How can I connect a frequency generator (BNC) to an amp (RCA) ?

Bricolo · 20th November 2003, 06:56 PM

I want to test my gainclone, but there's a small problem:

the gainclone has RCA inputs, and the frequency generator has a BNC output, and uses coaxial cable.

For sure, I'll have to build (or buy) a BNC->RCA adapter. But what should I put in it?
Only 2 plugs, nothing more? Or terminate the coax line with a 50R resistor from live to ground?

Alex

jwb · 20th November 2003, 07:28 PM

It doesn't matter at audio frequencies. Just use the converter.

tiroth · 20th November 2003, 07:36 PM

Many surplus shops sell such converters:

http://www.allelectronics.com/cgi-bi...RCA&type=store

I would not worry about termination; test your amp with the termination you expect to use in the real world. (i.e. 10k/20k etc, not 50 ohms!)

Pjotr · 20th November 2003, 07:47 PM

Hi Bricolo,

From many hi-fi shops there are also 75 coax cables available with a RCA cinch at one side and a BNC at the other side. These are intended to connect (home) video equipment together. Such a cable serves me pretty well for the same purpose as you have.

Cheers

20th November 2003, 06:56 PM	#1
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	How can I connect a frequency generator (BNC) to an amp (RCA) ? I want to test my gainclone, but there's a small problem: the gainclone has RCA inputs, and the frequency generator has a BNC output, and uses coaxial cable. For sure, I'll have to build (or buy) a BNC->RCA adapter. But what should I put in it? Only 2 plugs, nothing more? Or terminate the coax line with a 50R resistor from live to ground? Alex

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20th November 2003, 07:28 PM	#2
jwb diyAudio Member Join Date: Mar 2002 Location: San Francisco, USA	It doesn't matter at audio frequencies. Just use the converter.

20th November 2003, 07:36 PM	#3
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	Many surplus shops sell such converters: http://www.allelectronics.com/cgi-bi...RCA&type=store I would not worry about termination; test your amp with the termination you expect to use in the real world. (i.e. 10k/20k etc, not 50 ohms!)

20th November 2003, 07:47 PM	#4
Pjotr diyAudio Member Join Date: Nov 2002 Location: Netherlands	Hi Bricolo, From many hi-fi shops there are also 75 coax cables available with a RCA cinch at one side and a BNC at the other side. These are intended to connect (home) video equipment together. Such a cable serves me pretty well for the same purpose as you have. Cheers

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