon, 6 Feb 2023 12:19:30 -0800 (PST), Lasse Langwadt Christensen <langwadt@fonz.dk> wrote:>mandag den 6. februar 2023 kl. 16.27.11 UTC+1 skrev John Larkin: >> On Sun, 5 Feb 2023 21:11:11 -0800 (PST), Phil Allison >> <palli...@gmail.com> wrote: >> >> >John Larkin wrote: >> > >> >------------------------------ >> >> https://www.dropbox.com/s/e6okuzog0nulvjm/Rail_Splitter_B.jpg?raw=1 >> > >> > >> >** Using a AC ( transformer) wall wart has a few notable advantages it you are going to use linear regs. >> > >> >One with a single 12 volt secondary will supply +/- 16VDC or so using a ( 2 cap, 2 diode) voltage doubler. >> >Highly reliable, no SMPS noise, very safe mains isolation. >> > >> > >> >.... Phil >> Ac warts aren't common any more. We do try to design units that will >> work, or at least not blow up, when someone grabs the wrong cord off >> the tangle on the bench and plugs it into our box. >> >> +24DC is our default input. A box might not work at 12, but at least >> won't blow up. Warts above 24 are uncommon. > >48V is beginning to show up for POEIn the US, the limit will be the NEC (National Electrical Code), which defines the max voltage for a low-voltage system that does not need to all the stuff needed to handle mains power (125, 240, 300 Volts). There will be a European equivalent to the NEC, likely coordinated as much of this stuff is used worldwide. Joe Gwinn
Reply by ●February 6, 20232023-02-06
On Mon, 6 Feb 2023 13:27:03 -0800 (PST), Phil Allison <pallison49@gmail.com> wrote:>John Larkin wrote: >------------------------------ >> >> >** Using a AC ( transformer) wall wart has a few notable advantages it you are going to use linear regs. >> > >> >One with a single 12 volt secondary will supply +/- 16VDC or so using a ( 2 cap, 2 diode) voltage doubler. >> >Highly reliable, no SMPS noise, very safe mains isolation. >> > >> > >> >.... Phil > >> Ac warts aren't common any more. > >** Neverthless are readily available. > >>We do try to design units that will >> work, or at least not blow up, when someone grabs the wrong cord off >> the tangle on the bench and plugs it into our box. > >** The common, flimsy, co-axial DC plug is polarised in name only - wart maker wires them either way at whim. > IMO they should not be seen on prefessional equipment.We use a lot of Phihong warts and somebody elses' 24 and 48 volt laptop type supplies. I'm not aware of any being polarized wrong. The barrel connectors are fine, given a good PC mount mate. We usually buy the wart with a screw-locking connector and our PCB end accepts plain or screw.> > This threaded locking connector is very sturdy and comes in 2, 3 and 4 pin. > > https://www.altronics.com.au/p/p0948-2-pin-female-line-microphone-connector/ > >.... PhilCan you buy warts with that connector?
Reply by ●February 6, 20232023-02-06
mandag den 6. februar 2023 kl. 23.46.45 UTC+1 skrev John Larkin:> On Mon, 6 Feb 2023 13:27:03 -0800 (PST), Phil Allison > <palli...@gmail.com> wrote: > > >John Larkin wrote: > >------------------------------ > >> > >> >** Using a AC ( transformer) wall wart has a few notable advantages it you are going to use linear regs. > >> > > >> >One with a single 12 volt secondary will supply +/- 16VDC or so using a ( 2 cap, 2 diode) voltage doubler. > >> >Highly reliable, no SMPS noise, very safe mains isolation. > >> > > >> > > >> >.... Phil > > > >> Ac warts aren't common any more. > > > >** Neverthless are readily available. > > > >>We do try to design units that will > >> work, or at least not blow up, when someone grabs the wrong cord off > >> the tangle on the bench and plugs it into our box. > > > >** The common, flimsy, co-axial DC plug is polarised in name only - wart maker wires them either way at whim. > > IMO they should not be seen on prefessional equipment. > We use a lot of Phihong warts and somebody elses' 24 and 48 volt > laptop type supplies. I'm not aware of any being polarized wrong. > > The barrel connectors are fine, given a good PC mount mate. We usually > buy the wart with a screw-locking connector and our PCB end accepts > plain or screw. > > > > This threaded locking connector is very sturdy and comes in 2, 3 and 4 pin. > > > > https://www.altronics.com.au/p/p0948-2-pin-female-line-microphone-connector/ > > > >.... Phil > Can you buy warts with that connector?doubt it for a bit more power and locking you can get 24V/10A with a 6 pin mini-fit jr.
