Topic: putting line transformers inside a batt box -- please help (DPA4061 related)

[relaxing]

Muchas Gracias!

I'll be taping band practice tonight, so I'll let you know how this works out.  I noticed the specs for the transformers was something like 300Hz - 10kHz so we'll see just how nonlinear it gets outside of that range.

[Lil Kim Jong-Il]

Muchas Gracias!

I'll be taping band practice tonight, so I'll let you know how this works out.  I noticed the specs for the transformers was something like 300Hz - 10kHz so we'll see just how nonlinear it gets outside of that range.

+T for DIY.

Once you get the circuit working, you can always substitute better components later - upgraded transformer and some auricaps for the signal path. 

[relaxing]

well, the good news is:
1. my homemade battery box seems to be working well.
2. the transformers did provide +5 dB gain

the bad news?
1. The transformers suck.  They completely trash the signal with what I would call a comb filtering effect, leaving the recording sounding hollow. (I can provide frequency graphs if anyone's curious.) 
2. 5 dB gain is not enough.

Granted, these are ratshack parts, so suckage is to be expected.  If anyone can help me find higher quality components from someplace like Mouser, I'd try it again.  But I believe I need an active preamp for the 4061s.

[Evil Taper]

What's the big deal with boosting the signal during post work?

[shaggy]

If you don't put enough signal onto the tape, you are effectively making a 12 or 14bit recording.

ANDY

[Evil Taper]

This true with the JB3 also?

[relaxing]

This true with the JB3 also?

It's true with any A/D conversion.  "16 bits" of CD quality refers to 2^16 possible volume levels for each sample.  If you only supply it with volume levels up to, say, bit 12, then you're  wasting the upper 4 bits and making a lower-quality recording.

[Lil Kim Jong-Il]

If anyone can help me find higher quality components from someplace like Mouser, I'd try it again.  But I believe I need an active preamp for the 4061s.

Jensen www.jensen-transformers.com
Reichenbach  http://www.cinemag.biz/line_input/line_input.html

Digikey has a long list of broadcast quality audio transformers last time I looked.

[Evil Taper]

When someone gets this problem fixed I'd be very interested in a step by step how to.  What is up with JK Labs though...he's awol.

[relaxing]

If anyone can help me find higher quality components from someplace like Mouser, I'd try it again.  But I believe I need an active preamp for the 4061s.

Jensen www.jensen-transformers.com
Reichenbach  http://www.cinemag.biz/line_input/line_input.html

Digikey has a long list of broadcast quality audio transformers last time I looked.

Yeah but I have no idea what specs I'm looking for.