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Old 27th July 2011, 06:06 PM   #211
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Mouser and Digikey operate solely to the united states as far as I know and charge reasonable shipping whilst at it. They will ship worldwide mind you but charge an arm and a leg for it. This is quite frustrating because even with farnell/RS you still find loads of products (usually semi's) that those two just don't stock, yet Mou/Dig do. I have ordered a couple of times Mouser and once from Digikey, both give free shipping on orders over 50 but with taxes and import duty added on this comes out to over 75.

RS components are superb, free next day shipping on any order, I just wish their parts inventory was bigger.
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Old 28th July 2011, 09:22 AM   #212
AndrewT is offline AndrewT  Scotland
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I finally made my first Mouser order. The saving in component prices more than made up for the extortionate postage charges. Then I increased my quantities to ensure "free" postage to UK. But, I still had to pay UK VAT @ 20%.
In the past I have found Digikey and Mouser to be uneconomic to the UK.
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Old 28th July 2011, 09:57 AM   #213
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Ostripper, could this schematic of 6 pack PS work with 4 without problem?
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Old 28th July 2011, 12:06 PM   #214
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And one more Question can yours soft start be used in Pass amps?
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Old 28th July 2011, 03:49 PM   #215
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Quote:
Originally Posted by Josip_Del View Post
Ostripper, could this schematic of 6 pack PS work with 4 without problem?
"6pac" could work with 2,4,6. S4 (softstart) has been used with ANY power supply. adjust R1 (the external one- 68-220R - ) to get 20-22V after d1 with the relay active. With any 30-70v ac or dc source (trig) , start with 220R 3w , drop 150 , 100, 68R. Use value to get 12v across L1 (the relay).

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Old 28th July 2011, 04:54 PM   #216
AndrewT is offline AndrewT  Scotland
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I just vary the current limiting resistor to suit the transformer for soft starting.
I have gone as low as 40r and as high as 140r on my 240Vac mains supply. I have never used anything that measures as low as a single CL60. A series pair of CL60 may be ~30r and would suit a big transformer.
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Old 28th July 2011, 05:41 PM   #217
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Quote:
Originally Posted by AndrewT View Post
I just vary the current limiting resistor to suit the transformer for soft starting.
I have gone as low as 40r and as high as 140r on my 240Vac mains supply. I have never used anything that measures as low as a single CL60. A series pair of CL60 may be ~30r and would suit a big transformer.

I'm tapping the secondary (either the ac or dc) to trigger the soft start. The common collector mje340 darlington pulls the relay to ground.

Now, for the actual trafo load ... I think I have a single CL-50 (.75" X.25" + 8-9R cold).
http://www.thermometrics.com/assets/images/cl.pdf
These were removed from the 20 YO genesis , used for it's 1 KVA trafo's. Lasted 22+ years .. so far.
I would like to get these .... Digi-Key - 570-1058-ND (Manufacturer - SL32 10015)
BIG NTC - I think member MJL used these for his big HT amp.
You really need this for a large amp , a standard switch will quickly deteriorate
, even with a capacitor across it. My Altec- Lansing had no soft start , the front panel switch was a common replacement part. It's trafo is 800VA+.

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Old 29th July 2011, 09:09 AM   #218
repeet is offline repeet  Australia
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Read Research - Projects - Soft Start
this looks similar
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Old 29th July 2011, 03:31 PM   #219
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Default CRUDE.

Ain't got no semi's Not too safe either .... mine runs off the secondary , not 120-240vac !! . Do not build ! BAD

Mine has nice 2 sec turn-on delay , d2 discharges timing cap instantly at shutdown.
Same with this amp , most shortcomings in both OEM's and DIY have been addressed. Some also want VI limit and onboard protection. This is best left to a
good separate solid state DC/current protection setup. I WILL design/build one soon.
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Old 29th July 2011, 10:03 PM   #220
repeet is offline repeet  Australia
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OK thanks. I'm not using it, just stumbled across it recently. I actually use a Greg Ball SKA softstart kit.
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