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Old 5th November 2010, 04:33 AM   #1
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Default Simple & Low Distortion DIY PreAmp

Greg,

As this category is more appropriate for discussion of pre-amp, I moved the thread here.

Schematic and Micro-Cap simulation result were shown.

63307-B.jpg

63307-FINAL.jpg

Please take a look and give comments.

Thanks,

circuitscc
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Old 11th November 2010, 03:51 AM   #2
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Greg,

If you are using MPS8099/8599 for the input differential pairs, change
R3 R8 R33 R38 to 1K
R7 R12 R37 R42 to 12k
R4 R9 R34 R39 TO 120R

This combination will reduce 3rd harmonic to less than 0.001%.

Regards,

circuitscc
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Old 20th December 2010, 04:05 PM   #3
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Here is the bottom trace and top silk screen.

Any comment?

I made a sample order of this PCB. The boards will arrive very soon.
Attached Files
File Type: pdf 63307-B.pdf (60.9 KB, 144 views)
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Old 20th December 2010, 06:54 PM   #4
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Where is the original desing with parts values ??
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Old 20th December 2010, 08:15 PM   #5
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Schematic, PCB layout, BOM and special instructions will be shipped together with each PCB (no components).

It is a 2-layer PTH, high definition (no kidding, money back guarantee) FR4 lead-free design with 2-oz copper (most computer motherboard is 0.5 oz). Silkscreen printed on BOTH sides.

Each PCB contains 2 channels, +/- voltage regulators and rectifiers.

Tracking information from UPS indicates the boards will arrive on Dec 22.

Price per board is USD15 (bare PCB only).
If you need the 4 pcs of Cooper Bussmann terminal blocks, which may be difficult to source in some countries, please add USD3.

Shipping within the US is USD3 for any number of boards you buy.
Shipping to overseas is USD5 per shipment for any quantity bought.

You can send payment to my PayPal account circuitscc@gmail.com

63307-B tss.pdf

63307-B bss.pdf
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Old 20th December 2010, 10:00 PM   #6
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Maybe this ad should be moved to a more appopriate section.
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Old 20th December 2010, 10:09 PM   #7
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Analog_SA,

You are right. It will be moved to vendors' forum eventually.

Thanks a lot!
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Old 20th December 2010, 11:28 PM   #8
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Ok now I see ...
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Old 21st December 2010, 02:35 AM   #9
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Please note that discussion of this thread has moved to :

Simple Mirror Type PreAmp with Low Distortion

Sorry for any convenience.

Regards,

circuitscc
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Old 2nd May 2011, 01:54 AM   #10
Rush is offline Rush  United States
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Default JFET Active Crossover

I was wondering if there was any chance you want to make a PCB for this active crossover and power supply: JFET Active Crossover

Rush
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File Type: gif Crossover fetcross1 PN4393.gif (30.3 KB, 204 views)
File Type: gif Crossover power supply fetcross2.gif (10.4 KB, 204 views)
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