Reply by ●February 6, 20232023-02-06
John Larkin wrote: Phil Allison> > >John Larkin wrote: > >------------------------------ > >> > >> >** Using a AC ( transformer) wall wart has a few notable advantages it you are going to use linear regs. > >> > > >> >One with a single 12 volt secondary will supply +/- 16VDC or so using a ( 2 cap, 2 diode) voltage doubler. > >> >Highly reliable, no SMPS noise, very safe mains isolation. > >> > > >> > > >> >.... Phil > > > >> Ac warts aren't common any more. > > > >** Neverthless are readily available. > > > >>We do try to design units that will > >> work, or at least not blow up, when someone grabs the wrong cord off > >> the tangle on the bench and plugs it into our box. > > > >** The common, flimsy, co-axial DC plug is polarised in name only - wart maker wires them either way at whim. > > IMO they should not be seen on professional equipment.> We use a lot of Phihong warts and somebody elses' 24 and 48 volt > laptop type supplies. I'm not aware of any being polarized wrong.** HUH ?? There is no such thing as " wrong" polarity when DC plugs are fitted to leads. Some are positive tip and the rest negative. Wot planet do you live on ?> > > > This threaded locking connector is very sturdy and comes in 2, 3 and 4 pin. > > > > https://www.altronics.com.au/p/p0948-2-pin-female-line-microphone-connector/ > > > >.... Phil> Can you buy warts with that connector?** So you actually design things for a living ? ..... Phil
Reply by ●February 6, 20232023-02-06
On Mon, 6 Feb 2023 15:28:31 -0800 (PST), Phil Allison <pallison49@gmail.com> wrote:> John Larkin wrote: > Phil Allison > >> >> >John Larkin wrote: >> >------------------------------ >> >> >> >> >** Using a AC ( transformer) wall wart has a few notable advantages it you are going to use linear regs. >> >> > >> >> >One with a single 12 volt secondary will supply +/- 16VDC or so using a ( 2 cap, 2 diode) voltage doubler. >> >> >Highly reliable, no SMPS noise, very safe mains isolation. >> >> > >> >> > >> >> >.... Phil >> > >> >> Ac warts aren't common any more. >> > >> >** Neverthless are readily available. >> > >> >>We do try to design units that will >> >> work, or at least not blow up, when someone grabs the wrong cord off >> >> the tangle on the bench and plugs it into our box. >> > >> >** The common, flimsy, co-axial DC plug is polarised in name only - wart maker wires them either way at whim. >> > IMO they should not be seen on professional equipment. > >> We use a lot of Phihong warts and somebody elses' 24 and 48 volt >> laptop type supplies. I'm not aware of any being polarized wrong. > >** HUH ?? > There is no such thing as " wrong" polarity when DC plugs are fitted to leads. > Some are positive tip and the rest negative. > Wot planet do you live on ?We buy DC warts that have the inner part of the barrel connector positive. Negative would certainly be wrong. We also sell a cable as an accessory, a zip cord type thing, pigtail on one end and barrel on the other, for people who have their own 24 volt bus. We assume they will wire it right, and they seem to. We do usually tolerate reverse polarity without damage, a polyfuse and a TVS. http://www.highlandtechnology.com/categories/accessories.shtml#J27> >> > >> > This threaded locking connector is very sturdy and comes in 2, 3 and 4 pin. >> > >> > https://www.altronics.com.au/p/p0948-2-pin-female-line-microphone-connector/ >> > >> >.... Phil > >> Can you buy warts with that connector? > > ** So you actually design things for a living ?Sell them too. Can you buy warts with that connector?
