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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.

 Sunday, December 23, 2007
Sunday, December 23, 2007 10:19:52 PM (Central Standard Time, UTC-06:00) ( )
Using the DCC-1848 prototype PSU, loaded with my SC-1 preamp, the IO-module and the VU meter board.

0.2V/DIV


0.1V/DIV... you can see some noise/spikes occuring at regular intervals.


Not bad...

And audio samples.
The Setup:
My SC-1 preamp... with an IO-module and VU Meter board. Everything powered by my proto DC-DC Switching PSU... (12Volts input to +/-18, +48V). Preamp outputs going to a patchbay, then going to a MOTU 828mk2 input. Recorded using Digital Performer. MP3 set at 256Kbit sample rate. Preamp, IO-module, VU meter board and PSU unracked, no case, no shielding, no grounding... just PCBs sitting on my workbench.

First sample:... preamp gain set to 54dB, *unterminated XLR inputs*, max volume
http://www.fivefishstudios.com/audio/DCDC54dB0R.mp3

Second sample... preamp same 54dB gain as above, but XLR inputs terminated with 150R resistor.
http://www.fivefishstudios.com/audio/DCDC54dB150R.mp3

Third sample.... preamp gain set to 72dB, *unterminated XLR inputs*, max volume
http://www.fivefishstudios.com/audio/DCDC72dB0R.mp3

Last sample... preamp gain at 72dB, 150R terminated XLR inputs, max volume
http://www.fivefishstudios.com/audio/DCDC72dB150R.mp3

OK! I think I found the problem and managed to reduce the spikes in the DC INVERTING section. I don't know if the pictures make it obvious but it's a definite improvement.

EARLIER


FIXED? Definitely better... reduced noise and pikes.


I think I'm ready to do a revision 2 of the DC-DC Converter PCB, so I don't have components hanging on the top and bottom of the board (was trying out different things). I think the rest of the problem is now caused by the PCB layout.



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