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Old 17th November 2012, 09:48 AM   #11
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when I look up relays for the board at digikey, I get 1780 different choices. Can you give an appropriate manufacturers number suggested that fits the board. thanks, John
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Old 17th November 2012, 11:04 AM   #12
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Quote:
Originally Posted by JohnGeneva View Post
when I look up relays for the board at digikey, I get 1780 different choices. Can you give an appropriate manufacturers number suggested that fits the board. thanks, John
It is a standard 5-PIN SPDT G5L relay, you shouldn't have any problem looking for that in digikey.

Here's an example...

G5LA-14 DC12 Omron Electronics Inc-EMC Div | Z2561-ND | DigiKey
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Old 23rd November 2012, 02:11 PM   #13
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Looking at mouser's website I noticed that the 2sc*** transistors are obsolete.
Looks like 2N5232 will do the same job.
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Old 25th November 2012, 09:07 PM   #14
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Does this item deal with turn off thump?

The ACA has a big old thump at turn off and I cant figure out what it is
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Old 25th November 2012, 10:41 PM   #15
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In my experience with using it, the turn-off depends with the supply connected to the Speaker Protector.

So if you are to use the same power supply used to power the ACA then during turn-off the power is drained faster so the speaker cutoff can be faster. Though I do not know if this is fast enough for the ACA turn off thump.
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Old 28th November 2012, 04:29 AM   #16
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Hi there - Any reason I can't use a bc550 or equivalent for the 2sc945?
and the cs9013? Can I swap in a bd139?

Cheers!
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Old 28th November 2012, 05:10 AM   #17
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I haven't tried that actually, but I bet it will work with the BC550 without any problems. You will however need to twist the transistor leads as the the C945 are E-C-B while the BC550 are E-B-C.

As for the 9013 I think it's ok too, just watch out for the transistor lead orientation.

Cheers!
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Old 28th November 2012, 08:14 AM   #18
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gotcha - I'll have a couple of 'dancing' transistors... I'll get back to let you know how it went.
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Old 28th November 2012, 08:21 AM   #19
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well, I used to do that at my former work because I think the designer of the board and the company's purchaser were both drunk. the designer designed the board for the wrong transistors while the purchaser ordered the wrong transistor.

please do let us in on the results so we can have this included in our FAQ to help other builders.
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Old 7th December 2012, 09:34 AM   #20
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I just tested the circuit, relays are working good, I tested it according to the instructions.
One thing, though, the LED that is supposed to blink and then go ON, is constantly ON. Any thoughts why would that be?
Transistors I'm using are 2N5232 and MPSA06. All other parts are according to the BOM.
Ah yes the LED I'm talking about is PURPLE!!!
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