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2 posts

Wannabe Geek


Topic # 57096 2-Feb-2010 21:25
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Hello, hope someone can offer help.

In my rally car, I have an intercom (Peltor FMT110) which has an RCA audio output for recording the speech to an external source, in my case a Sony HC42E Handycam.  The problem I have is the sound output from the intercom is very low, therefore I would think I need some type of in-line amplifier.  Here is some info I have found on the net:

The Peltor's FMT-110's claimed output is 20 mV. And there are various standards for line level: +4 dBU for pro stuff = 1.23 Vrms, 0dBm for prosumer stuff = 0.775 Vrms, and -10dBV for most consumer stuff = 0.316 Vrms. So, in general, you probably want about a 20:1 gain preamp, and variable 10:1 - 50:1 gain preamp would be best to allow you to tune the gain to best match the desired levels and sensitivity of your specific camcorder's audio line in.

I didn't know what half of that meant, however the 10:1 - 50:1 gain preamp makes a bit of sense.  So can anyone point me in the direction of such an item, or perhaps offer any advise on boosting the sound output.

Cheers in advance!

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  Reply # 295592 3-Feb-2010 00:05
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Something like this from Jaycar would probably do the job:

http://www.jaycar.co.nz/produc...

You will need to vary the on-board resistor to reduce the gain. 40dB is 100:1, so is probably more than you want for your Intercom - Handycam project.

The guys at Jaycar are also pretty helpful if you need advice about stuff like this.







2 posts

Wannabe Geek


  Reply # 296170 4-Feb-2010 19:31
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Thanks Grant K, I will give that a crack and see how it works out. 

Cheers.

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