SPDIF amplifier
in [Design]
|
From: Mark Zenier on 1 Mar 2007 12:19 In article <1172764822.425589.54180(a)n33g2000cwc.googlegroups.com>, Dirk Bruere at NeoPax <dirk.bruere(a)gmail.com> wrote: >I want to amplify and distribute SPDIF to three systems over maybe >100m feeding into systems that take AES/EBU. What about a distribution amp for VGA video? Mark Zenier mzenier(a)eskimo.com Googleproofaddress(account:mzenier provider:eskimo domain:com)
From: Eeyore on 2 Mar 2007 12:31 Dirk Bruere at NeoPax wrote: > Eeyore <rabbitsfriendsandrelati...(a)hotmail.com> wrote: > > Dirk Bruere at NeoPax wrote: > > > > > I want to amplify and distribute SPDIF to three systems over maybe > > > 100m feeding into systems that take AES/EBU. > > > So, thinking of putting the SPDIF through an amp and then splitting it > > > through a 4 Way off the shelf passive F- Splitter. > > > Can anyone recommend a cheap amp that might be suitable for this? > > > People have suggested TV amps but I can't seem to find any that don't > > > cut off below about 88MHz (FM). > > > > A video DA should be OK to distribute SPDIF but the signal voltage of SPDIF is > > too low for AES. > > I know, although it's right on the edge over short runs. > I was hoping for a bit of voltage amplification. > Anyway, look like I'm going to have to make my own given the ludicrous > prices companies are charging for what is basically a simple circuit. > I estimate that the total cost of the parts excluding PCB for a 1:3 > distributor will be around �10 one off. And that includes xformer > isolation. > > Which is somewhat lower than the hundreds I've seen quoted. > Just got to find a decent circuit design, or create one. > Been looking at this (half way down) > http://www.epanorama.net/documents/audio/spdif.html > > Opinions? Suggestions? Ebay of course ! http://cgi.ebay.co.uk/S674-1-to-6-Video-Signal-Amplifier-In-Car-for-TV-VCD_W0QQitemZ300086553221QQihZ020QQcategoryZ67772QQrdZ1QQcmdZViewItem Graham
From: Dirk Bruere at NeoPax on 2 Mar 2007 12:57 On 2 Mar, 17:31, Eeyore <rabbitsfriendsandrelati...(a)hotmail.com> wrote: > Dirk Bruere at NeoPax wrote: > > > > > Eeyore <rabbitsfriendsandrelati...(a)hotmail.com> wrote: > > > Dirk Bruere at NeoPax wrote: > > > > > I want to amplify and distributeSPDIFto three systems over maybe > > > > 100m feeding into systems that take AES/EBU. > > > > So, thinking of putting theSPDIFthrough an amp and then splitting it > > > > through a 4 Way off the shelf passive F- Splitter. > > > > Can anyone recommend a cheap amp that might be suitable for this? > > > > People have suggested TV amps but I can't seem to find any that don't > > > > cut off below about 88MHz (FM). > > > > A video DA should be OK to distributeSPDIFbut the signal voltage ofSPDIFis > > > too low for AES. > > > I know, although it's right on the edge over short runs. > > I was hoping for a bit of voltage amplification. > > Anyway, look like I'm going to have to make my own given the ludicrous > > prices companies are charging for what is basically a simple circuit. > > I estimate that the total cost of the parts excluding PCB for a 1:3 > > distributor will be around £10 one off. And that includes xformer > > isolation. > > > Which is somewhat lower than the hundreds I've seen quoted. > > Just got to find a decent circuit design, or create one. > > Been looking at this (half way down) > >http://www.epanorama.net/documents/audio/spdif.html > > > Opinions? Suggestions? > > Ebay of course ! > > http://cgi.ebay.co.uk/S674-1-to-6-Video-Signal-Amplifier-In-Car-for-T... > > Graham I assume that won't give me better than 1V p-p. Apart from that I am likely to need more than 1 off and a reliable supply of them. Dirk
From: Dirk Bruere at NeoPax on 4 Mar 2007 20:57 Dirk Bruere at NeoPax wrote: > I want to amplify and distribute SPDIF to three systems over maybe > 100m feeding into systems that take AES/EBU. > So, thinking of putting the SPDIF through an amp and then splitting it > through a 4 Way off the shelf passive F- Splitter. > Can anyone recommend a cheap amp that might be suitable for this? > People have suggested TV amps but I can't seem to find any that don't > cut off below about 88MHz (FM). > > I'd also like to boost the voltage a bit as well since I'm feeding > into EAS/EBU. > I know I could probably put one together using a buffer amp chip or > something but I don't want to have to get into making, soldering and > packaging a solution of my own. > > Someone somewhere must do what I want at a reasonable price. > I know someone does it at an *unreasonable* price - approx $350, but > that seems aimed at audiofools. Looks like I'm going to be doing a DIY job, since we can't buy in at the right price. So, here's the design. SPDIF feeding into an AD818 wideband amp, with a gain of 4. The o/p of this to an HC Schitt trigger and this feeds into four RS485 line drivers. Each o/p then drives an audio digital transformer for isolation (and to get rid of any potential ground loop problems we may encounter). Opinions? -- Dirk http://www.onetribe.me.uk - The UK's only occult talk show Presented by Dirk Bruere and Marc Power on ResonanceFM 104.4 http://www.resonancefm.com
From: Dirk Bruere at NeoPax on 4 Mar 2007 21:01 Dirk Bruere at NeoPax wrote: > Dirk Bruere at NeoPax wrote: >> I want to amplify and distribute SPDIF to three systems over maybe >> 100m feeding into systems that take AES/EBU. >> So, thinking of putting the SPDIF through an amp and then splitting it >> through a 4 Way off the shelf passive F- Splitter. >> Can anyone recommend a cheap amp that might be suitable for this? >> People have suggested TV amps but I can't seem to find any that don't >> cut off below about 88MHz (FM). >> >> I'd also like to boost the voltage a bit as well since I'm feeding >> into EAS/EBU. >> I know I could probably put one together using a buffer amp chip or >> something but I don't want to have to get into making, soldering and >> packaging a solution of my own. >> >> Someone somewhere must do what I want at a reasonable price. >> I know someone does it at an *unreasonable* price - approx $350, but >> that seems aimed at audiofools. > > Looks like I'm going to be doing a DIY job, since we can't buy in at the > right price. > > So, here's the design. > > SPDIF feeding into an AD818 wideband amp, with a gain of 4. > The o/p of this to an HC Schitt trigger and this feeds into four RS485 > line drivers. Each o/p then drives an audio digital transformer for > isolation (and to get rid of any potential ground loop problems we may > encounter). > > Opinions? BTW, I'll be using the free Eagle layout package and a cheap PCB prototyping house in the UK. Apart from my valuable time I estimate total overall cost for a 1 in 4 out converter (one off initially) to be around $100 including XLR connectors. Production should bring that down to around $50 in the quantities we want including labour cost. -- Dirk http://www.onetribe.me.uk - The UK's only occult talk show Presented by Dirk Bruere and Marc Power on ResonanceFM 104.4 http://www.resonancefm.com
First
|
Prev
|
Next
|
Last
Pages: 1 2 3 4 5 Prev: 12-volt matrix input->output? Next: 1000V high side gate drive |