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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.
 Tuesday, November 13, 2007
IO-Module
Tuesday, November 13, 2007 10:02:21 PM (Central Standard Time, UTC-06:00) ( )
I'm done deigning the PCB for the IO-module!

Optimized paths and simplified routes, move components around for simpler routing, made sure ground fill is covering as much of the PCB... had to nudge paths a mil here and there.

Design Rule Check and Error Check reports 0 errors, 0 warnings in the PCB design. That's always a nice thing to see Smile

I just now need to clean up the text and part#s so they don't overlap and are easily readable on the PCB silkscreen.

I designed a logo for FiveFishStudios. My goal is a simple design that can be etched/milled/CNC'd easily. (looking forward to getting my own CNC machine to do custom cases in-house)

Here's a photo of the new logo. It's a fish, and a sine wave. And the fish is made from normal and inverted sine wave... kinda like a balanced line.. opposite polarity on each line. The fish eyes remind me of solder pads on PCBs.




BYW, this is just Rev1.00... prototype.

I'm still deciding about that output transformer that can be made switchable in/out by simple switches (instead of jumpers).

That "little" feature will add (2) relays, another switch, and on-board regulators to bring down the 18Volts supply to 12V (or 5V) to power the (2) relays... and also increase power draw on the PSU. And I'm thinking if all that is worth it for something that may or may not get used a lot in the field by majority of people.


As I said, this is only Rev1.00 PCB... using relays will definitely shorten the signal path around the PCB... which is always a good thing. I am concerned about the signal path travelling from the XLR jack to the IO-module, before reaching the SC-1.

But then again... that same signal just came from 50ft or 100ft of mic cable from the source, so maybe a few inches of extra travel (via the IO-module) is not really a big concern.

The schematic for the IO-module is done... I forgot I had this finished, but haven't tested a few sections of it in real life... well, tonight I got to test the output trafo with the SC-1... and tested it also with both the input and output trafo... MAN!!! IT sounds really great! I dig it.

Anyways, I've finally decided on the input and output trafos.... THIS IO-MODULE WILL BE AWESOME!!!! REALLY!

I've designed this IO-MODULE so it can be used for a future FiveFish preamp model... i.e. re-use the IO-MODULE with a different main preamp board... voila... a new preamp model/design. i.e. It will be modular in approach.

So guys... WATCH OUT FOR A FUTURE PREAMP PRODUCT FROM FIVEFISH!... more likely will happen after the IO-MODULE gets out the door and is in production.

Finished. But I don't want to send it out yet for PCB prototype manufacturing. I want to wait until the output trafo I ordered gets here so I can test fit it on the PCB printout.

So far, everything looks good. Size is 4.5" x 3.5". All switches and DI jacks are PCB mounted... both input and output transformers are also PCB mounted.

I'm using Molex connectors for the Power connection, and for hookups to the SC-1 board. There is also an extra power connection so you can wire the SC-1 board to the IO-module instead of running power lines all the way to the PSU.

So it will be PSU ----> IO-Module -----> SC-1



The two switches are the polarity invert switch, and the mic/instrument select switch.

The 1/4" jack is for guitars/bass, Hi-Z instruments. Yes.. it's a built-in DI circuit! And not just any DI... the output of the DI circuit goes to a balanced converter, then to the input transformer... to give it that additional flavor! I mean, it's an expensive trafo... why not use it! It's probably overkill. But I think it will sound nice. I've breadboarded it and I like the sound. Very quiet too.

I added a -20dB PAD... reduce width to 3.00" and extended length.



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diy silk screen pcb (search.yahoo.com) [Referral]
"fivefish preamp" (uk.altavista.com) [Referral]
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