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24324

Re: Button cells for low noise preamp

... Agreed. But I think one of the problems is the common belief that an IC op amp is the answer to a maiden's prayer in all situations. There are simpler
David Pickett
Aug 24
#24324
 
24323

Re: Button cells for low noise preamp

No wind up. If I was a guru in my previous life, it would be a DBLT guru. I've spent a LOT of time hunting for reasons for reliable differences in DBLTs. Of
ricardo_lee
Aug 24
#24323
 
24322

Re: Button cells for low noise preamp

I feel like there's a wind-up here, but... Max412 was similar to the Sony pcm-m10 preamp but a little more hifi, better highs more solid mids and lows. Maybe
w w
Aug 24
#24322
 
24321

Re: Button cells for low noise preamp

In what way does it "sound best"? 49720 IS the same chip as 4562 with the same problems.
ricardo_lee
Aug 24
#24321
 
24320

Re: Button cells for low noise preamp

I read  something about the oscillations already, but just wanted to try the 4562 out and so far there have been no problems and it sounds excellent, probably
w w
Aug 24
#24320
 
24319

Re: Button cells for low noise preamp

I don't recommend LM4562 for LN especially with single supply rails. Caveats at
ricardo_lee
Aug 24
#24319
 
24318

Re: Button cells for low noise preamp

I have been using both the LM4562 and OPA2134 with 9V. On Monday, August 24, 2015 3:07 AM, "ricardo@... [micbuilders]"
w w
Aug 24
#24318
 
24317

Re: Button cells for low noise preamp

What OPAs are you considering? There's not many LN devices that work at +/- 2V5 .. let alone deliver useful output.
ricardo_lee
Aug 23
#24317
 
24316

Re: Button cells for low noise preamp

It is not advisable to discharge CR2035 cells at 12mA, you would be better with a couple of AAA cells.
userno232000
Aug 23
#24316
 
24315

Button cells for low noise preamp

I am interested in using a lower profle battery for the Ricardo preamp. Measured two op amps under load and the current matches exactly the quiescent current
w w
Aug 23
#24315
 
24314

Re: pip for lnprimer circuit

You need to be careful with the Input Loops not to muck up the LN layout with extra wiring etc. Both the datasheet and LNprimer assume the input is at 0V. You
ricardo_lee
Aug 21
#24314
 
24313

Re: pip for lnprimer circuit

Thank you for the reply, much appreciated. -Is there any way to use the same input jacks for cmbi's (battery schoeps) and 3-wire mics? I guess two stereo input
w w
Aug 21
#24313
 
24312

Re: pip for lnprimer circuit

My apologies for not replying sooner. The KE4 datasheet has precise recommendations for best performance. As its already a 3 wire capsule it would be foolish
ricardo_lee
Aug 20
#24312
 
24311

Re: pip for lnprimer circuit

I rewired my sennheiser ke4 caps to what was recommended in their datasheet, built a battery powered circuit and fired it up into ricardo's preamp. I'm not
w w
Aug 20
#24311
 
24310

Knowles SPH0642HT5H for ultrasonic pickup

Hi all, On their website, Knowles has their new top port SPH0642HT5H mems mic listed under their table for ultrasonic applications. However, the app note
Daniel Furuta
Aug 17
#24310
 
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