[Top] [All Lists]

Re: Homebrew Recorder

Subject: Re: Homebrew Recorder
From: "Steve Sergeant" stevesgt
Date: Thu May 31, 2012 4:48 pm ((PDT))
These are all desirable specs.

I'd want to see the battery life indication flexible enough to work with
alkaline, lithium, NiMH, and perhaps anything new that comes along in
the AA form factor.

I'd want to have a pre-set, calibrated input gain that's not affected by
an external knob during recording for when I want to be able to reliably
determine SPL from recorded signal levels.

I have a couple of suggestions on mechanical design:
1) Place all controls and displays on a single panel of the box, and all
of the connectors on exactly one other. This makes it easiest to use in
some kind of protective case.
2) Put the batteries in some kind of cartridge carrier, so that you can
remove an entire carrier full of batteries in one piece, instead of
fumbling with individual AA cells.

On 5/31/12 15:49 PM, sainganrob wrote:
> Hello again to all. First post to the group after a 4 year absence!.
> Anyway, here's the thing. I'm lucky enough !? to work for an audio mixer =
manufacturer and for sometime have been thinking about knocking up a 2 chan=
nel recorder specifically aimed at nature recording for myself. So, I've so=
rt of settled on the following spec. and was hoping the group could give it=
 the once over and make any suggestions re- omissions / alternatives etc.
> thanks Rob.
> 2 channel
> dynamic / phantom /pip
> switchable front end gain 30/40/50/60dB
> 2 x analogue fader control. mute to +20dB(gangable for stereo)
> 2 x switchable analogue high pass filter
> separate MS decoders for input and headphones (width control on input)
> analogue peak limiter (gangable for stereo)
> switchable 48/96kHz - 16/24 bit ADC
> pre-record buffer (5 sec. ?)
> 1kHz / 0dBu (ref. 0.775V) reference tone
> internal slate / metadata microphone
> internal solid state drive 128 GB (FAT32)
> file format - uncompressed .wav
> usb 2.0 file transfer (and maybe 192kHz streaming audio for external ultr=
asound pc recording)
> monochrome oled display - batt. status / audio levels / SSD capacity
> no menus
> 2 x XLR-3F audio in
> 1 x XLR-4M ext. pwr. in
> 1/4" headphone jack
> 4 x AA battery compartment
> machined aluminium chassis
> glove operable switches / faders
> freq. resp. 20Hz-20kHz flat
> -128dBu e_in 20kHz BW unweighted (ref. 0.775V) / 150R source / 60dB gain
> 118dB dynamic range / 30dB gain
> -40 / +80 deg.C operating temp.

<Prev in Thread] Current Thread [Next in Thread>

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the naturerecordists mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU