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Old 27th October 2009, 11:15 PM   #1
Reevine is offline Reevine  United States
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Question RCA to 3.5mm out converter

Im wanting to build a converter from RCA audio to 3.5mm out with a volume control. does anyone know how to do this exactly?
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Old 27th October 2009, 11:30 PM   #2
Glowbug is offline Glowbug  United States
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RCA input jack, 25k to 100k stereo potentiometer depending on your source's output impedance and amp's input impedance, 3.5mm jack for output

Would fit in a small project box.
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Old 28th October 2009, 12:43 AM   #3
Reevine is offline Reevine  United States
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thanks thats just what i needed. appreciate it.
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Old 3rd November 2009, 03:05 AM   #4
Reevine is offline Reevine  United States
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Exclamation Other idea

well i found something that works better. Its a headphone amplifier. Instead of a potentiometer it uses an electronic volume control. so i used a rca "y" adapter and an a rca to headphone converter. im going to take it apart to see what they used as an IC chip. and how the circuit is designed. ill post some pictures and make a schematic of it. maybe there is a way to make it better? or a DIY version.
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Old 4th November 2009, 06:42 PM   #5
lgreen is offline lgreen  United States
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You have to be careful with headphone amps uses as line drivers, given impedances and so forth. But, for what it is worth, here is my CMoy with headphone jacks and RCAs.

Cmoy.
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Old 4th November 2009, 10:58 PM   #6
tomchr is offline tomchr  United States
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You won't be able to drive your headphones through a pot. Add a buffer (LME49720 with unity feedback for example) between the pot and the output. Of course, you'll now need to add a power supply. A couple of 9 V batteries would do, but their lifetime would be somewhat limited as the LME497x0 draws 5.5 mA per channel. This is probably the most basic headphone amp you'll get.

You could expand the project a bit by looking at using the LME49600 headphone amp. I built my headphone amp following the "typical application" schematic in the LME49600 data sheet. It's pretty darn sweet!!

~Tom
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