Re: [neonixie-l] 555 power supply not working
In Denmark, you can buy from RS being a private customer, but you need to do it online if is't not in stock locally. We have a local warehouse in Copenhagen, and if it's in stock there you can pick it up at the counter and pay by cash, but if it's not in stock, you'll have to order it online and pay for shipping to your home address. // Per. On 25/11/2011, at 23.25, Tidak Ada wrote: > RS unfortunately stopped selling to private customers > > eric > > -Original Message- > From: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] On > Behalf Of John Rehwinkel > Sent: vrijdag 25 november 2011 22:13 > To: neonixie-l@googlegroups.com > Subject: Re: [neonixie-l] Re: 555 power supply not working > >> And just one question. I checked the shipping prices from Mouser and >> Digi-key. They were both between $100 and $120 for a single item. Is >> it always like this (I am in Europe). > > In Europe, you'd likely do better ordering from RS, Farnell, or even Jaycar > or Futurlec. > > - John > >> >> -- >> You received this message because you are subscribed to the Google Groups > "neonixie-l" group. >> To post to this group, send an email to neonixie-l@googlegroups.com. >> To unsubscribe from this group, send email to > neonixie-l+unsubscr...@googlegroups.com. >> For more options, visit this group at > http://groups.google.com/group/neonixie-l?hl=en-GB. >> > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To post to this group, send an email to neonixie-l@googlegroups.com. > To unsubscribe from this group, send email to > neonixie-l+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/neonixie-l?hl=en-GB. > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To post to this group, send an email to neonixie-l@googlegroups.com. > To unsubscribe from this group, send email to > neonixie-l+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/neonixie-l?hl=en-GB. > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
Re: [neonixie-l] 555 power supply not working
I've made up dozens of these supplies in all kinds of layout configurations and have found them to be bomb-proof. In fact I have never had a failure yet, they work every time. The circuit will work without the snubber R6/C3. There must be some simple answer to your problem. It seems to me as if the 555 might not be doing any switching, or doing it incorrectly. Or as you say the FET is not all it's cracked up to be, or the diode is not fast enough. Check the value and rating of your inductor. The FET should not get too hot. Usually it will run cool enough for you to hold it. John S On 18 Nov 2011, at 19:43, Imbanon wrote: Hi all. Yeah, another thread about this supply.. http://www.ledsales.com.au/ kits/nixie_supply.pdf I know I could and should have made that Maxim power supply, but I didn't. So now I'm stuck fixing this with loads of spare parts I've got... except for the FETs.. Anyways, the supply isn't working. The first one I made worked just fine for 15 minutes, powering 6 IN-14 at 170 volts (multiplexed). Then I set it to 200 volts (to get RMS of 2mA), which worked for 5 minutes, and then smoked and failed. I made another on a quick PCB, which just smoked immediately when I switched it on. The same thing happened to the newest, breadboarded one. The MOSFET seems to overheat instantly and smoke out. Having nothing to lose (except the molten hole in the breadboard), I left it powered, to see the diode smoking next. Aparently, its still in working order (so says the multimeter). Heat sinking FET only makes it last longer in not working state before it smokes. I tried replacing inductors, 555s, diodes, transistors.. What the F**K do I do people? Losing my head here! And yeah, I'm powering it at 12 volts, tried 5. Output is always 3-6 volts. Thank you for any help provided! Imbanon -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l +unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/ group/neonixie-l?hl=en-GB.  JS Design 54 Brambledown Road Wallington Surrey SM6 0TF T+F +44 (0)20 8773 4779 www.jsdesign.co.uk -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB. <>
Re: [neonixie-l] 555 power supply not working
Which kind of FET and Diode are you using ? Do you have around 100nF of decoupling directly across the power pins of the 555 ? Gimme a link to the shematic you used. // Per. On 18/11/2011, at 20.43, Imbanon wrote: > Hi all. > > Yeah, another thread about this supply.. > http://www.ledsales.com.au/kits/nixie_supply.pdf > I know I could and should have made that Maxim power supply, but I > didn't. So now I'm stuck fixing this with loads of spare parts I've > got... except for the FETs.. > > Anyways, the supply isn't working. The first one I made worked just > fine for 15 minutes, powering 6 IN-14 at 170 volts (multiplexed). Then > I set it to 200 volts (to get RMS of 2mA), which worked for 5 minutes, > and then smoked and failed. > I made another on a quick PCB, which just smoked immediately when I > switched it on. The same thing happened to the newest, breadboarded > one. > The MOSFET seems to overheat instantly and smoke out. Having nothing > to lose (except the molten hole in the breadboard), I left it powered, > to see the diode smoking next. Aparently, its still in working order > (so says the multimeter). > Heat sinking FET only makes it last longer in not working state before > it smokes. > > I tried replacing inductors, 555s, diodes, transistors.. > What the F**K do I do people? Losing my head here! > > And yeah, I'm powering it at 12 volts, tried 5. Output is always 3-6 > volts. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
