|
 |
|
|
| View previous topic :: View next topic |
| Author |
Message |
gjaky
Joined: 05 Jun 2010
Posts: 2790
Location: Budapest, Hungary
|
 Link Posted: Tue Aug 06, 2019 11:32 am Post subject: The VIM-DB |
 |
|
Not that modifying CRT projectors are still a hot topic, but I have to entertain myself with something...
Here is a new development waiting for trial.
This is a modification board specifically for Marquee projectors. This daughter board follows the conventional circuit topology like the original VIM: signal switch followed by a variable gain amplifier. But with all new components, this is not based on the AD834/835 multipliers anymore, instead a variable gain amplifier called VCA824.
Regarding bandwidth the previous VNB-DB boards were already as good as needed, but it is somewhat difficult to deal with as it needs the VIM, VNB, LVPS and HDM modified to various extent. While the later two is a recommended modification to any Marquee anyway, it is still somewhat demanding to carry out such modification.
This new board is aimed to overcome this weakness, it again contains all signal processing on a single PCB (including own, separate, low noise power supply), but this time located on the VIM, with retaining the miniRCA connectors it would be possible to upgrade the signal path in a simple way. The board is so much self contained that only minimal modification would be needed to the VIM: adding only three resistors and tapping certain control signals, and of course the video input.
The VCA824 multiplier has 700MHz bandwidth (even better than the AD834, while cheaper than that!) and offers easily adjustable gain (beyond unity), which was torublesome on both AD834-835. Also very low noise.
The signal switch is called TMUX154E, which also appears to be an excellent switch with good isolation (which is further augmented by double switching scheme), 900MHz bandwidth, while having low on channel resistance and low input capacitance.
Overall I'd expect even better bandwidth performance as possible with the VNB-DB but at a lower labour.
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
|
|
| Back to top |
|
 |
nidi
Joined: 17 Aug 2008
Posts: 303
Location: Switzerland
|
| Link Posted: Tue Aug 06, 2019 6:02 pm Post subject: |
|
|
Fantastic , sounds very interesting.
It's great we Marquee owners still have things to look forward to.
|
|
| Back to top |
|
|
nidi
Joined: 17 Aug 2008
Posts: 303
Location: Switzerland
|
| Link Posted: Tue Aug 06, 2019 6:02 pm Post subject: |
|
|
|
so how long has this pcb to wait to be populated?
|
|
| Back to top |
|
|
gjaky
Joined: 05 Jun 2010
Posts: 2790
Location: Budapest, Hungary
|
| Link Posted: Wed Aug 07, 2019 10:55 am Post subject: |
|
|
| nidi wrote: | | so how long has this pcb to wait to be populated? |
As soon as I'll have my electronics stuff in the new house 
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
|
|
| Back to top |
|
|
Meemil
Joined: 25 Mar 2016
Posts: 96
Location: Finland
|
| Link Posted: Wed Aug 07, 2019 3:00 pm Post subject: |
|
|
|
Big ups for this, absolutely great stuff!
|
|
| Back to top |
|
|
AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26690
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
|
| Link Posted: Thu Aug 08, 2019 3:51 am Post subject: |
|
|
Now if some one would just mod a SONY 1031 ;P
_________________
Tech support for nothing
CRT.
HD done right!
|
|
| Back to top |
|
|
gjaky
Joined: 05 Jun 2010
Posts: 2790
Location: Budapest, Hungary
|
| Link Posted: Thu Aug 08, 2019 6:06 am Post subject: |
|
|
| AnalogRocks wrote: | | Now if some one would just mod a SONY 1031 ;P |
The VNB-DB was designed for cross-platform (Sony, Barco, etc) operation in mind, although my first idea wasn't exactly the 1031
Regardless, so far I've only made VNB-DB for Electrohome and I believe it will stay like that, although the door is open for the possibilities 
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
|
|
| Back to top |
|
|
nidi
Joined: 17 Aug 2008
Posts: 303
Location: Switzerland
|
| Link Posted: Fri Aug 09, 2019 6:31 pm Post subject: |
|
|
one board for Marquee, Sony & Barco ?
wouldn't that be sweet!
so when's the big move of the electronics stuff to the house?
can't wait!
|
|
| Back to top |
|
|
HaydnG90
Joined: 22 May 2006
Posts: 1335
|
| Link Posted: Fri Aug 09, 2019 11:06 pm Post subject: |
|
|
|
Sony please
|
|
| Back to top |
|
|
gjaky
Joined: 05 Jun 2010
Posts: 2790
Location: Budapest, Hungary
|
| Link Posted: Sat Aug 10, 2019 5:24 am Post subject: |
|
|
| nidi wrote: | one board for Marquee, Sony & Barco ?
wouldn't that be sweet!
|
The VNB-DB family was meant just like that. I've briefly evaluated the possibility adding Marquee VNB (the best possible neck card) to Sony and Barco. In fact I've almost finished -on theoretical basis at least- the needed modifications for fitting in to a Barco 909, and the Sony G90 way does not look impossible either. But without a test chassis (or a helper with deep understanding) it would be really hard to fully finish such project.
