« Reply #21 on: January 05, 2006, 07:04:12 PM »
you may want to check this, a plug-in powerered, 20dB booster. I own one and works ok
http://www.felmicamps.co.uk/products/fel3.5series.html
i am not the smartest one here... but arent those things just modded transformers (e.g. Hosa MIT-176)... if so you are getting reamed for them... hosa transformers are about $30 each
I'm just guessing here, but I think these are actually premps (very low voltage opamps?) running off of the plug in power. They also sell versions that run off phantom power (eg., step 48V down to 10V or so, and run opamps off this).
FWIW, you can't use transformers on just anything. You need a low-impedance source, either a dynamic mic, or a condenser mic *with* a phantom power adapter (that has a current boosting circuit inside). If you just try to put a battery box output into a transformer, it will not provide any voltage gain. (I tried it!!!) The reason is that electret mics themselves are pretty high impedance already.
The only exception is DPA 406x mics. They *claim* to be low impedance output (probably using some boosting circuit right in the mic body). Has anyone tried transformers on these?
Richard
Logged
Mics: Sennheiser MKE2002 (dummy head), Studio Projects C4, AT825 (unmodded), AT822 franken mic (x2), AT853(hc,c,sc,o), Senn. MKE2, Senn MKE40, Shure MX183/5, CA Cards, homebrew Panasonic and Transsound capsules.
Pre/ADC: Presonus Firepod & Firebox, DMIC20(x2), UA5(poorly-modded, AD8620+AD8512opamps), VX440
Recorders: Edirol R4, R09, IBM X24 laptop, NJB3(x2), HiMD(x2), MD(1).
** This individual has moved to user "illconditioned" **