cmsajith
Well-Known Member
Sachin, Please count me too for the GB (full kit). Also could you please arrange a pcb for the CNC (btw, do you have a cnc pcb with the same build quality as B1 pcb?)
DIY Moving Coil phonostage
- Thread starter sachu888
- Start date
sachu888
Well-Known Member
Hi Sajith,
no PCbs left for Moving coil PS,not even for me.I will order more boards later if there is enough interest.
I will receive few boards for CNC(with better finish)in this week,let me know if you need one.
Regards,
Sachin
cmsajith
Well-Known Member
no probs.
Please send me the CNC pcb and PM the total cost.
Please send me the CNC pcb and PM the total cost.
sachu888
Well-Known Member
CNC = MM only? If yes, I want want too if you can spare
No problem,I will keep one for you.Do you also need parts for this?
Regards,
Sachin
If you can source parts, I would very much love it if you can include me since you seem to know where to source very good parts (like the Vishay Dale resistors which you included in the HT MC PS). I will have to do a big journey of discovering of the right shops if I have to get such premium parts.
sachu888
Well-Known Member
I tried searching element14. It is so confusing. There are so many drop down menus one has to choose for a simple thing like a resistor. At least in my case, after making what I thought are the most intelligent choices, the final output was a nil each time. I realise that the filters are really useful and it allows you get to the desired part but there ought to be a simpler search function for dummies (me included).
sachu888
Well-Known Member
Yes that site is very complicated.I order components from 2-3 websites to get required parts.
Regards,
Sachin
HypnoToad
New Member
Hi there everyone, I am glad the HTMCPS is being liked in India.
With the values of R1/R9, it's to balance the inputs of the opamp, but the values are not that critical. So just use the nearest available value. I am not sure about that cart with a value of 2 ohms though, you will have to try it and see.
Also the values of first stage gain resistors R2/R10 are not that critical either, go to the next nearest value that the calculator gives if you can't get the exact value.
The second stage gain resistors are the 4 x 390ohms (2 of them are for gain and the other 2 to balance everything), if you find you have too much gain you can always "increase" the values of all four which will lower the gain and keep everything in balance.
I have used 470 ohms and 590 ohms in these positions. I would do this instead of decreasing the values of R2/R10 too much to lower the gain and would not go lower than the stock 390 ohm values.
If you want an increase in gain do that in the first stage by increasing R2/R10.
Hope this helps.
With the values of R1/R9, it's to balance the inputs of the opamp, but the values are not that critical. So just use the nearest available value. I am not sure about that cart with a value of 2 ohms though, you will have to try it and see.
Also the values of first stage gain resistors R2/R10 are not that critical either, go to the next nearest value that the calculator gives if you can't get the exact value.
The second stage gain resistors are the 4 x 390ohms (2 of them are for gain and the other 2 to balance everything), if you find you have too much gain you can always "increase" the values of all four which will lower the gain and keep everything in balance.
I have used 470 ohms and 590 ohms in these positions. I would do this instead of decreasing the values of R2/R10 too much to lower the gain and would not go lower than the stock 390 ohm values.
If you want an increase in gain do that in the first stage by increasing R2/R10.
Hope this helps.
Hi, I'm really glad to find you on HFV. Hope to learn a thing or two from a avid and knowledgeable DIYer.
Welcome Hynotoad!
good to have the original maker here
I am one of those benefitting from your phonostage. And that cart with 6 ohms (not 2) is mine, so was wondering what was the issue? Are there no resistors to match that or gain issues?Regards
sachu888
Well-Known Member
Welcome Hynotoad!
good to have the original maker here
Regards
HI Steve 6 ohm is not a problem,two 12 ohm resisters in parallel will make 6ohms.
Regards,
Sachin
HypnoToad
New Member
2 ohm is getting close to 0 or a short, I am not sure how low an input impedance the opamps can handle.
HypnoToad
New Member
.
I must put in a special thank you to Sachin for his hard work getting the PCB's made.
Without him we would not be able to share these projects. :cheers:
.
I must put in a special thank you to Sachin for his hard work getting the PCB's made.
Without him we would not be able to share these projects. :cheers:
.
sachu888
Well-Known Member
HypnoToad
New Member
If it works, its fine, like the saying, the proof of the pie is in the eating.
Order your Rega Turntables & Amplifiers from HiFiMART.com - India's reputed online dealer.
