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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.

 Friday, November 16, 2007
Friday, November 16, 2007 10:14:11 PM (Central Standard Time, UTC-06:00) ( )
Caught a stupid mistake... the DPDT push button switches were too far out. So I pushed it back in... not too bad, there's plenty of space on the board so it was not a major re-layout.

I also sent the PCB out for prototype manufacturing. So now... we wait.

When I get the (5) prototype boards back, I'll try (2) different input trafos on it. And may also try different output trafos.



I try to make is possible that every square area of the PCB is covered in ground plane. It helps reduce noise. Either there is ground plane covering on the top, or bottom, or both. The ground kinda acts like a shield.

There is one thing bugging me on this design and that is the 2 pcb traces crossing the circular transformer on the top copper layer. I tried to find some other routes, but it's either I'll have to increase the width of the PCB, or reduce the trace width... both of which I dont want to do. I guess I can also run it around the board, but these traces are carrying low level mic signals, I don't want it winding around the board. so off straight they went... passing and crossing under the future location of the input transformer. We'll see how it goes.

Because this board can be used for other preamp modules coming out in the future, I made the output trafo flexible in its wiring. There are solder pads on the PCB so you have the option of wiring it 1:1, 1:2, 1+1:1+1... whatever. Or you can even use a chassis mount trafo, and just run flying wires to the board.


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