Schematics isn't a mystery since long time..... Wayne has pubished a blank version, but...... 😱
Did this Mr. White have long white hair, and normally seen in a black T?
He's a funny guy with a good ear.
He's a funny guy with a good ear.
Pearl Two ready
OK I have finally built and tested the production Pearl II boards.
Looks good. We will be ready to ship as soon as we figure out cost and how $ to lose on each one. Kit will be both boards and the semiconductors.
EQ curve is like the original Pearl within +\- .15 dB gain is higher at 52 dB.
Front end gain is 35 dB and 40 dB secondary with about -20 dB EQ loss.
The gain is higher than Pearl and can go even higher.
More to follow.
OK I have finally built and tested the production Pearl II boards.
Looks good. We will be ready to ship as soon as we figure out cost and how $ to lose on each one. Kit will be both boards and the semiconductors.
EQ curve is like the original Pearl within +\- .15 dB gain is higher at 52 dB.
Front end gain is 35 dB and 40 dB secondary with about -20 dB EQ loss.
The gain is higher than Pearl and can go even higher.
More to follow.
Did any values change for the invisible schematic?
Looking forward to the update when boards are in the store.
Looking forward to the update when boards are in the store.
Would balanced output be possible?
Please excuse me if this is a stupid question, but I am interested in building a phono stage with balanced output. Would it be possible to perhaps use two boards and have a balanced output with the Pearl II?
Thank you so much for making your work available to DIYers. It is great to have such well designed and supported projects to work on. I enjoyed building and using the B1 and I look forward to the Pearl II.
Aaron.
Please excuse me if this is a stupid question, but I am interested in building a phono stage with balanced output. Would it be possible to perhaps use two boards and have a balanced output with the Pearl II?
Thank you so much for making your work available to DIYers. It is great to have such well designed and supported projects to work on. I enjoyed building and using the B1 and I look forward to the Pearl II.
Aaron.
The ONO has an additional inverter to make a second output.
A real balanced out is annother thing.
Reinhard
Thanks, I was just curious. I'm sure it will sound great single ended, and it will be cheaper to build ; ). Ultimately I would like to build a balanced phono pre, but I would love to build the Pearl II even if I can't make it balanced. There don't seem to be a lot of true balanced designs for phono preamps available to the DIY community, it must be a difficult to design and implement. Thanks for taking the time to respond.
Aaron.
Aaron.
The difficulty is that they don't make balanced cartridges, and
without a center-tap ground, the problems with input common
mode noise render it impractical unless you use an input
transformer.
😎