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Old 12th February 2009, 11:02 PM   #131
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Use a couple of thermistors like Cl60 or whatever matches your particular amp needs. Install a time delay on relay to switch out the thermistors and bring in the line load. A decent timed delay on relay on Ebay is not too terrible expensive and the thermistors are dirt cheap.
ESP audio the Rod Elliot site has a good soft start circuit. Just google and you should not have any problem finding it.

Tad
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Old 13th February 2009, 02:25 AM   #132
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Quote:
Originally posted by rhysh



1 x DRV134
2 x 0.1uf capacitors
3 x molex kk .156
1 x 3 way terminal block

Can you please poing me to some website where can i see an pic of the "3 way terminal block"?

and i see your website and TI Datasheet where i see that say 1uf instead 0.1uf, this will be the same?

Regards
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Old 13th February 2009, 03:06 AM   #133
HaLo6 is offline HaLo6  United States
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So if I use a ~500Va trafo I shouldn't need a soft start circuit correct? i am new at this and am trying to keep this as simple as possible
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Old 13th February 2009, 07:02 AM   #134
rhysh is offline rhysh  United Kingdom
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Quote:
Originally posted by samsagaz



Can you please poing me to some website where can i see an pic of the "3 way terminal block"?

and i see your website and TI Datasheet where i see that say 1uf instead 0.1uf, this will be the same?

Regards

Sorry, i was thinking the wrong thing here. 1uf is correct.

I have to hurry off somewhere now, i will post the terminal block when i get back.
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Old 13th February 2009, 07:03 AM   #135
rhysh is offline rhysh  United Kingdom
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Quote:
Originally posted by HaLo6
So if I use a ~500Va trafo I shouldn't need a soft start circuit correct? i am new at this and am trying to keep this as simple as possible

Maybe. I would still use some form of soft start with 500va. A lot of people dont keep in mind.
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Old 13th February 2009, 08:09 AM   #136
AndrewT is offline AndrewT  Scotland
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The mains fuse needed for a transformer or motor is about
transformer power Times three Divided by mains voltage.
Fuse rating = VA * 3 / Vac.
This applies to any size of transformer.

If you are happy using a fuse three times as big as you need then go ahead.
I recommend close rated fusing that allows the amplifier (or any equipment) to run with in it's design specification and does not suffer from nuisance fuse blowing.
This fuse rating <= VA / Vac.

eg.
100VA transformer running on 110Vac.
Without soft start it requires a T3A fuse. Close rated fuse could be between T600mA and T1A
Now try that for 300VA and 500VA and 1kVA.
I know which I prefer.
__________________
regards Andrew T.
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Old 13th February 2009, 09:08 AM   #137
TS Lo is offline TS Lo  Hong Kong
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Default Soft start

Hi,

I bought a kit from China for 70.00 Yen(RMB).
1.00 USD = 6.8 Yen

Cheers
TS
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File Type: jpg soft start.jpg (89.6 KB, 402 views)
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Old 13th February 2009, 09:10 AM   #138
TS Lo is offline TS Lo  Hong Kong
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Default Soft start

Hi,

Schematic diagram.

Cheers
TS
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File Type: gif schematic.gif (21.8 KB, 401 views)
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Old 13th February 2009, 05:16 PM   #139
rhysh is offline rhysh  United Kingdom
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6 more people to pay. Nothing is moving until everyone has paid up.
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Old 13th February 2009, 07:33 PM   #140
beaver is offline beaver  Sweden
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Payment sent!
Looking forward to build this ampifier.

Thanks rhysh for organizing this groupbuy
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