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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp - Page 9

post #121 of 269
Quote:
Originally Posted by TestSubject View Post

This is how R3/R9 should be right?

 

3.6.2:

Screen shot 2011-08-14 at 4.45.53 PM.png


 

Yes. R3 and R9 go the the gates on the IRF510 (pin 1 or the left most pin if the part is facing you with the legs down) 

 

 

You are missing R2 and R8 for the mosfet bias. Apologies if you are not finished yet.

 


Edited by digger945 - 8/14/11 at 8:04am
post #122 of 269
Quote:
Originally Posted by TestSubject View Post

This is how R3/R9 should be right?

 

3.6.2:

Screen shot 2011-08-14 at 4.45.53 PM.png



yes

 

edit: oops didnt see digger already posted 


Edited by kchapdaily - 8/14/11 at 8:17am
post #123 of 269
Thread Starter 

I have labeled R2/R8 is this okay?

587283e1_Screenshot2011-08-14at4.45.53PM.png

post #124 of 269
Quote:
Originally Posted by TestSubject View Post

I have labeled R2/R8 is this okay?

587283e1_Screenshot2011-08-14at4.45.53PM.png

Yes. 
 

 

 

post #125 of 269

Yep, what he said.

 

Pierre, I dont know if you wanted to keep the bypass caps, but should add to the list if possible.
 

Quote:
Originally Posted by digger945 View Post



Is this your final shopping cart?

 

Are the resistor amounts still 100 pcs, or the Qte to the left of the page? ... if so then you will need to change...

2 pcs of the 1k resistor

2 pcs of the 220k resistor

2 pcs of the 390k resistor

2 pcs of the 33k resistor

 

 ... and add...

2 pcs of the 220uF 16v. These can be Nichicon Muse ES, or Sanyo OSCON. If those are not available then we can take a look at something else.

 



 

post #126 of 269
Thread Starter 

i did try to reply earlier but i guess it didnt work. I am having trouble ordering what i want, i am calling an electronic store tomorrow and speak my way out of this. i dont understand why French store wont work but so far nothing has worked out the way i wanted. Seems like they have very small inventories. Bigger stores are USA/UK based and charge to much for shipping.

 

I will keep you posted but thanks again

 

EDIT: Today everything was closed will try tomorrow


Edited by TestSubject - 8/15/11 at 4:38pm
post #127 of 269
Thread Starter 

Here is a quick update, i have been trying to order the part online here in France and is has been a real nightmare (no it's not laziness), Digger945 has kindly agreed to send me the parts from mouser.com as mouser.fr asked 30$ for shipping.

 

I need a soldering iron, I might as well invest into a good one, i found this  Weller wtcp-s second hand but looking almost new for 120$ what do you think?

Can probably go a bit lower if i bargain here is the LINK

 

Thanks everyone for showing so much support and i hope that the next post will be pic of my build in progress.

post #128 of 269

a good soldering station is very important. i have an aoyue 937+ and i highly recommend it. its a good quality hakko clone and it performs very well. not sure how much it would cost in france, but i got it for 60$ shipped in the us. heres the link

http://www.amazon.com/Aoyue-937-Digital-Soldering-Station/dp/B000I30QBW/ref=sr_1_1?ie=UTF8&qid=1313982476&sr=8-1

 

i dont have any experience with weller stations but they seem to have great reviews.

post #129 of 269
Thread Starter 

What i have so far:

Sofar.JPG

1: Large Wooden Cigar Box

1: Cisco PSU with the wrong plug for my country (not a problem but funny since it comes from china).

2: Ceramic tube socket.

2: Mosfet

1: "Super" computer heat sink with possible fan.

1: Bad picture

 

Will the computer heatsink be enough? Will it work if i just drill a hole and bolt the Mosfets to it with termal paste? Wooden box so no Ground problem.

 

EDIT: Here is a better picture of the sockets i got from eBay:

photo (1).JPG


Edited by TestSubject - 8/22/11 at 6:42pm
post #130 of 269

heatsink should work it looks large enough. nice choice for the enclosure! i like it

post #131 of 269


 

Quote:
Originally Posted by TestSubject View Post

Will the computer heatsink be enough? Will it work if i just drill a hole and bolt the Mosfets to it with termal paste?


What is the dissipation rating for the heatsink? Size and shape alone are not an indication of performance.

 

Are you still going forward with a single tube implementation?

 

post #132 of 269
Thread Starter 

I am sorry, i do not know the dissipation rating, i got it from a computer i found in a dump while looking for parts in my quest into making a jet engine.

 

It is a CPU heat sink, it should, in theory be fairly good quality,(came with a fan if needed) but that is not very scientific i agree.

 

I would like to try the one tube version, should help not having to "match" tubes plus it is overall less expensive.

 

However, i am afraid i dont have the competence to modify the design that will match the single tube modification.

post #133 of 269
Now I am more curious about the jet engine! biggrin.gif

Must be one heck of story behind that DIY!!
post #134 of 269
Thread Starter 

Ever dreamed of driving a batmobile?


Edited by TestSubject - 8/22/11 at 8:12pm
post #135 of 269

buying individual heatsinks for each mosfet would possibly be more effective, if digger is sending you the parts why dont you add those to the list? there very cheap only about 1$ each. that way you dont have to guess whether or not your heatsink will dissipate enough energy

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