Reply by ●February 6, 20232023-02-06
John Larkin trolling idiot wrote: ------------------------------> >> >> > >> >> >** Using a AC ( transformer) wall wart has a few notable advantages it you are going to use linear regs. > >> >> > > >> >> >One with a single 12 volt secondary will supply +/- 16VDC or so using a ( 2 cap, 2 diode) voltage doubler. > >> >> >Highly reliable, no SMPS noise, very safe mains isolation. > >> >> > > >> >> > > >> >> >.... Phil > >> > > >> >> Ac warts aren't common any more. > >> > > >> >** Neverthless are readily available. > >> > > >> >>We do try to design units that will > >> >> work, or at least not blow up, when someone grabs the wrong cord off > >> >> the tangle on the bench and plugs it into our box. > >> > > >> >** The common, flimsy, co-axial DC plug is polarised in name only - wart maker wires them either way at whim. > >> > IMO they should not be seen on professional equipment. > > > >> We use a lot of Phihong warts and somebody elses' 24 and 48 volt > >> laptop type supplies. I'm not aware of any being polarized wrong. > > > >** HUH ?? > > There is no such thing as " wrong" polarity when DC plugs are fitted to leads. > > Some are positive tip and the rest negative. > > Wot planet do you live on ? > > We buy DC warts that have the inner part of the barrel connector > positive.** Really, no fooling - so fucking wot ????> We also sell a cable as an accessory, a zip cord type thing, pigtail > on one end and barrel on the other, for people who have their own 24 > volt bus. We assume they will wire it right, and they seem to. We do > usually tolerate reverse polarity without damage, a polyfuse and a > TVS. > > http://www.highlandtechnology.com/categories/accessories.shtml#J27 > > > >> > > >> > This threaded locking connector is very sturdy and comes in 2, 3 and 4 pin. > >> > > >> > https://www.altronics.com.au/p/p0948-2-pin-female-line-microphone-connector/ > >> > > >> >.... Phil > > > >> Can you buy warts with that connector? > > > > ** So you actually design things for a living ? > > Sell them too.** Amasing how you know so little.
Reply by ●February 6, 20232023-02-06
On Mon, 6 Feb 2023 15:43:43 -0800 (PST), Phil Allison <pallison49@gmail.com> wrote:> >John Larkin trolling idiot wrote: >------------------------------ >> >> >> >> >> >> >** Using a AC ( transformer) wall wart has a few notable advantages it you are going to use linear regs. >> >> >> > >> >> >> >One with a single 12 volt secondary will supply +/- 16VDC or so using a ( 2 cap, 2 diode) voltage doubler. >> >> >> >Highly reliable, no SMPS noise, very safe mains isolation. >> >> >> > >> >> >> > >> >> >> >.... Phil >> >> > >> >> >> Ac warts aren't common any more. >> >> > >> >> >** Neverthless are readily available. >> >> > >> >> >>We do try to design units that will >> >> >> work, or at least not blow up, when someone grabs the wrong cord off >> >> >> the tangle on the bench and plugs it into our box. >> >> > >> >> >** The common, flimsy, co-axial DC plug is polarised in name only - wart maker wires them either way at whim. >> >> > IMO they should not be seen on professional equipment. >> > >> >> We use a lot of Phihong warts and somebody elses' 24 and 48 volt >> >> laptop type supplies. I'm not aware of any being polarized wrong. >> > >> >** HUH ?? >> > There is no such thing as " wrong" polarity when DC plugs are fitted to leads. >> > Some are positive tip and the rest negative. >> > Wot planet do you live on ? >> >> We buy DC warts that have the inner part of the barrel connector >> positive. > > ** Really, no fooling - so fucking wot ???? > > > >> We also sell a cable as an accessory, a zip cord type thing, pigtail >> on one end and barrel on the other, for people who have their own 24 >> volt bus. We assume they will wire it right, and they seem to. We do >> usually tolerate reverse polarity without damage, a polyfuse and a >> TVS. >> >> http://www.highlandtechnology.com/categories/accessories.shtml#J27 >> > >> >> > >> >> > This threaded locking connector is very sturdy and comes in 2, 3 and 4 pin. >> >> > >> >> > https://www.altronics.com.au/p/p0948-2-pin-female-line-microphone-connector/ >> >> > >> >> >.... Phil >> > >> >> Can you buy warts with that connector? >> > >> > ** So you actually design things for a living ? >> >> Sell them too. > >** Amasing how you know so little. > >My customers must be even dumber. Can you buy warts with that connector?
Reply by ●February 6, 20232023-02-06
On Monday, February 6, 2023 at 3:38:45 PM UTC-8, John Larkin wrote:> On Mon, 6 Feb 2023 15:28:31 -0800 (PST), Phil Allison > <palli...@gmail.com> wrote:> > There is no such thing as " wrong" polarity when DC plugs are fitted to leads. > > Some are positive tip and the rest negative. > > Wot planet do you live on ?> We buy DC warts that have the inner part of the barrel connector > positive. Negative would certainly be wrong.That's a flawed certainty. Here is a counterexample; the center is negative, and it isn't just the label, my multimeter says so too. <https://photos.app.goo.gl/7RSyQpJ4NQrKzfgu5> What's really spooky, is that I recall an identical manufacturer and part number unit with center positive (also correctly labelled).
