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Old 31st May 2010, 12:59 PM   #3771
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Default Mu-metal shield & LSK380BL

@Rcruz

Arrived the mumetal shield 196mm x 315mm back self adhesive:

Click the image to open in full size.

I'm doubting for balanced use the 2SK170BL or the LSK389BL, I have both on hand only need the measure the Idss in the LSK389BL. If I will use 2SK170BL will be all new & I suppose that will better sharing the same pcb the regs & the phono & if I will use LSK389BL will be less work because half work done. 20pcs photo:

Click the image to open in full size.

Humm I'm enjoying only to mind in the work & the final success.
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Old 31st May 2010, 01:03 PM   #3772
massimo is offline massimo  Italy
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.... just because in a similar circuit optimized for k170 with IDSS 10.5 mA (very close then) you just modified R values.

Thank you!

P.S. Big strike today in Athens?
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Old 31st May 2010, 01:16 PM   #3773
Salas is offline Salas  Greece
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Each values assortment on specific posts looked best on the simulator as it was posted. So better not try mix.
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Old 31st May 2010, 04:47 PM   #3774
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Salas

Many thanks for your 11mA IDDS / 60dB gain simulation. It is very helpful, as I dont have the simulation software and all the needed knowledge behind it.

I will follow this path now, as I have all the needed parts.

Franz

P.S.
Any recommendations for a readily available shunt regulated pcb?
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Old 1st June 2010, 08:26 AM   #3775
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I started the layout of my pcb.

The complete stereo circuit:

Click the image to open in full size.

The pcb draft (every feedback and critic is welcome)

Click the image to open in full size.

And the raw material:

Click the image to open in full size.

Do the FET's require heathsinking?

Franz
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Old 1st June 2010, 11:12 AM   #3776
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No.

Felipe
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Old 1st June 2010, 12:45 PM   #3777
Salas is offline Salas  Greece
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Quote:
Originally Posted by Franz Gysi View Post
I started the layout of my pcb.

The complete stereo circuit:

Franz
R1, 101 must be 1.3K. Made by 3 pieces 3K9 1W in parallel in the 15mA IDSS first circuit you asked. Its a single 2K2 2W in the 11mA circuit. R12,C9a,b Would be more useful if not feeding the whole, but reserved for first stage so it cuts interaction, the other stages have already.
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Old 1st June 2010, 01:31 PM   #3778
juma is offline juma  Germany
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Quote:
Originally Posted by Franz Gysi View Post
... LM317 is limited to 37V...
No - the only 37V limit is the voltage difference between Vin and Vout.
So, as long as your Vin is not more than 37V higher than your Vout (and you respect the SOA) you can use LM317 at whatever absolute voltage value you wish (people often use it in tube circuits at 250V or 300V).
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Old 1st June 2010, 01:49 PM   #3779
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by juma View Post
No - the only 37V limit is the voltage difference between Vin and Vout.
So, as long as your Vin is not more than 37V higher than your Vout (and you respect the SOA) you can use LM317 at whatever absolute voltage value you wish (people often use it in tube circuits at 250V or 300V).
what about during start up? Particularly is there is a discharged capacitor on the output.
Is there any data for the 317 subjected to transient voltage overload?
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regards Andrew T.
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Old 1st June 2010, 02:00 PM   #3780
juma is offline juma  Germany
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It's always beneficial to carefully read the datasheet ...
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