Tek 2215 question
Every once in a while one of these comes up with a back panel singing inductor that up-the-wall whines. I tried everything reasonable involving damping the tuning fork like shield, rubber mounts, etc. Still could not get the noise acceptably low. This is apparently a chronic problem that infects a significant number of 2215's and probably 2213's as well. Any cures or workarounds out there? -- Many thanks, Don Lancaster Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552 voice: (928)428-4073 email: Please visit my GURU's LAIR web site at http://www.tinaja.com |
Tek 2215 question
AFAIK, there are no easy workarounds. As you probably are aware, Tek
came out with a retrofit kit that replaced the nasty triac prereg with a TL594 based MOSFET prereg like in the later 2215A series. Actually, the TL594 prereg is not that complex; I thought about building up a small kit myself; but I would have to come up with one part that would not be easy; the buck transformer. I have a couple of dead 2235's around here; maybe someday I'll unwind one of those to see about replicating them. Jeff On Mon, 16 Feb 2004 20:58:33 -0700, Don Lancaster wrote: Every once in a while one of these comes up with a back panel singing inductor that up-the-wall whines. I tried everything reasonable involving damping the tuning fork like shield, rubber mounts, etc. Still could not get the noise acceptably low. This is apparently a chronic problem that infects a significant number of 2215's and probably 2213's as well. Any cures or workarounds out there? |
Tek 2215 question
Don Lancaster wrote in :
Every once in a while one of these comes up with a back panel singing inductor that up-the-wall whines. I tried everything reasonable involving damping the tuning fork like shield, rubber mounts, etc. Still could not get the noise acceptably low. This is apparently a chronic problem that infects a significant number of 2215's and probably 2213's as well. Any cures or workarounds out there? Welll,the original TEK cure(mod) was to clip out the original Triac pre-reg circuitry and install a separate pre-reg PCB based on a TL494 IC.(also referred to as OPT.48) I have one of these in my 2213. TEK also tried a rubber cushion,but it didn't work. Maybe installing a different inductor would work. -- Jim Yanik jyanik-at-kua.net |
Tek 2215 question
Jeff W wrote in
: AFAIK, there are no easy workarounds. As you probably are aware, Tek came out with a retrofit kit that replaced the nasty triac prereg with a TL594 based MOSFET prereg like in the later 2215A series. Actually, the TL594 prereg is not that complex; I thought about building up a small kit myself; but I would have to come up with one part that would not be easy; the buck transformer. I have a couple of dead 2235's around here; maybe someday I'll unwind one of those to see about replicating them. Jeff On Mon, 16 Feb 2004 20:58:33 -0700, Don Lancaster wrote: Every once in a while one of these comes up with a back panel singing inductor that up-the-wall whines. I tried everything reasonable involving damping the tuning fork like shield, rubber mounts, etc. Still could not get the noise acceptably low. This is apparently a chronic problem that infects a significant number of 2215's and probably 2213's as well. Any cures or workarounds out there? Or you could create a ordinary (60Hz)transformer based 43 volt DC supply to replace the pre-reg.It would have to supply at least 1 amp at 43V,and would only work for whatever primary voltage you selected for the XFMR,not the 90-250 VAC range of the Opt.48 pre-reg. -- Jim Yanik jyanik-at-kua.net |
Tek 2215 question
Jim Yanik writes:
Jeff W wrote in : AFAIK, there are no easy workarounds. As you probably are aware, Tek came out with a retrofit kit that replaced the nasty triac prereg with a TL594 based MOSFET prereg like in the later 2215A series. Actually, the TL594 prereg is not that complex; I thought about building up a small kit myself; but I would have to come up with one part that would not be easy; the buck transformer. I have a couple of dead 2235's around here; maybe someday I'll unwind one of those to see about replicating them. Jeff On Mon, 16 Feb 2004 20:58:33 -0700, Don Lancaster wrote: Every once in a while one of these comes up with a back panel singing inductor that up-the-wall whines. I tried everything reasonable involving damping the tuning fork like shield, rubber mounts, etc. Still could not get the noise acceptably low. This is apparently a chronic problem that infects a significant number of 2215's and probably 2213's as well. Any cures or workarounds out there? Or you could create a ordinary (60Hz)transformer based 43 volt DC supply to replace the pre-reg.It would have to supply at least 1 amp at 43V,and would only work for whatever primary voltage you selected for the XFMR,not the 90-250 VAC range of the Opt.48 pre-reg. Or maybe just a commercial AC-DC 48 V brick adjusted down to 43 V or dropped to 43 V. --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html Important: The email address in this message header may no longer work. To contact me, please use the feedback form on the S.E.R FAQ Web sites. |
Tek 2215 question
I read in sci.electronics.design that Jim Yanik wrote
(in ) about 'Tek 2215 question', on Tue, 17 Feb 2004: Or you could create a ordinary (60Hz)transformer based 43 volt DC supply to replace the pre-reg.It would have to supply at least 1 amp at 43V,and would only work for whatever primary voltage you selected for the XFMR,not the 90-250 VAC range of the Opt.48 pre-reg. I have a small audio weighting filter, made by Dolby Laboratories, which has a *linear* power supply covering 80 to 250 V without adjustment. It has two small lamps in series with the transformer primary winding. But that would be one crazy panel light if you did it with a 43 W output linear supply! -- Regards, John Woodgate, OOO - Own Opinions Only. The good news is that nothing is compulsory. The bad news is that everything is prohibited. http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk |
Tek 2215 question
On a sunny day (Tue, 17 Feb 2004 15:28:22 +0000 (UTC)) it happened Jim Yanik
wrote in : Or you could create a ordinary (60Hz)transformer based 43 volt DC supply to replace the pre-reg.It would have to supply at least 1 amp at 43V,and would only work for whatever primary voltage you selected for the XFMR,not the 90-250 VAC range of the Opt.48 pre-reg. Its magnetic field might perhaps screw up the display. Plastic spray worked on line output transformers in TV, not sure it is of use here. |
Tek 2215 question
Every once in a while one of these comes up with a back panel singing
inductor that up-the-wall whines. I tried everything reasonable involving damping the tuning fork like shield, rubber mounts, etc. Have you considered active noise mitigation - bolt a voice coil to it and inject a 180-degree-out-of-phase signal to damp the vibration? :) |
Tek 2215 question
"Lewin A.R.W. Edwards" wrote:
Every once in a while one of these comes up with a back panel singing inductor that up-the-wall whines. I tried everything reasonable involving damping the tuning fork like shield, rubber mounts, etc. Have you considered active noise mitigation - bolt a voice coil to it and inject a 180-degree-out-of-phase signal to damp the vibration? :) It makes more sense to sell the unit to a deaf person. -- Many thanks, Don Lancaster Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552 voice: (928)428-4073 email: Please visit my GURU's LAIR web site at http://www.tinaja.com |
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