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SC-1mk2 and SC-1mk500 Mic Preamp Kits



SC-1mk2 Preamp Kit  SC-1mk500 Lunchbox Preamp Kit 
 Monday, December 28, 2009
TS-2 Rev.B Preamp Redesign
Monday, December 28, 2009 11:04:46 PM (Central Standard Time, UTC-06:00) (  |  |  |  )
A flash of inspiration... I found a smaller footprint output transformer I can use... so I created an Eagle part library for that. (Tip: use a digital caliper when creating part libraries)

After some creative rearranging of parts, and I made this.

This is just the motherboard. Measuring about 6" x 6".


Ch-check it out!

2 Input Transformers - NEW FEATURE
2 Output Transformers - NEW FEATURE
Gain and Trim knob for each channel
2 VU Meters
4 Full size XLRs
Relay Controlled switching - NEW FEATURE
Bigger DC Converters - NEW FEATURE
... and better PCB layout by re-arranging parts.

Also, reduced the number of molex connectors from the original (7) to a single 10-pin Molex! That will be a big time-saver.... plus the use of PCB mounted XLR Neutrik Jacks.

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 Saturday, December 19, 2009
DC-DC Converter How-To
Saturday, December 19, 2009 8:10:27 PM (Central Standard Time, UTC-06:00) (  |  |  )


Maxim offers a great explanation of DC-DC converters.

DC-DC Converter Tutorial

Abstract: Switching power supplies offer higher efficiency than traditional linear power supplies. They can step-up, step-down, and invert. Some designs can isolate output voltage from the input. This article outlines the different types of switching regulators used in DC-DC conversion. It also reviews and compares the various control techniques for these converters.

http://www.maxim-ic.com/app-notes/index.mvp/id/2031

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