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Old 4th June 2007, 07:40 AM   #41
cviller is offline cviller  Denmark
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Quote:
Originally posted by Manu
Hi cviller,
Did you build the D1?
I only built the I/V stage and connected it to a pcm1798. I haven't had time to redo it with a better dac, but that is on my list and I plan to try to use jfets instead of irf610.
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Old 4th June 2007, 08:01 AM   #42
t. is offline t.  United Kingdom
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Could somone please send me the manual too at
multibit (at) ntlworld (dot) com

Thank you
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Old 15th June 2007, 11:24 AM   #43
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Does anybody know the actual transconductance of an irf610 at 10mA ?
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Old 15th June 2007, 07:12 PM   #44
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Quote:
Originally posted by Tazzz
Does anybody know the actual transconductance of an irf610 at 10mA ?
About .1S or so. This is the equivalent of about 10 ohms.

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Old 15th June 2007, 08:52 PM   #45
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Quote:
Originally posted by Nelson Pass


About .1S or so. This is the equivalent of about 10 ohms.



Thanks!


What would you think of scaling the positive rail and the I/V resistor for some 15-20volts and drive a F4 directly ?

Possible slewrate problems ?
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Old 24th June 2007, 04:50 PM   #46
xaudiox is offline xaudiox  Philippines
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Default IRF610 Alternative?

Hi Guys,

I'm currently building a DAC and would like to try the D1.. but it seems i cant find the IRF610 locally unless i order them online.. Im hoping i can use alternatives.. Which to do you will be best the substitute:

IRF530
IRF640
IRF740
IRF830
IRF840

thanks
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Old 24th June 2007, 06:58 PM   #47
MaxS is offline MaxS  France
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Try to obtain som FETs from Fairchild Semi :
http://www.fairchildsemi.com/pf/FQ/FQP34N20.html
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Old 24th June 2007, 10:08 PM   #48
xaudiox is offline xaudiox  Philippines
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Thanks for the replay Max..

but unfortunately fairchild doesnt ship to the philippines..

among the fets above which do you think, is my best choice for the D1?

im thinking irf830...
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Old 24th June 2007, 11:03 PM   #49
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I am curious of the manual as well - Thanks.

mpmarino

at

gmail

dot

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Old 24th June 2007, 11:13 PM   #50
Zen Mod is offline Zen Mod  Serbia
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let say that is here for next few weeks .

if Papa say that's not OK with him,I'll delete it sooner
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