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TS-2 Rev.B Preamp Redesign Part 3
TS-2 Rev.B Preamp Redesign Part 2

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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!

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Photo of a finished SC-1 mic preamp kit!  (Note: XLR jacks and wires shown on picture not included in the kit.)

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- Electronically balanced input and output stages
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Related products like the PSU-1848 Power Supply Kit, Power Transformer Kit, Power Control Kit are also available for sale. Click here.
 Monday, December 28, 2009
TS-2 Rev.B Preamp Redesign Part 3
Monday, December 28, 2009 11:04:05 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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TS-2 Rev.B Preamp Redesign Part 2
Monday, December 28, 2009 11:03:22 PM (Central Standard Time, UTC-06:00) (  |  )
My parts arrived for my TS-2 prototype. I ordered the parts so I can judge their quality and size, get dimensions and pin spacings so I can create Eagle part libraries for it.

I Found a 4-LED vertical, PCB mount, Right-Angle part. I think I'll use this for the VU meters for the new TS-2RevB. I wish it was a 5-LED device, but 4 will do.

Also, I'm beefing up the DC-DC converter. It only cost a few dollars more than my previous converter, and a big step up in power, so why not? Plus, I have the real-estate board space for it.

The 48V section DC-DC converter is home-grown, developed here in FFS Lab. That will remain unchanged. I think I'll just add some overvoltage protection.

Larger filtering caps will be added too.... again, thanks to the bigger board space.

I'm thinking of adding relays for polarity reverse functions, but a non-latching relay will be consuming power while engaged, and that will be a drain on the battery. A better solution is to use latching relays (they only consume power when changing states), but controlling those will be more complicated than a simple relay. So this is still up in the air.... or maybe I should just get rid of the polarity switch? < what do you think? >

On the original TS-2, there is a switch to turn on/off the VU meters to conserve battery power. What if this switch is instead used as a High Pass filter? Then again, this will be another relay to control. ... which will affect power consumption, etc... Plus, a single switch will be controlling 2 HPF channels? That doesn't sound right.

The compromise decision making process is driving me nuts.

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