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
|
|
| Back to top |
|
|
km987654
Joined: 25 Jul 2007
Posts: 2857
Location: Australia
TV/Projector: Barco BG809s
|
| Link Posted: Sat Aug 10, 2019 7:22 am Post subject: |
|
|
| gjaky wrote: | | nidi wrote: | one board for Marquee, Sony & Barco ?
wouldn't that be sweet!
|
The VNB-DB family was meant just like that. I've briefly evaluated the possibility adding Marquee VNB (the best possible neck card) to Sony and Barco. In fact I've almost finished -on theoretical basis at least- the needed modifications for fitting in to a Barco 909, and the Sony G90 way does not look impossible either. But without a test chassis (or a helper with deep understanding) it would be really hard to fully finish such project. |
Have you ever built this for any Barco?
|
|
| Back to top |
|
|
gjaky
Joined: 05 Jun 2010
Posts: 2790
Location: Budapest, Hungary
|
| Link Posted: Sat Aug 10, 2019 9:27 am Post subject: |
|
|
| km987654 wrote: | | gjaky wrote: | | nidi wrote: | one board for Marquee, Sony & Barco ?
wouldn't that be sweet!
|
The VNB-DB family was meant just like that. I've briefly evaluated the possibility adding Marquee VNB (the best possible neck card) to Sony and Barco. In fact I've almost finished -on theoretical basis at least- the needed modifications for fitting in to a Barco 909, and the Sony G90 way does not look impossible either. But without a test chassis (or a helper with deep understanding) it would be really hard to fully finish such project. |
Have you ever built this for any Barco? |
I haven't built it (yet), but worked out an easy and cheap way to power the Marquee VNBs in the Barco. I also have enough Marquee VNBs to supply such an experiment. I also figured out the needed modifications to interface the daughterboards to the Barco (using 909 style switcher and driver boards).
As usual, these ideas not necessarily mean it will work right away, so a 909 test chassis would be needed (what I don't have) to finalize such idea, or someone who can also understand what is going on the projector to some extent (and be able to take measurements and solder) so we could work out arising problems remotely at least.
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
|
|
| Back to top |
|
|
nidi
Joined: 17 Aug 2008
Posts: 303
Location: Switzerland
|
| Link Posted: Fri Aug 16, 2019 5:51 pm Post subject: |
|
|
any updates on the project, Gabor?
moved that vintage electronics stuff to the house?
|
|
| Back to top |
|
|
gjaky
Joined: 05 Jun 2010
Posts: 2790
Location: Budapest, Hungary
|
| Link Posted: Fri Aug 16, 2019 7:10 pm Post subject: |
|
|
| nidi wrote: | any updates on the project, Gabor?
moved that vintage electronics stuff to the house? |
Stuff is only partly moved, the Marquee is still over there...
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
|
|
| Back to top |
|
|
nidi
Joined: 17 Aug 2008
Posts: 303
Location: Switzerland
|
| Link Posted: Fri Aug 23, 2019 5:45 pm Post subject: |
|
|
how many people are still out there using 9" CRTprojector?
Marquee? Sony G90? Barco 909 /Cine 9?
who is interested in a mod for the Sony or Barco ?
|
|
| Back to top |
|
|
digitalayon
Joined: 02 Mar 2009
Posts: 921
|
| Link Posted: Fri Aug 23, 2019 6:30 pm Post subject: |
|
|
| nidi wrote: | how many people are still out there using 9" CRTprojector?
Marquee? Sony G90? Barco 909 /Cine 9?
who is interested in a mod for the Sony or Barco ? |
VVI here!!
|
|
| Back to top |
|
|
digitalayon
Joined: 02 Mar 2009
Posts: 921
|
| Link Posted: Fri Aug 23, 2019 6:32 pm Post subject: Re: The VIM-DB |
|
|
| gjaky wrote: | Not that modifying CRT projectors are still a hot topic, but I have to entertain myself with something...
Here is a new development waiting for trial.
This is a modification board specifically for Marquee projectors. This daughter board follows the conventional circuit topology like the original VIM: signal switch followed by a variable gain amplifier. But with all new components, this is not based on the AD834/835 multipliers anymore, instead a variable gain amplifier called VCA824.
Regarding bandwidth the previous VNB-DB boards were already as good as needed, but it is somewhat difficult to deal with as it needs the VIM, VNB, LVPS and HDM modified to various extent. While the later two is a recommended modification to any Marquee anyway, it is still somewhat demanding to carry out such modification.
