I bought some from aliexpress. The vendor was a nice guy who didn't know what they were and he gave me a refund. the only time I bought semis from a non reputable vendor. I have heard that the Chinese govt is clamping down on counterfeiting, which is good news for everyone.
Enjoy DIY spirit hobby or clone design of commercial J2 products ?
You share boards with dimensions who are made specialy for business of fake FW chassis and make Group Buys....
pcb´s and chassis are ready made by machines in China not Mr. JeffYoung passionate DIYer
hands work for him self one amplifier piece..that is the truth.
Spot on
Where's the button to delete the fake news and conspiracy theories?
Give me detail and insights on the J2, please. I think it's great how Nelson laid out some bread crumbs and there's been an incredibly creative effort over the space of 10 years to work up some hardware to emulate the Master. That's what's got my focus.
Enjoy.
Give me detail and insights on the J2, please. I think it's great how Nelson laid out some bread crumbs and there's been an incredibly creative effort over the space of 10 years to work up some hardware to emulate the Master. That's what's got my focus.
Enjoy.
It's allowed to organise pcb Group Buys for amps build who are consciously made for an illegal counterfeit copy
of original First Watt enclosures ?
A new trend on the forum ?With the Moderators blessing ?
Counterfeit is when you build something to be indistinguishable from the original, and try to sell it as a real one.
If you build something in your basement for your personal enjoyment, even if you push as far as building it in a case that look like the original, i don’t see counterfeit, i see DIY
I'll take a stab at this. The feedback loop for the auto-bias is measuring the combined current from the CCS and output device. So at first blush it should auto-correct for any mismatch.
However, the distortion profile is at least partly influenced by the ratio of current being sourced from the CCS and output device, so large auto-corrections would change that. I therefore think you want to match them, although critical matching is probably not required.
That's my guess, anyway.
Cheers,
Jeff.
There are some rules here on DIYAUDIO and some mods to have an eye on it. There is Nelson Pass, who is probably the owner of the design. I consider these mods and Nelson the right people to pop in and/or take action against anything that is not within the rules and Nelson's business interest.
So why should we start judging other fellow's behaviour?
I really can't understand what the base therfore could be.
So let us come back to the topic.
So why should we start judging other fellow's behaviour?
I really can't understand what the base therfore could be.
So let us come back to the topic.
So do these PCBs work with the established UMS?
https://cdn.shopify.com/s/files/1/1006/5046/files/universal-mounting-specification-v2.1.pdf
https://cdn.shopify.com/s/files/1/1006/5046/files/universal-mounting-specification-v2.1.pdf
Still struggling with this.
On the first reading I missed the part about the "fixed drain resistor". That's the resistor in the positive leg of the LTP, right?
The voltage gain of a common source amplifier is proportional to Rd / Rs. Rs, because it's a CCS, is nearly infinite, right? So a small change to Rs should make no change in the gain.
But if Rs is really nearly infinite then a small change to Rd won't make any difference either.
So is this where we need to abandon "nearly infinite" and find out what the impedance of the CCS actually is, or do I have the wrong end of the stick?
Cheers,
Jeff.
No. They're designed to go on a flanged heatsink (a la the Sony VFET amplifiers, or Conrad's flanged heatsinks, etc.).