Paul, you are probably using a linear regulator, which is inefficient by design (it reduces the voltage by burning the difference as heat. Andries, sounds to me like your external 5V regulator is unstable.
On Thu, Jan 15, 2015 at 6:03 AM, Paul McMahon <[email protected]> wrote: > Yes, I was surprised I blew it when using a bench supply, which should be > very well behaved (it's a good supply). > I should add that the cigarette adapter I use is sadly inefficient, even > when dropping from 12 to 7-8V. The regulator on that board gets so hot you > can't even really touch it for more than a half second. I measured it with > an IR thermometer at around 70C. I guess that's what you get for $1. > Still, it's fine by me. > > > On Thu, Jan 15, 2015 at 8:57 AM, Andries Kruger <[email protected]> > wrote: > >> That sounds like a very simple suggestion Paul. I am actually going to >> power my IOIO from a 24V supply, so I have an Orion 24/12-5A DC-DC >> converter to take me down from 24 to 12. The converter is supposed to >> handle transients very well, especially transients from vehicles. My VREG >> blew when I hooked it up to the DC-DC converter running from a 24V bench. >> So I was really surprised when the VREG didn't survive as I expected a very >> clean output. >> >> On Thursday, 15 January 2015 14:10:25 UTC+2, Paul McMahon wrote: >>> >>> I, too, fried a Vreg a while ago, and have a 12V application. I was >>> using a bench supply at the time. >>> I decided to use a cigarette lighter USB charger circuit board in front >>> of the ioio vin terminal, $1, and no issues since (at least 100 cycles). >>> The board is very small, too. >>> I made a slight tweak to the charger board, though not really necessary: >>> I adjusted the voltage setpoint resistor to get an output voltage of 7-8 >>> volts. To give some headroom over the phone's charging circuit. >> >> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "ioio-users" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/ioio-users/FHjcCbAM2Ig/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at http://groups.google.com/group/ioio-users. >> For more options, visit https://groups.google.com/d/optout. >> > > -- > You received this message because you are subscribed to the Google Groups > "ioio-users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/ioio-users. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "ioio-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/ioio-users. For more options, visit https://groups.google.com/d/optout.
