Topic: Custom pre-amp for Sony PCM-D50
Hi, I bought Sony's PCM-D50 mainly to record birdsong. Putting aside the lack of xlr balanced inputs, a rather noisy mic pre-amp and poorly backlit display, I think it is a remarkable piece of kit.
With the first point in mind I looked at buying Sony's xlr-1 interface, but decided against parting with the best part of 260 quid for what amounts to a couple of "audio transformers in a box" plus I didn't fancy my chances with the noisy internal mic pre-amp. However, switched to line input, the D50 is virtually noise free and with this in mind, my attention turned towards making an external pre-amp.
I remembered reading the impressive spec for Analogue devices' SSM2019 self contained pre-amp ic's and with this in mind I set to work. The SSM2019 only requires a few external components to function, obtaining an adequate +/- 15v power supply from 4 AA batteries was realised using a dc to dc converter. With all of this housed in a suitable case (not unlike the xlr-1) hey presto a virually noise free mic pre-amp! I could have added phantom, but as I'm using dynamic mics (no noisy, exaggerated hf response electret mics here) Woah ! it was not necessary. This also allowed direct input coupling.
The net result is virtually hiss free recordings. I have not measured the signal to noise ratio , as it isn't an issue with this set up !
I can provide extra info if required. Cheers. Gordon.