• These commercial threads are for private transactions. diyAudio.com provides these forums for the convenience of our members, but makes no warranty nor assumes any responsibility. We do not vet any members, use of this facility is at your own risk. Customers can post any issues in those threads as long as it is done in a civil manner. All diyAudio rules about conduct apply and will be enforced.

WTB: F4 PCB boards

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Jump to Latest
T

traw

Member
Joined 2005
thanks... just need to get nice 1 inch thick faceplate for now and some blue led(s)... hehe

i had picked up these heatsinks several months ago:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=300131127248&ssPageName=STRK:MEWA:IT&ih=020
had decent deal when i bought 10, was down to last 4 and figured use for F4 pair. so, now just gotta put another one together soon.

not sure on performance of the sinks, i just recall i built a hard biased aleph 3 (at 2.6 amps per channel) on same type chassis and ran very hot. figured F4 at 1.5 amp per channel and slightly lower volt rails would be ok. seems just about right, uh, lucky i suppose.

one thing was seemed almost moot matching the 9240's as values from a stick all measured about same, kind of like 9610's if i recall (P fet types).
 
Peter Daniel

Peter Daniel

Member
Joined 2002
audiosector.com
Paid Member
I have 75pcs of F4 amp boards shipped to me today, should receive them in 3 days. 75 more pieces will be shipped with F3 boards which are already in production.

The amp board has a scoring line and is good for two channels.

The PS board is good for symmetrical supply in stereo setup. If you want dual mono, you will need 2 PS boards.

All boards are gold plated. Prices include shipping and handling:

Amp board $10
PS board $15

Prices in USD, paypal payment to my e-mail address posted here: http://audiosector.com/contact.asp

Boards will be shipped by airmail, with no tracking and no insurance and I cannot assume responsibility for lost packages. If you need insurance, please add $7 to your order.
 

Attachments

  • f4.jpg
    f4.jpg
    96.7 KB · Views: 1,647
J

JimT

Member
Joined 2004
Try Rtools on the R Theta site

http://www.r-theta.com/rtools_front.html

I believe that the target is 50C for the chip. Nelson stated that the chip characteristics change with temperature and that the bias current is determined with this temperature in mind. I am trying to get the heat sink to be 50C at the chip location on the heat sink. I think that all the chips should be the same temperature. I'm a newbie, comments on my interpretation of this would be welcome.

Thanks
Jim
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Top Bottom