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Audio Testing of new SC-1 Solo prototype.... SUCCESS!!!

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SC-1 Mic Preamp NOW ON SALE!!!!

After many months of development, testing, troubleshooting, frustration, problems, and accomplishments... the SC-1 mic preamp kit, PSU-1848 power supply kit and power transformer kits are now available for sale!

Click here to ORDER

Photo of a finished SC-1 mic preamp kit!  (Note: XLR jacks and wires shown on picture not included in the kit.)

Features:
- Low-Noise, transformerless, High-Quality Mic Preamp
- All solid-state design, using chipsets from THAT Corp and Burr-Brown
- Soft-start, slow ramp-on +48V phantom power
- Crystal clear Red LED indicator for phantom power
- Electronically balanced input and output stages
- 12-position Grayhill gain selector switch
- Gain range from +6 to +72dB, in 6dB increments
- Input RFI protection
- Input clamping protection
- Output surge protection circuit
- Output RFI protection
... read more...

Download PDF file of Assembly Guide/Kit Instructions

Related products like the PSU-1848 Power Supply Kit, Power Transformer Kit, Power Control Kit are also available for sale. Click here.

 Thursday, June 05, 2008
Thursday, June 05, 2008 11:11:54 PM (Central Daylight Time, UTC-05:00) ( )



Finally finished wiring the preamp to XLR jacks. Connected to my RP8 active monitor, hooked up a 150-ohm terminated XLR at the inputs to simulate a mic connected, then crank up the gain and volume to max.... and listened....

No hum, no RF buzz... even at 72dB gain setting, and even though it's running and powered by a DC-DC converter PSU and wall wart. Smile

As you can see from the photo, the XLR jacks are right beside the DC-DC converter PSU, and the wires are LAID ON TOP of it!

I am so pleased and happy with this... I can now breathe easily. Oh this is going to be great!!!!

Connected the SC-1 Solo prototype to Channel 1 of my MOTU 828mk2, set the SC-1 Mic Pre gain to 72db max, volume to max, input XLR terminated with 150-ohm (to simulate a mic) and recorded the resulting audio in DP 5.

LISTEN TO THE AUDIO SAMPLE
http://www.fivefishstudios.com/audio/SC1Solo-NoiseTest.mp3

Okay... that noise you're hearing is with the preamp set to 72dB gain.. 72!!!! And volume at max. This is not "hiss" recorded with shorted inputs, or minimum gain...

And to make it even more mind-boggling... all this powered from a WallWart PSU... and a DC-DC converter.

And to visualize what you're hearing...





I am personally amazed. Smile


UPDATE: The spike you see up is most probably 15.734 Khz.... i.e. TV Horizontal Scan Frequency interference. (I do have a 20" TV a few feet away, yeah the old CRT kind of TV).


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