I had been too. I don't know if it's recent or if I just didn't notice previously, but blue specifically seems to have jumped up with 2oz copper at both PCBWay and JLCPCB. So... I might actually swap to another color. Red, Black, Green, and Purple didn't have the crazy bump last time I checked. Did you notice a bump in blue pricing?
Gary... I was leaning black too. I've got the red BA-3 boards, Randy's boards are Purple... hmmmmm.....
I use this product here in Australia, not sure if it is available in the US though.
https://www.chemtools.com.au/product/our-brands/kleanium/circuit-board-cleaner/
Otherwise, this is about the best but expensive here.
https://docs.rs-online.com/f428/0900766b8131b8ad.pdf
https://www.chemtools.com.au/product/our-brands/kleanium/circuit-board-cleaner/
Otherwise, this is about the best but expensive here.
https://docs.rs-online.com/f428/0900766b8131b8ad.pdf
Just checked pricing at JLCPCB, if you want 2 ounce copper than green is the way to go. All of the other colors with 2 ounce copper more than double in price for some reason.
All colors in 1 ounce are $10.00 for 5 pcb's.
Green in 2 ounce is $27.40 for 5 pcb's.
Blue, purple, yellow, white and red in 2 ounce are $59.79 for 5 pcb's
Black in 2 ounce is $75.99 for 5 pcbs. (ouch!)
All colors in 1 ounce are $10.00 for 5 pcb's.
Green in 2 ounce is $27.40 for 5 pcb's.
Blue, purple, yellow, white and red in 2 ounce are $59.79 for 5 pcb's
Black in 2 ounce is $75.99 for 5 pcbs. (ouch!)
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If anything, this one sounds more coherent than the breadboard version. The Diamond buffer circuit seems to benefit from a PCB implementation , better connection and power supply bypassing.
The whole amp runs better in this chassis. The dual-mono PSU is the best that I know how to build. It is absolutely silent.
The Diamond buffer seems to have a synergistic relation with the high transconductance Mosfets. The NOS Fairchild FQH44N10s have performed without fault. I would suggest that the group buy a tube of 30 and share among yourselves.
The power supply:
Transformers are Antek AS-3222
Boards are dual-rail SLB, enhanced with bipolar transistors selected for lower Vcesat. This allows the output voltage of the capacitance multiplier to be set closer to the voltage from the synchronous rectifiers. Mosfets used in the sync rectifiers are IPP040N06N.
The SLB boards are followed by Kemet 10,000 uF caps on each rail. This is vital. The seller of the SLB claims no output caps are necessary, but this is not the case.
The Anteks are bolted to 1/4” slabs of Acrylic, which are in turn bolted to the bottom plate. The donuts have rubber stoppers to isolate them from the steel mounting bolts.
Transformers are Antek AS-3222
Boards are dual-rail SLB, enhanced with bipolar transistors selected for lower Vcesat. This allows the output voltage of the capacitance multiplier to be set closer to the voltage from the synchronous rectifiers. Mosfets used in the sync rectifiers are IPP040N06N.
The SLB boards are followed by Kemet 10,000 uF caps on each rail. This is vital. The seller of the SLB claims no output caps are necessary, but this is not the case.
The Anteks are bolted to 1/4” slabs of Acrylic, which are in turn bolted to the bottom plate. The donuts have rubber stoppers to isolate them from the steel mounting bolts.
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