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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.

 Wednesday, June 04, 2008
Wednesday, June 04, 2008 11:08:43 PM (Central Daylight Time, UTC-05:00) ( )


Oh yea!!! working sweet.

A few misadventures while building it... was in too much of a hurry... I inserted a diode backwards in the 48V section, which effectively shorted the thing... the IC chip and board got a little warm... but no damage.

Desoldered it, and put in a new one, (made sure to install it properly) and now the 48V section works perfectly!

Found a little error in my header jumper... my original intention was using a jumper to activate or deactivate the 48V section (in case the user doesn't need it, will also conserve battery power)... but I miswired it so now the 48V section is always available and it's the split psu section that can be disabled or enabled... dumb backwards! I'll fix this on the next PCB revision.

Connected the 12VDC wall wart... measured 27Volts on the 48V section, adjust the onboard trimmer for 48.05 Volts... and now we have a working +/- voltage rails plus 48Volts output.

But yea, everything is working great. See the little LED lit up? It's a sign that the future looks bright.

I just need to continue to populate the board and complete the testing.

UPDATE:



Finally finished building the first SC-1 Solo prototype using the latest PCB design, and latest DC-DC Converter PSU design.

I haven't passed audio through it yet, but I did some power up testing, measuring voltages, etc... everything looks perfect!

I need to get some sleep. Will do audio testing later.



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