Smoothing the full wave rectified AC gets you close to √2 times the RMS AC voltage. In this case it'd be about 320 VDC. I think the point Paul was making was that you don't need to smooth the rectified AC, and instead just drive the tubes using the pulsed DC. fredag den 16. oktober 2020 kl. 06.28.36 UTC+2 skrev Richard Scales:
> OK, I think I'm getting there - I now understand that in the UK, mains > voltage is 230V RMS - I had assumed that the quoted value of 230V was a > peak value - shame on me (brain is not what it was 40 years ago when I > learnt all that stuff). > > Given that UK mains is around that value - are we saying that full wave > rectifying that and smoothing it is pretty much all we need? > > ... and if so, a suitable isolation transformer should be employed for > safety/sanity. > > ... and a suitably sized electrolytic for smoothing. > > - Richard > > > > On Thursday, 15 October 2020 21:30:15 UTC+1, Paul Andrews wrote: > >> You don’t need DC to drive these things. Full wave rectified will do. >> Also, you want the average rectified value to be 240V. Rectifying 170V RMS >> won’t give you that. Smoothing it will get you closer. So I think you >> should just use 240V RMS full wave rectified. >> >> On Oct 15, 2020, at 11:42 AM, gregebert <[email protected]> wrote: >> >> You could use a voltage-doubler. That will solve the voltage problem but >> it will double the current. Is the VA rating of the transformer sufficient >> for your project ? >> >> >> On Thursday, October 15, 2020 at 7:50:22 AM UTC-7 Richard Scales wrote: >> >>> On the whole isolation transformer thing - I've been trying to find >>> something with 170V secondary with enough VA (for 6 displays) and have >>> failed thus far. >>> >>> An alternative approach might be to take off the shelf toroidal >>> transformers - like mains to 35V then 45 V to mains - two transformers back >>> to back. Standard parts, lower cost, plenty VA. >>> >>> - Richard >>> >>> >>> On Sunday, 2 August 2020 01:47:39 UTC+1, celzey11 wrote: >>>> >>>> >>>> https://www.ebay.com/itm/PCB-with-23-pieces-IN-28-nixie-tubes-slightly-used-working/114333271792?_trkparms=aid%3D1110002%26algo%3DSPLICE.SOI%26ao%3D1%26asc%3D20190711095549%26meid%3D77ba7a42f3f24b709ebe632fb079b086%26pid%3D100047%26rk%3D5%26rkt%3D12%26sd%3D112419561527%26itm%3D114333271792%26pmt%3D1%26noa%3D1%26pg%3D2047675%26algv%3DSellersOtherItemsV2&_trksid=p2047675.c100047.m2108&autorefresh=true >>>> >>> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "neonixie-l" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/neonixie-l/bVoCKhPv7Dg/unsubscribe. >> >> To unsubscribe from this group and all its topics, send an email to >> [email protected]. >> >> >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/77e9c049-01d9-4386-b736-3dd337823550n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/neonixie-l/77e9c049-01d9-4386-b736-3dd337823550n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> >> -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/19af5b98-e7e9-4f54-a160-4aec77ab7205n%40googlegroups.com.
