FS: PreAmp with Complimentary JFET Diff input & JFET ouput - Page 2

USAcircuits · 16th June 2011, 01:52 AM

The board contains 2 channels with power supply.

Copper thickness is 2-oz (70µm) for excellent signal & current conduction.
This is usually thick for a preamp. Your PC video card is 0.5-oz (17.5µm).

White silkscreen for component side and yellow for bottom.

eDSC_6419.jpg eDSC_6433.jpg
Component side.......... Solder side with yellow silkscreen

Regards,
US Audio Circuits

Deep Horizons · 18th June 2011, 01:58 AM

Interesting design. I see the CPR is 2010, but would you have any on hand? And if you did, for how much?

barmanekm · 21st June 2011, 11:02 AM

This design was invented by Erno Borbely in one of the Audio Amateur or Glass Audio issues few years back. It was not permitted for commercial use. But Erno sometimes sells his design to other companies. Anyway most likely this design is not patented by him, but even in such case is nice to at least include information about original inventor. :/

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16th June 2011, 01:52 AM	#11
USAcircuits diyAudio Member Join Date: Mar 2011 Location: East Coast	The board contains 2 channels with power supply. Copper thickness is 2-oz (70µm) for excellent signal & current conduction. This is usually thick for a preamp. Your PC video card is 0.5-oz (17.5µm). White silkscreen for component side and yellow for bottom. eDSC_6419.jpg eDSC_6433.jpg Component side.......... Solder side with yellow silkscreen Regards, US Audio Circuits

18th June 2011, 01:58 AM	#12
Deep Horizons diyAudio Member Join Date: Apr 2010	Interesting design. I see the CPR is 2010, but would you have any on hand? And if you did, for how much?

21st June 2011, 11:02 AM	#13
barmanekm diyAudio Member Join Date: Nov 2009 Location: Kraków	This design was invented by Erno Borbely in one of the Audio Amateur or Glass Audio issues few years back. It was not permitted for commercial use. But Erno sometimes sells his design to other companies. Anyway most likely this design is not patented by him, but even in such case is nice to at least include information about original inventor. :/

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