This new board is aimed to overcome this weakness, it again contains all signal processing on a single PCB (including own, separate, low noise power supply), but this time located on the VIM, with retaining the miniRCA connectors it would be possible to upgrade the signal path in a simple way. The board is so much self contained that only minimal modification would be needed to the VIM: adding only three resistors and tapping certain control signals, and of course the video input.
The VCA824 multiplier has 700MHz bandwidth (even better than the AD834, while cheaper than that!) and offers easily adjustable gain (beyond unity), which was torublesome on both AD834-835. Also very low noise.
The signal switch is called TMUX154E, which also appears to be an excellent switch with good isolation (which is further augmented by double switching scheme), 900MHz bandwidth, while having low on channel resistance and low input capacitance.
Overall I'd expect even better bandwidth performance as possible with the VNB-DB but at a lower labour. |
I thought you had Mike Parker modded cards and VIM.
|
|
| Back to top |
|
|
digitalayon
Joined: 02 Mar 2009
Posts: 921
|
| Link Posted: Fri Aug 23, 2019 6:36 pm Post subject: Re: The VIM-DB |
|
|
| gjaky wrote: | Not that modifying CRT projectors are still a hot topic, but I have to entertain myself with something...
Here is a new development waiting for trial.
This is a modification board specifically for Marquee projectors. This daughter board follows the conventional circuit topology like the original VIM: signal switch followed by a variable gain amplifier. But with all new components, this is not based on the AD834/835 multipliers anymore, instead a variable gain amplifier called VCA824.
Regarding bandwidth the previous VNB-DB boards were already as good as needed, but it is somewhat difficult to deal with as it needs the VIM, VNB, LVPS and HDM modified to various extent. While the later two is a recommended modification to any Marquee anyway, it is still somewhat demanding to carry out such modification.
This new board is aimed to overcome this weakness, it again contains all signal processing on a single PCB (including own, separate, low noise power supply), but this time located on the VIM, with retaining the miniRCA connectors it would be possible to upgrade the signal path in a simple way. The board is so much self contained that only minimal modification would be needed to the VIM: adding only three resistors and tapping certain control signals, and of course the video input.
The VCA824 multiplier has 700MHz bandwidth (even better than the AD834, while cheaper than that!) and offers easily adjustable gain (beyond unity), which was torublesome on both AD834-835. Also very low noise.
The signal switch is called TMUX154E, which also appears to be an excellent switch with good isolation (which is further augmented by double switching scheme), 900MHz bandwidth, while having low on channel resistance and low input capacitance.
Overall I'd expect even better bandwidth performance as possible with the VNB-DB but at a lower labour. |
I thought you had Mike Parker modded cards and VIM.
|
|
| Back to top |
|
|
gjaky
Joined: 05 Jun 2010
Posts: 2790
Location: Budapest, Hungary
|
| Link Posted: Fri Aug 23, 2019 8:01 pm Post subject: Re: The VIM-DB |
|
|
| digitalayon wrote: | | gjaky wrote: | Not that modifying CRT projectors are still a hot topic, but I have to entertain myself with something...
Here is a new development waiting for trial.
This is a modification board specifically for Marquee projectors. This daughter board follows the conventional circuit topology like the original VIM: signal switch followed by a variable gain amplifier. But with all new components, this is not based on the AD834/835 multipliers anymore, instead a variable gain amplifier called VCA824.
Regarding bandwidth the previous VNB-DB boards were already as good as needed, but it is somewhat difficult to deal with as it needs the VIM, VNB, LVPS and HDM modified to various extent. While the later two is a recommended modification to any Marquee anyway, it is still somewhat demanding to carry out such modification.
This new board is aimed to overcome this weakness, it again contains all signal processing on a single PCB (including own, separate, low noise power supply), but this time located on the VIM, with retaining the miniRCA connectors it would be possible to upgrade the signal path in a simple way. The board is so much self contained that only minimal modification would be needed to the VIM: adding only three resistors and tapping certain control signals, and of course the video input.
The VCA824 multiplier has 700MHz bandwidth (even better than the AD834, while cheaper than that!) and offers easily adjustable gain (beyond unity), which was torublesome on both AD834-835. Also very low noise.
The signal switch is called TMUX154E, which also appears to be an excellent switch with good isolation (which is further augmented by double switching scheme), 900MHz bandwidth, while having low on channel resistance and low input capacitance.
Overall I'd expect even better bandwidth performance as possible with the VNB-DB but at a lower labour. |
I thought you had Mike Parker modded cards and VIM. |
No, I never had any MP modded boards, really.
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
|
|
| Back to top |
|
|
nidi
Joined: 17 Aug 2008
Posts: 303
Location: Switzerland
|
| Link Posted: Wed Aug 28, 2019 4:44 pm Post subject: |
|
|
|
Gabor, any chance of a pic of the populated board?
|
|
| Back to top |
|
|
|
|
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Forum powered by phpBB © phpBB Group
|
|
Forum FAQ
Search
Memberlist
Photo Albums
Register
Profile
Private Messages
Log in
