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AnalogRocks
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Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Tue Sep 02, 2014 11:00 am Post subject: RCA line level to Mic adaptors? |
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I need a couple of RCA line level to 1/8" mono mic adaptors. Radio Shack sold them for years but no longer list's them. Anyone know of a piece that fits the bill?
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ecrabb
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Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Tue Sep 02, 2014 5:26 pm Post subject: |
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Thanks SC, but those are just passive adaptors. The ones I use to see at RS had some electronics in there to adapt the signal levels. they were about 2 inches long and red in color.
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ecrabb
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Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Tue Sep 02, 2014 5:28 pm Post subject: |
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So, they took a line-level RCA output and adapted them to a 3.5mm microphone input? What's the use case?
SC
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AnalogRocks
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Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Tue Sep 02, 2014 5:36 pm Post subject: |
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| ecrabb wrote: | So, they took a line-level RCA output and adapted them to a 3.5mm microphone input? What's the use case?
SC |
In my case I have a mixing board that has 4 mic inputs, and only RCA line level outputs.
My other thing could be to find an external USB sound card with RCA line level inputs OR a pair of adaptors and a stereo mic input.
I have two high end sound cards here from the HTPC days, not sure if they have the stereo mic inputs or not. I have to check.
I need to get some stereo audio into the PC for my Hallowe'en haunt. I want the voice to slide back and forth across the front of the house. Especially the maniacal laughter and the whispering. 
This was so easy when I recorded to tape...
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AnalogRocks
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Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Tue Sep 02, 2014 6:05 pm Post subject: |
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I love collectors...
From page 129 of the 1986 Radio Shack bible:
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8936 Time(s) |
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18.59 KB |
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8936 Time(s) |
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AnalogRocks
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| Posted: Tue Sep 02, 2014 6:08 pm Post subject: |
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Anyone got a time machine? 
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Tue Sep 02, 2014 6:11 pm Post subject: |
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| AnalogRocks wrote: | I want the voice to slide back and forth across the front of the house. Especially the maniacal laughter and the whispering.
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Just find a PMSing redhead. 
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Tue Sep 02, 2014 6:32 pm Post subject: |
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Jeremy, a simple resistor divider is inside that RCA-jack adaptor. Put an 1k Ohm resistor between the hot pin of RCA and TRS, and put a 10 Ohm resistor between the ground and the hot pin of TRS, and you get -40dB gain.
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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
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AnalogRocks
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Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Tue Sep 02, 2014 11:40 pm Post subject: |
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| gjaky wrote: | | Jeremy, a simple resistor divider is inside that RCA-jack adaptor. Put an 1k Ohm resistor between the hot pin of RCA and TRS, and put a 10 Ohm resistor between the ground and the hot pin of TRS, and you get -40dB gain. |
Thanks! I knew it was something simple. BUT! If anyone has a pair of these please let me know. I'll give them a good home and won't feed them after midnight. 
What does TRS stand for?? ( Tandy Radio Shack ) 
Now on to my next post: http://www.curtpalme.com/forum/viewtopic.php?p=418084#418084
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AnalogRocks
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Location: Toronto, Ontario, Canada
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| Posted: Tue Sep 02, 2014 11:56 pm Post subject: |
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| Curt Palme wrote: | | AnalogRocks wrote: | I want the voice to slide back and forth across the front of the house. Especially the maniacal laughter and the whispering.
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Just find a PMSing redhead. |
No, and HELL NO!
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Wed Sep 03, 2014 6:06 am Post subject: |
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| AnalogRocks wrote: | | gjaky wrote: | | Jeremy, a simple resistor divider is inside that RCA-jack adaptor. Put an 1k Ohm resistor between the hot pin of RCA and TRS, and put a 10 Ohm resistor between the ground and the hot pin of TRS, and you get -40dB gain. |
Thanks! I knew it was something simple. BUT! If anyone has a pair of these please let me know. I'll give them a good home and won't feed them after midnight.
What does TRS stand for?? ( Tandy Radio Shack )
Now on to my next post: http://www.curtpalme.com/forum/viewtopic.php?p=418084#418084 |
TRS stands for Tip Ring Sleeve aka. phone jack.
I don't have any of these, I just reverse engineered.
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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
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