470 ohm resistors were placed where the 47 ohm resistors should have been.
I just happened to check each resistor on the board when I replaced the 9610,MJE 350, and the 840. Was I surprised to read 470 instead of the 47 marked on the resistor. The resistors were grey IRCs
Works perfectly now
Thanks
Bob
It put it in very low Ib in the BJT error amp, cut out, and burst in oscillation too, probably. Should have got hot and collapsed. You can never be too careful with parts values. Good luck from now on, and watch high voltage. Always probe with one hand in the back pocket.
Another diode question. Can't find any 1n4172. Is it a typo?
Also for the Salas for I/V stage....what should I buy for the 4A diode. Is the 2A/800V a 1n5819 or 1n5062? Thanks.
Also for the Salas for I/V stage....what should I buy for the 4A diode. Is the 2A/800V a 1n5819 or 1n5062? Thanks.
1n5842 you can use Zenen diode 12V
Im sorry
1N5819 Schottky Barrier Rectifier .40V not 2A/800V
this DATA:
http://www.oup.com/us/pdf/microcircuits/students/diode/1n5817-fair.pdf
Quanghao, it seems that the first BOM had some mistakes and typos... Do you have an updated and corrected BOM?
I'm sure it would save a lot of questions and problems.
Thanks!
I'm sure it would save a lot of questions and problems.
Thanks!
Hi all,
I´m also wanted a updated list of the parts and the schematics of the last 2 PCB version.
Especially the power supply for I/V have changed.
You shows several typ of tubes for use:
6H6 B+ 270V
6H30 B+ 230V
6DJ6 B+ 200V
The power supply can regular 200V to 270V?
What is with the E182cc version with transformer, have news or schematics?
Klaus
For anyone looking for oscon's, I've found a site that has the SP and its cheaper than Farnell. They'll be getting more stock sometime next week. Check them out Distributor of Display & Computer Products, Capacitors, ICs and Laser Diodes - Semicom Visual.
I had also suggested that we start a new thread for builders of the most current DAC. When new posts are made it's always a pain trying to figure out which version of this project and boards the question is pertaining to.
Instead of this ALL IN ONE thread we should have a thread for each project ,add-on or new version of boards. The last thing we need is confusion when dealing with high voltages and high end parts.
Seems logical to me... anyone else?
Instead of this ALL IN ONE thread we should have a thread for each project ,add-on or new version of boards. The last thing we need is confusion when dealing with high voltages and high end parts.
Seems logical to me... anyone else?
I know I am confused.
I have attached a PDF of the transformers that Gary has asked for, for the version he is building. I have also forwarded this to the four people who have asked to join in a group buy.
Bud
I have attached a PDF of the transformers that Gary has asked for, for the version he is building. I have also forwarded this to the four people who have asked to join in a group buy.
Bud
That's a great idea. I just got my board and I'm not clear if some of the parts are incorrect or need updating. I don't want to order without knowing.
I'd be happy to start the thread but if Quanghao isnt on side we go from the oven to the fire with updates and info all over the place... In my opinion this is Quanghao's responsibility.
UPDATED BOM AND SEPERATE THREAD FOR LATEST DAC QUANGHAO
Please and thank you!
UPDATED BOM AND SEPERATE THREAD FOR LATEST DAC QUANGHAO
Please and thank you!
Gary (Pharod) told me he is not using the Quang Hao I/V pre, using his own project, therefor have different trafo parts.
Klaus
So I have to buy two boards. Add components and perhaps two transformers? There are items that I cannot find through digikey or mouser. Anyone interested in putting a BOM together?
If someone will post the actual voltage requirements for the groups needs, then those will become the transformers provided. Gary has just informed me that his design is not the one the rest of you are going to build.
As I said, I really am confused! However the transformers that Klaus asked about in a PM are not vastly different from what is already designed and combining low voltage 9vac windings with higher voltage windings is not difficult.
Bud
As I said, I really am confused! However the transformers that Klaus asked about in a PM are not vastly different from what is already designed and combining low voltage 9vac windings with higher voltage windings is not difficult.
Bud
Hi Bud,
the other two PT´s I asked in the PM one is for the I/V stage of this DAC, the other is for D3a Phono Pre of Quang Hao in an other thread.
Klaus
- Status
- Not open for further replies.