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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.

 Monday, January 01, 2007
Monday, January 01, 2007 11:35:38 PM (Central Standard Time, UTC-06:00) (  |  |  )
This is a repost of my SSL Build Thread. Thanks to Gyraf.dk for the schematic plans.

The compressor is a clone based from the SSL4044E desk (1985 era). The SSL mixbus is actually an integrated part of the desk's main quad fader and autofade system. Click here for schematics.

There's been some mods to the original schematics for use with THAT VCAs. This page contains adjustments to the resistor values.

I also did some mods on my unit. Mainly, adding transformers at the output. Originally, the unit uses opamps for balanced outs. I have some MCI 416 output trafos that I used for my SSL unit.

The PCB...



Screenshot of my PCB stuffed with components. A few missing parts but almost there.




Building the rack case. Drill holes, and file a rectangular hole for the VU meter (ammeter).




Assembling the rack case and making sure all the parts I need to start the Final Build are complete.


There is a daughterboard that contains the selector switches for the RATIO, ATTACK, RELEASE selectors.






Wiring the balanced outputs. (The transformers are not yet included in this photo.)



You can also see the Toroidal transformer for the power supply unit.




Finished unit.

It sounds so good, I built a 2nd unit.



I used a digital caliper to make sure the locations of knobs, switches, vu meters are identical on the 2nd unit.

Of course, we need some obligatory sound clips. I used the raw outputs from an Emu XL-7 synth to the SSL compressor, then to the audio inputs of my 828mk2.

The first thing you'll hear is the uncompressed signal for approx 15 seconds, followed by the compressed signal. At around 28seconds, I switch it back to uncompressed. Click on the waveform to listen.


http://www.fivefish.net/diy/ssl4000compressor/audio/sslcompressorsample.mp3
Comments | Trackback | # 
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