Audio 'Sniffer' or tester
Posted:
Fri Oct 05, 2012 6:54 pmby Futureman
I'm sure it exists, but does anyone know of a small battery powered box that has a built in speaker and can be used to monitor an audio signal. (Say a XLR, 1/4" ,RCA inputs)
It doesn't need to be loud, just help me fault find across the complex I work at.. (It gets boring lugging around a powered speaker to verify a signal is present)
I could DIY one, but I'm wondering if a cheap alternative exists.
Re: Audio 'Sniffer' or tester
Posted:
Fri Oct 05, 2012 8:13 pmby Alastair Reynolds
Use an LM386 Ic. 8 pin chip minimal components needed . Will run off a 9volt battery and drive a 2" speaker at about 1/4 watt. Put a 10k log pot in the input.
http://www.hobby-hour.com/electronics/lm386-power-audio.php
Re: Audio 'Sniffer' or tester
Posted:
Fri Oct 05, 2012 11:33 pmby rick
There has to be half a dozen micro practice guitar amps
About .. About the size of a cigarette pack
Marshalls twins tweeds dunno if they cost much ?
Re: Audio 'Sniffer' or tester
Posted:
Fri Oct 05, 2012 11:50 pmby jkhuri44
The Smokey Amp....uses an LM386. could prob test, the wrong impedance...and double up as a battery powered amp that can power a 4x12 as well
Re: Audio 'Sniffer' or tester
Posted:
Sun Oct 07, 2012 7:35 amby SYOS
Whirlwind make a product called a Q-Box
http://whirlwindusa.com/catalog/black-b ... sters/qboxI used to own one and it was great, lost it somewhere......
Re: Audio 'Sniffer' or tester
Posted:
Sun Oct 07, 2012 3:32 pmby Futureman
I saw those, but they were outside my price range.. (Around $150 from memory)
I bought one of these off ebay for $7.95
http://www.ebay.com.au/itm/400325572189 ... 1439.l2649It'll cut down on build time, and I can put it in a diecast box with XLR & Jack & RCA inputs.. sorted.
I had thought about the mini guitar amplifier, but I know it'd eventually get trashed around here.
Cheers.
Mike
Re: Audio 'Sniffer' or tester
Posted:
Sun Oct 07, 2012 3:43 pmby Alastair Reynolds
Brilliant, you couldn't buy the parts for that let alone a PCB as well.good solution,maybe chuck a little 600 ohm to 10 k transformer in front on the xlr and the RCA straight into the input.
Re: Audio 'Sniffer' or tester
Posted:
Tue Oct 09, 2012 8:58 pmby davek
For a totally passive solution, find an old 802 style Telecom phone and use the receiver (earpiece). It will work on line level signals, is portable and doesn't require batteries.
Re: Audio 'Sniffer' or tester
Posted:
Wed Oct 10, 2012 7:01 amby Drumstruck
A small multi-meter is handy too for simple connectivity / voltage tests - no audio in my old VU version though
