OLD THREAD Hi-end phono preamplifier by Andrea Ciuffoli
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quanghao
diyAudio Member

Join Date: Sep 2009
Location: Vietnam
Quote:
 Originally Posted by tangmonster R1 = 22r = 16V drop R1 = 1k = 67V drop R1 = 500R 20W= 35V drop = 65C irf840 = 50C irf9610 = 60C I suppose i am going to Is 60C ok for irf9610? or is it too high?
60 C , it is ok for 9610, 840
how many voltage drop Irf 9610??
And you AC = ???

Last edited by quanghao; 4th August 2010 at 04:02 PM.

 4th August 2010, 03:59 PM #282 tangmonster   diyAudio Member     Join Date: Jul 2007 Location: Cape Town yes , but my transformer is sitting at 57C due to all the wasted heat. lm317 sitting at 75C I am going to have to lower primary voltage or get different transformer sigh 230V ac and 9v AC is WAY to high for this circuit.....
quanghao
diyAudio Member

Join Date: Sep 2009
Location: Vietnam
Quote:
 Originally Posted by tangmonster yes , but my transformer is sitting at 57C due to all the wasted heat. lm317 sitting at 75C I am going to have to lower primary voltage or get different transformer sigh 230V ac and 9v AC is WAY to high for this circuit.....
yes! 230vAC~290VDC, so R1= 50V, and 9610 = 40V drop, i calculate max for it!
and now i use that! You can down VAC min = 200V, so down R1, it is low

tangmonster
diyAudio Member

Join Date: Jul 2007
Location: Cape Town
Quote:
 Originally Posted by quanghao yes, it is ok. 230 x 1.28 = 294v, +b need 200 v , i= 40ma, ok,
you said it was ok!!!!!!!!!!

Don"t look for excuses now!!!???

tangmonster
diyAudio Member

Join Date: Jul 2007
Location: Cape Town
ALL YOUR DRAWINGS SHOW 220 to 250V AC???????

Heater circuit 7 to 9V AC???
Attached Images
 Cricuit-SSHV-for-PhonoASH.jpg (210.6 KB, 417 views)

 4th August 2010, 04:40 PM #286 guglielmope   diyAudio Member   Join Date: Nov 2004 Location: Udine Hello Andrea, I'm building the circuit, but I'm thinking about the change of the anode resistors (//22K) with a ccs like cascode DN2540. What do you think about? The Riaa circuit needs any adjustement? Thanks a lot for you help. Ciao Guglielmo
 4th August 2010, 10:10 PM #287 pred   diyAudio Member   Join Date: Aug 2004 Location: Neuchatel In my days it was 230VAC is 320VDC (factor of 1.41) but maybe this changed over time I think it is too high For heater you need min 7V since it is 9.87VDC-1.5V drop for diodes so you get 8.3. So then you will have minimum required drop for LM317 that is 2V. Pred Last edited by pred; 4th August 2010 at 10:14 PM.
 5th August 2010, 02:41 AM #288 quanghao   diyAudio Member   Join Date: Sep 2009 Location: Vietnam Hi tangmonster, and all! Well I have calculated wrong for you, I apologize, thank you just for me! Hope you always help me find my mistakes, to my product for you to be more perfect. __________________ ES9038PRO: http://quanghao.com/ http://www.audiodesignguide.com/DACES9038PRO/index.html
quanghao
diyAudio Member

Join Date: Sep 2009
Location: Vietnam
Use center transformer for SSHV

Use center transformer for SSHV
if you have transformer: 200-0-200 V you can use PCB
you se in the image
Attached Images
 USE-CENTRE.jpg (405.9 KB, 411 views)

 5th August 2010, 07:22 AM #290 tangmonster   diyAudio Member     Join Date: Jul 2007 Location: Cape Town 200V Ac will give 282V dc That is still a 82V drop. I think you can safely drop the 200Vac to 180Vac(254Vdc) With 9Vac my lm317 is sitting at 75C which is too high. Using a 6.7c/w heatsink. Long story short I will need to get a different transformer...... 170Vac and 7Vac should do nicely For now I am going to experiment with a 10ohm 50W resistor on the primary of the transformer to drop input and output voltages 170Vac and 7Vac should do nicely

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