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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, November 17, 2007
Saturday, November 17, 2007 10:05:20 PM (Central Standard Time, UTC-06:00) ( )
I need a way to rapidly test newly assembled boards without soldering any wires on the connection pads.

So I made this test jig. I just plop in the newly assembled SC-1 board, hook up XLR connections, and apply power. If successful, release the board, pack and ship it out.

The breadboard area is for future use... i.e. creating INSERT modules.

This test jig can also be used to test newly assembled PSU boards.





The pogo pins I bought from eBay. These are spring loaded contacts with very fine and very sharp tips. They make contact into the PCB under test, and apply pressure to it for a good, reliable connection.

The yellow PCB holder keeps the PCB under test secure.

Yeah... I'm gearing up for some major assembly work so I can start selling ready-made preamp units in a rack case.

I tested the "Test jig" today using a newly assembled SC-1 kit.

The jig works great. I was able to test the SC-1 preamp without soldering any wires to the PCB, and still having a good, reliable contact on both the power pins, input and output XLR jacks. Pretty pleased with it.

I think I just need to add some "guide posts" so the PCB under test do not sway side-to-side too much even if I'm flicking the selector switches or phantom power switches.

Some photos:






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