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Old 14th June 2009, 08:50 PM   #1
HaLo6 is offline HaLo6  United States
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Default Soft Start Module

I am building a soft start module from avondale audio... however the board didnt come with part specifics and I dont knowenought about each part (well a few I do) to competenlypick them out. Could I get some help from the knowledge base here? ATtached is the board layout.
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Old 14th June 2009, 10:07 PM   #2
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I see.....

4x 10nF capacitors (ceramics?)
1x 220nF X rated fim capacitor
2x 470uF 35V electrolytic capacitor
1x 100uF 35V electrolytic capacitor
3x 10R 7W resistors
1x 220R 2W resistor
1x 800K-1M resistor (>1/4W?)
2x 24V zener diodes
2x 24V 10A relays
1x 1A 1000V bridge rectifier

I see there are some hand drawn notes that aren't fully visible pointing to the 220nF cap and the 10R resistors.

The board on Avondales website shows a MOV (metal oxide varistor) to the right of one of the 470uF caps and it has 6R8 resistors instead of 10R.

http://avondaleaudio.com/audiophile-...-start-module/
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Old 14th June 2009, 11:42 PM   #3
HaLo6 is offline HaLo6  United States
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yeah the hand notes are for the large 10R resistors that states for the US version to use 4.7 Ohm instead and the other note points to the 220nf X rated cap and states "Series capacitor 1uF" ...
I am confused on what part to get for the relays... digikey gives you so many options for them I dont know where to begin...

Anything special for the bridge rectifier? and what is a x-rated cap... I think its a UL rating for flame retardation correct?

I wish they would have supplied a BOM (I asked them for one and they really wouldnt supply me with one...)

thanks for your help! what you see is all the info I got for 10GPB a board...
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Old 15th June 2009, 01:44 AM   #4
HaLo6 is offline HaLo6  United States
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For the bridge rectifier I got digikey part number W10G-E4/51GI-ND
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Old 15th June 2009, 03:46 AM   #5
infinia is offline infinia  United States
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Quote:
Originally posted by HaLo6
...
I am confused on what part to get for the relays... digikey gives you so many options for them I dont know where to begin...
Yea the relay will be the key and the hardest part here. You really need to push to get a part number for that. or go hunting for a needle in the hay,
Otherwise you need to manually measure all the pin spacings and go part hunting... reviewing various data sheets of detailed mech drawings for a match. also from data sheet determine the electrical pin locations of the normally open contact match the PCB traces.

Fact1) coil voltage is 24Vdc
Fact2) the relays normally open contact is going to be across the series of power resistors. It closes that after power is applied.
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Old 15th June 2009, 11:45 AM   #6
amc184 is offline amc184  New Zealand
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Actually, the relays shouldn't be too hard, that style of relay is quite common. If you post a dimensioned diagram of the relay's pinout from the PCB, I can point out one that will work.
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Old 15th June 2009, 12:11 PM   #7
HaLo6 is offline HaLo6  United States
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I'll measure the board dimensions tonight! Here are pics of the board... (I have to find a ruler somewhere in the house)
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Old 15th June 2009, 12:25 PM   #8
HaLo6 is offline HaLo6  United States
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Second
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Old 15th June 2009, 12:37 PM   #9
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I think I might have a winner........

http://search.digikey.com/scripts/Dk...me=255-1108-ND
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Old 15th June 2009, 02:25 PM   #10
HaLo6 is offline HaLo6  United States
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Attached is the pitch of the holes for RLY 1&2
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