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Old 22nd October 2012, 02:38 PM   #1851
Salas is offline Salas  Greece
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The CCS normally saved you with current limiting. Just try with 1K dummy to confirm.
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Old 22nd October 2012, 02:43 PM   #1852
roender is offline roender  Romania
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As Salas said, nothing was fried as short circuit protection is one of the many advantages for a shunt power supply. And it comes free with the design ;-)
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Old 22nd October 2012, 03:22 PM   #1853
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Hi Salas, Roender and Tea-Bag

just did my reset and everything works like advertised. Thanks again...
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Old 28th October 2012, 06:39 PM   #1854
pchw is offline pchw  United States
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Quick question to the jfets selection.

The build guide says 3-5mA range, and it also says
Quote:
A circa 4ma IDSS 9V testing JET gives you around 3mA.
My question is whether the 3-5mA range is the 9V testing reading,
or it is the prorated in-circuit IDSS?

For some reason, I have quite a few (50+% of a batch of 40pcs) at over 5mA IDSS using the 9V testing method. Can these be used by any means like at Q105?

Thanks!!
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Old 28th October 2012, 07:45 PM   #1855
AndrewT is offline AndrewT  Scotland
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Idss is the current passing when Vgs=0 and Tj=25degC

The in circuit current has Vgs not equal to zero, but some -ve voltage.
Inserting the resistor in the source, with gate to the ground side of that resistor creates that -ve Vgs and gives rise to Id<Idss.
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Old 28th October 2012, 09:46 PM   #1856
Salas is offline Salas  Greece
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Quote:
Originally Posted by pchw View Post
Quick question to the jfets selection.

The build guide says 3-5mA range, and it also says


My question is whether the 3-5mA range is the 9V testing reading,
or it is the prorated in-circuit IDSS?

For some reason, I have quite a few (50+% of a batch of 40pcs) at over 5mA IDSS using the 9V testing method. Can these be used by any means like at Q105?

Thanks!!
That's for IDSS on a battery out of circuit yes. Characterization for a parameter in other words. They can be used if you aren't planning a 40V+ reg. In an upper Vout range situation much current would make Q104 transistor hot (sinks Q105's feed, sees most of the voltage), Q102 hot by itself spanning the voltage distance to 4 LEDS potential. Still even in lower Vout range apps you should know that a strong Q103 will present higher voltage for same value voltage set trimmers and resistors. If it goes out of manageable revise resistance lower.
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Old 28th October 2012, 10:27 PM   #1857
pchw is offline pchw  United States
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Thanks, Salas and Andrew.
I am about to start a 5V SSLV1.1 point-to-point wire build for JP's ES9023P Dac by
using the parts that I already have. My transformer is 9-0-9 which should work out to approx. 12.5VDC at C105. I think I am not at risk of overheating any transistors without major human mistake :-)
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Old 29th October 2012, 11:10 PM   #1858
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Default SSLV1.1 has supply for tube heaters?

Dear all,
Has anyone tried to use BIB to supply undirected heated triode heaters? Say 6,3VDC (1A)
Thanks for your help.
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Old 1st November 2012, 03:12 AM   #1859
pchw is offline pchw  United States
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Quote:
Originally Posted by pchw View Post
Thanks, Salas and Andrew.
I am about to start a 5V SSLV1.1 point-to-point wire build for JP's ES9023P Dac by
using the parts that I already have. My transformer is 9-0-9 which should work out to approx. 12.5VDC at C105. I think I am not at risk of overheating any transistors without major human mistake :-)
It is up and stable upon first switch, no BOO
Next is to parallel a couple resistor to R101 and R103 to hit my 250mA and 5V mark then hook up to the dac ....
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Old 1st November 2012, 03:21 AM   #1860
Salas is offline Salas  Greece
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