Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.


2 posts

Wannabe Geek


Topic # 57096 2-Feb-2010 21:25
Send private message

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!

Create new topic
3535 posts

Uber Geek
+1 received by user: 125

Trusted

  Reply # 295592 3-Feb-2010 00:05
Send private message

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
Send private message

Thanks Grant K, I will give that a crack and see how it works out. 

Cheers.

Create new topic

Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Hawaiki Transpacific cable ready-for-service
Posted 20-Jul-2018 11:29


Microsoft Dynamics 365 Business Central launches
Posted 10-Jul-2018 10:40


Spark completes first milestone in voice platform upgrade
Posted 10-Jul-2018 09:36


Microsoft ices heated developers
Posted 6-Jul-2018 20:16


PB Technologies charged for its extended warranties and warned for bait advertising
Posted 3-Jul-2018 15:45


Almost 20,000 people claim credits from Spark
Posted 29-Jun-2018 10:40


Cove sells NZ's first insurance policy via chatbot
Posted 25-Jun-2018 10:04


N4L helping TAKA Trust bridge the digital divide for Lower Hutt students
Posted 18-Jun-2018 13:08


Winners Announced for 2018 CIO Awards
Posted 18-Jun-2018 13:03


Logitech Rally sets new standard for USB-connected video conference cameras
Posted 18-Jun-2018 09:27


Russell Stanners steps down as Vodafone NZ CEO
Posted 12-Jun-2018 09:13


Intergen recognised as 2018 Microsoft Country Partner of the Year for New Zealand
Posted 12-Jun-2018 08:00


Finalists Announced For Microsoft NZ Partner Awards
Posted 6-Jun-2018 15:12


Vocus Group and Vodafone announce joint venture to accelerate fibre innovation
Posted 5-Jun-2018 10:52


Kogan.com to launch Kogan Mobile in New Zealand
Posted 4-Jun-2018 14:34



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.