8mm Forum: Line Level Output

»	8mm Forum » 16mm Forum » Line Level Output

UBBFriend: Email this page to someone!

Author

Topic: Line Level Output

Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted February 03, 2018 03:55 AM

A few projectors do not have a facility for a low level line sound output, so here's a cute accessory which will help. It connects to the projector's normal external loud speaker socket.

https://www.ebay.co.uk/itm/SPEAKER-TO-RCA-CONVERTER-HIGH-TO-LOW-LINE-LEVEL-CABLE/270662823340?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D2%26asc%3D49925%26meid%3Ddc45f6b046374fa 6b4053a471400caee%26pid%3D100005%26rk%3D2%26rkt%3D6%26mehot%3Des%26sd%3D361987845604%26itm%3D270662823340&_trksid=p2047675.c100005.m1851

--------------------
Maurice

| IP: Logged

Janice Glesser
Film Goddess

Posts: 3468
From: Sunnyvale, CA USA
Registered: Sep 2011

posted February 03, 2018 08:34 AM

A very useful adapter. This "tiny URL" link might work better Maurice .

https://tinyurl.com/ybzxl92q

--------------------
Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

| IP: Logged

Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted February 03, 2018 09:41 AM

Bummer!

(I wanted to build one!)

Can I pretend I didn’t see it? [Wink]

I got my first 16mm machine a few months ago and I need to plug it into my mixer.

The part of me that likes to solder was kind of glad there is no line out.

--------------------
All I ask is a wide screen and a projector to light her by...

| IP: Logged

Janice Glesser
Film Goddess

Posts: 3468
From: Sunnyvale, CA USA
Registered: Sep 2011

posted February 03, 2018 11:11 AM

I use a Direct Box.

--------------------
Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

| IP: Logged

Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted February 03, 2018 11:23 AM

Do these typically have external power supplies or is it just input and output audio connections?

--------------------
All I ask is a wide screen and a projector to light her by...

| IP: Logged

Janice Glesser
Film Goddess

Posts: 3468
From: Sunnyvale, CA USA
Registered: Sep 2011

posted February 03, 2018 04:00 PM

Are you asking about the Direct Box or the line-level adapter Steve? DI boxes come in 2 varieties...active and passive.

--------------------
Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

| IP: Logged

Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted February 03, 2018 04:55 PM

I guess it’s a general question. I‘ve never seen one of these and I’m curious how they are built.

I built a passive one years ago. If I do it again I’d go active: maybe add a little noise filtering and ground isolation if it made the sound nicer.

--------------------
All I ask is a wide screen and a projector to light her by...

| IP: Logged

Janice Glesser
Film Goddess

Posts: 3468
From: Sunnyvale, CA USA
Registered: Sep 2011

posted February 03, 2018 05:39 PM

The DI box does a lot more than just convert the line level. It will filter noise and ground loops especially if you have long cables. It's not a panacea for noise filtering...but definitely helps.

--------------------
Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

| IP: Logged

Mac Rebant
Junior
Posts: 21
From: Salida, CO, USA
Registered: Nov 2017

posted February 09, 2018 06:24 PM

Is this for connecting a projector to a stereo system? I didn't see a socket to insert a cable jack into.

I connect my projector to a guitar amp and it works pretty well but I've been interested in connecting it to my stereo system instead. Will this, or something similar, work for that?

| IP: Logged

Janice Glesser
Film Goddess

Posts: 3468
From: Sunnyvale, CA USA
Registered: Sep 2011

posted February 09, 2018 07:17 PM

I use the DI Box to connect to a guitar amp...but I don't see whey you can't connect it to a stereo system. I would use a stereo splitter adapter to duplicate the mono output to left and right channels. Steve... do you see any reason this wouldn't work?

--------------------
Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

| IP: Logged

Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted February 09, 2018 08:01 PM

Hi Janice,

A splitter should work just fine. That's what I used when I first started connecting my mono machines to my amp.

Worked great until I lost the thing! (Tooo many connectors and cables!)

--------------------
All I ask is a wide screen and a projector to light her by...

| IP: Logged

Fred Achberger
Junior
Posts: 7
From: Bremerton, WA, USA
Registered: Feb 2018

posted February 10, 2018 12:53 PM

Following this thread, I purchased a level converter. I need to solder a 1/4" plug onto it so that it connects to my projector. I was thinking that I could solder both left and right channels from the converter to the tip of the 1/4" plug and both grounds to the ring. Since the projector is a mono output this would put the signal on both left and right output of the level converter.
Does that sound right?

| IP: Logged

Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted February 10, 2018 01:45 PM

Fred
Not too sure of your speaker arrangement.
If you are using two separate speakers it is important that both are correctly phased, i.e., their cones go in and out together.

--------------------
Maurice

| IP: Logged

Fred Achberger
Junior
Posts: 7
From: Bremerton, WA, USA
Registered: Feb 2018

posted February 10, 2018 03:12 PM

I am trying to capture the sound from a film so I do not have any speakers.
If I connect both left and right channels into the level converter the phasing should be the same. And the signal and ground connections out should be the same.

| IP: Logged

Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted February 11, 2018 03:11 AM

Fred
Phasing is important when using two loudspeakers, but I don't think there is any such problem with the set-up which you have described.

--------------------
Maurice

| IP: Logged

All times are Central

Printer-friendly view of this topic

UBB.classic^TM 6.3.1.2