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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.

 Saturday, February 24, 2007
Saturday, February 24, 2007 9:04:28 PM (Central Standard Time, UTC-06:00) ( )
Yes, build your own pads. By pads, I mean "attenuation pad."  These are devices or circuit meant to attenuate or insert a loss in your signal path.

There are 2 kinds of pads you can use... The first is called a "T" pad and is mainly used for unbalanced lines.  The second is called an "H" pad and is mainly used for balanced lines.

We'll be building an "H" pad.



If you want a -10dB attenuation on your signal, use the values 150ohms for Ra, and 430ohms for Rb.  These values are meant for a 600 ohm line, which is the impedance typically used in pro gear.

For other values, see table below:

dB Loss Ra Rb
1 8.2 10K
6 100 820
10 150 430
20 240 120
40 300 12
50 300 3.6
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