Seems like efficiency is not its main strength, considering the BJT switch... But hey, if it works... On Jan 15, 2015 6:29 PM, "Paul McMahon" <[email protected]> wrote:
> No, it's using the MC34063A switching regulator. I'm an EE--so was > thinking linear as well, but it's not. > > > > On Thu, Jan 15, 2015 at 9:21 PM, Ytai Ben-Tsvi <[email protected]> wrote: > >> 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 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.
