Henry,
OSH Park boards are pricey but their quality is excellent. This forum should have a board of the month competition. 🙂
Granted acid trap issues are less today but I seen relative recent examples in some off shore boards, usually a with very thin traces (10 mils and under).
Links below for a couple of excellent articles about proper pcb layout guidelines for those that might be interested
https://www.protoexpress.com/blog/dfm-issues-pcb-manufacturing/
https://www.ema-eda.com/about/blog/seven-dfm-issues-potentially-lurking-your-pcb-design
...............then again maybe I am a bit too anal. 😗
Jam
OSH Park boards are pricey but their quality is excellent. This forum should have a board of the month competition. 🙂
Granted acid trap issues are less today but I seen relative recent examples in some off shore boards, usually a with very thin traces (10 mils and under).
Links below for a couple of excellent articles about proper pcb layout guidelines for those that might be interested
https://www.protoexpress.com/blog/dfm-issues-pcb-manufacturing/
https://www.ema-eda.com/about/blog/seven-dfm-issues-potentially-lurking-your-pcb-design
...............then again maybe I am a bit too anal. 😗
Jam
Last edited:
Anal is good. I moved two electrolytic capacitors yesterday one thousandth of an inch because I wasn't satisfied with their positions. But sometimes you have to say, "It's good enough." Many, many half-built model airplanes from my past ended up in the trash because I got depressed that they weren't coming out perfectly. As a friend told me, "You can't see the building errors when the plane is in the air."
You should always strive for excellence not perfection............................
There is a difference between striving for excellence and striving for perfection. ... The dictionary definition of excellence is "to surpass", it is "the quality of being outstanding or extremely good". So when you strive for excellence you are always looking at where you are and how you get a little bit better.
People who strive for excellence can accept that mistakes are inevitable and value what they learn from them. They dont let mistakes define them.
But perfectionists see mistakes as evidence of their inadequacy or inferiority. They expect themselves to know everything, to out-perform everyone, to always know the right thing to do or say, to be above reproach, and never let anyone down. This is not only unrealistic, its a heavy burden to carry.
Just some food for thought.
Jam
There is a difference between striving for excellence and striving for perfection. ... The dictionary definition of excellence is "to surpass", it is "the quality of being outstanding or extremely good". So when you strive for excellence you are always looking at where you are and how you get a little bit better.
People who strive for excellence can accept that mistakes are inevitable and value what they learn from them. They dont let mistakes define them.
But perfectionists see mistakes as evidence of their inadequacy or inferiority. They expect themselves to know everything, to out-perform everyone, to always know the right thing to do or say, to be above reproach, and never let anyone down. This is not only unrealistic, its a heavy burden to carry.
Just some food for thought.
Jam
Interesting subtopic, good advice. I try to make things "perfect" if I can, but not to the point of being neurotic about it.
Just remember why people "hear" what they think they hear, also known as perception. It may just save you money and time.
A quick status note. I went back to work (in the next room, LOL) today after being on a four-month leave of absence. Updates may be less frequent for a bit, but I plan to keep the project rolling and hope to get a prototype running in the not-to-distant future. Thanks for all the interest and support.
Last edited:
"I am altering the deal. Pray I don't alter it further."
Haha, JK. I have my priorities (hobbies come first). This is just a temporary slowdown while I play catch-up at work.
Haha, JK. I have my priorities (hobbies come first). This is just a temporary slowdown while I play catch-up at work.
Ok, let's add:
1. Murata 78602 3-wire common mode choke at the output.
2. 330 Ohm/5W at each mains wire before trafo and 1 uF in parallel to primary winding.
1. Murata 78602 3-wire common mode choke at the output.
2. 330 Ohm/5W at each mains wire before trafo and 1 uF in parallel to primary winding.
Reasonable suggestions, thanks. I will consider experimenting with this once I have the amplifier up and running.
Um...Best to let it burn-in with its proper power supplies for a month before experimenting with changing the sound. Just sayin' ...my personal opinion only.
It's funny how work can be a distraction. Why in the world I choose to work when I could spend all day surfing the web and designing headphone amplifiers is anyone's guess. Oh wait: salary and health insurance. Never mind.
I told myself I wasn't going to ask for layout advice, but I'm going to do it anyway. The two long vertical traces connect the front end to the OPS gate resistors. I can even things up at the cost of two tee junctions as shown below. As I said before, I'm not really opposed to tees, and the signals don't care at audio and low RF frequencies, but it's supposed to be bad style. So I throw this question out for opinions, do you think this is an improvement?
I told myself I wasn't going to ask for layout advice, but I'm going to do it anyway. The two long vertical traces connect the front end to the OPS gate resistors. I can even things up at the cost of two tee junctions as shown below. As I said before, I'm not really opposed to tees, and the signals don't care at audio and low RF frequencies, but it's supposed to be bad style. So I throw this question out for opinions, do you think this is an improvement?
Evenharmonics, I am having a high stress week. It would really mean a lot to me if you'd leave my happy little thread in peace.
Thanks, man.
Thanks, man.
Thanks very much for the suggestion. The thing is, I'm trying to cultivate a happy thread here and if there's an off-topic grudge match going on, that may discourage other people from joining, which would be a shame. I hope you won't take this as a sign of disrespect, but the subject you're trying to debate doesn't really fit in with the topic of discussion here. I'm sure now that I've explained it, you will understand and find another thread more fitting to your interests. It would pain me terribly to think I had missed an opportunity to save you from wasting your time and energy, posting comments no one is interested in reading.
I hope this helps! 🙂
I hope this helps! 🙂
I'm not super-confident of my ability to hear the effects that other audiophiles report, and of course there's always The Debate, which will continue long after all of us are gone (assuming hi-fi is still a thing in the future). It seems to me there are good technical reasons to put filters on EMI ingress points, but also reasons not to, especially if there's no actual problem. It's a reasonable thing to try at some point, but definitely not until getting a handle on the baseline amplifier sound quality.
Evilharmonics, eh pardon me, Evenharmonics (yeah, my subconsciousness knows the truth), your personal agenda against Markw4 is ruining every thread where you appear and post your bull-chips comments and attacks. You make zero contribution to any discussion but you fanatically follow Markw4 to any thread where he posts anything and you constantly attack him and other thread participants, with no real arguments.
It’s very rude to continue with your off topic thread littering, while politely asked more than once, to leave thread on topic.
diyAudio would be a much better place without such pure troll behavior. Don't bother to reply. I renewed my ignore list. 😀
It’s very rude to continue with your off topic thread littering, while politely asked more than once, to leave thread on topic.
diyAudio would be a much better place without such pure troll behavior. Don't bother to reply. I renewed my ignore list. 😀
Since no one objected to my proposed PC board change, I've decided I will go with the new scheme. At this point, it's more playing games for appearance than anything else. I will make one last check, then order boards, possibly today. Tonight if I have the energy I will create a BOM and order the passive parts I need (as mentioned before, I have all the semiconductors already). I think I'll just go with JLCPCB, so in principle I could have a board ready to test within a week and a half or so.
Hmmm, I need to decide on power transformers. My bench power supply is rated for +-20V, and can do a little more, so enough for testing.
Hmmm, I need to decide on power transformers. My bench power supply is rated for +-20V, and can do a little more, so enough for testing.