Most good quality phono hookups are well below line level but use RCA plugs/jacks (except, of course, for the USB plugs used on some of the newer turntables). The inputs and outputs on my phono preamp are RCA types. The RCA jacks are easy to hate...especially the older ones that are not gold plated...either too tight or too loose, oxidize easily and awkward to solder braid to the shield. When they are placed too close together for normal hands as with my Onkyo, they are a PITA to get in and out. But I have had poor results with the little 3.5 mm plugs and jacks as well.
RCA jacks are everywhere but they have vanished from BluRay players/recorders, are going away on TV receivers, never existed on smart phones and tend not to be used on pro gear as they are more noise prone than balanced inputs. They do go way back into the '40s and perhaps beyond so there is a lot of legacy gear about. My 8 year old Sony Bravia TV has them as does my equally old Onkyo stereo reciever.KanoMaster22 wrote: I thought I hadn't seen much RCA inputs before but maybe they are more popular in Australia (where Flatmax is based) or it could be that it was a requested feature.
I modified a HighPi case https://www.amazon.com/gp/product/B0169 ... UTF8&psc=1 crudely to accommodate the RCA jacks and gain pots on the AudioInjector and the result is not perfect but looks ok. It might be a problem for cooling on a 3B but the 3B+ version has superior cooling so is probably ok. My 2B has no problem that way. There is also a RPi zero form factor version but it needs to have jacks and pots installed (from looking at the pics).KanoMaster22 wrote: To start with the ergonomics will probably be a lot worse (possibly a laser cut case) than a normal portable recorder but I would hope to improve this over time.
wh7qq wrote: ↑Mon Jul 02, 2018 8:09 pmLine input levels on phono sockets are hundreds of millivolts. The output of microphones is typically hundreds of microvolts, ie 1000 times weaker. Thus the audibility of picked up noise is very much greater.KanoMaster22 wrote: While the proximity to the main board is scary for all its computer hash, it seems not to be a problem for my ears.
No you have not understood at all and it does not bode well for the success of your project.
The fe-pi does look interesting and the V-IV version sports an array of RCA jacks and all have input A-D conversion but they do not say a word about codec used (V-IV), bit depth, sample rate and so on and none of these show up in my perusal of the data sheet for the SGTL5000 codec used in at least the Z V2. I am unsure if this is something to be concerned with or not. At $12 US, (before shipping info) it is worth a try even if it is junk. I have not seen a low cost USB based audio device that supports inputs of any kind but maybe that is just not a complete sample. I ordered the zero version just for fun so I will review it here if and when it arrives and I get it going. BTW, it came to $15.39 for USPS first class.
Agreed but with a big proviso. You need to have or acquire sufficient knowledge to accomplish it. In this case, the OP does not and it isn't the sort of project that just needs some forum replies to remedy that.
I have no knowledge at all on bat detectors but someone showed me one when I was testing my Zoom H1 and it was pretty cool listening to a bat so I was thinking it could possibly be an extra for the Pi Portable Recorder (depending if I use the Audio Injector Ultra 2 though).The sound card is ultrasound because it can output/input analogue frequencies extending up to the ultrasonic frequencies. Such high frequencies require a digital 192 kHz sample rate