On 11-04-09 02:30 AM, lai...@wcoil.com wrote:
The very popular Zenith Transocienanic short wave radios use a 90 volt battery and draw around 11-20 milliamps. The A battery filament supply is 9 volts at 50-60 miliamps. Many of the very compact portable tube radios would use 1.5 or 3 volts for the filament supply and 67.5 or 90volts for the B supply. It would be very handy to wire the supply with a sense circuit that would detect when the filament supply was turned on. I would think that mounting the switcher in a metal enclosure with input and output leads properly bypassed would take care of the RF noise problem. Ferrite beads, inductors, bypass capacitors. I just wanted to throw this out.
THe Transoceanic is a short wave receiver, so Any noise in the 1500Khz to 30 Mhz band would defeat the purpose. ALSO the TO uses a Tube even rarer than the 15 segment Nixies, the 1L6, so IRON CLAD regulation of the filament circuit is a must.
-- Charles MacDonald Stittsville Ontario cm...@zeusprune.ca Just Beyond the Fringe http://www.TelecomOttawa.net/~cmacd/ No Microsoft Products were used in sending this e-mail. -- 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.
