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Class D Switching Power Amplifiers and Power D/A conversion

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Old 25th April 2013, 06:05 PM   #3771
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Quote:
Originally Posted by brummiejon View Post
Hmmm...... I've just taken delivery of the 4ohm power resistors for my boominator filter (I'm using HP10w's and PT-407N's).... It's bigger, heavier and not what I expected, is this the right type?

BJ
Nope. That's a common wire-wound resistor. Certainly not carbon composition as recommended.
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Old 25th April 2013, 06:34 PM   #3772
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I thought it didn't seem right.... Not sure where to find them..... Europe Audio?
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Old 25th April 2013, 06:50 PM   #3773
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On the Europe audio site they list, metal oxide, foil and superes.... It's not helping me, none of these suggest carbon..... I'm totally new to this particular game
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Old 25th April 2013, 06:58 PM   #3774
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I'd take a look at eBay - they usually have everyting you need
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Old 25th April 2013, 07:04 PM   #3775
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Hmm, none on eBay at 4ohms
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Old 25th April 2013, 07:11 PM   #3776
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Ah. Now I get it. You mean the resistor needed to dampen a PHT-407N. Yeah. That's the right one they sent you.

I thought we were talking the 47ohm resistor on a piezo tweeter. That has to be carbon composition, or alternatively metal film.

Wirewound is fine for the series resistor before the series cap on a PHT-407N
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Old 25th April 2013, 07:36 PM   #3777
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Originally Posted by Saturnus View Post
Ah. Now I get it. You mean the resistor needed to dampen a PHT-407N. Yeah. That's the right one they sent you.

I thought we were talking the 47ohm resistor on a piezo tweeter. That has to be carbon composition, or alternatively metal film.

Wirewound is fine for the series resistor before the series cap on a PHT-407N
Phew, thanks Saturnus....... They are bigger and heavier than expected but as long as they are right, I can proceed... You suggested that I try 1 (or 2 paralleled) in series to my audio taste, so I bought 4..... I'm assuming that this sets the level of the tweeter and the cap sets the crossover point. I'm going to wire these in a way so I can easily remove them if I decide to upgrade to 24v amp9 and minidsp.........

or maybe I'll just build a signature an be done with it

BJ
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Old 27th April 2013, 11:17 AM   #3778
aabo is offline aabo  Denmark
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I finally started building a Boominator and originally I bought and planned to use a 2011 Lepai ta2020 but because people are having bad experiences with this amp I wanna get a better amp.

I found the new Indeed TA2021 and ordered it, but then realized than the input sensitivity is 600mV, which as far as I understand isn't good. It should be around 200mV.

So now my eyes are on either the SMSL SA-S1 TA2020 SMSL Silver SA S1 TA2020 20W 2 Pro Audio Class T Tripath Digital Amplifier Hi Fi | eBay or the SMSL SA-S3 TA2021 SMSL Hi Class SA S3 TA2021B Hi Fi Digital Amplifier Silver | eBay

I can't figure out which would be the best investment in terms of performance and power usage.

I'm using 3 12v 9AH and HP-10W and monacor 001 piezo's.

Any input is higly apreciated and thanks to Saturnus and others for all the information in this thread!
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Old 27th April 2013, 02:46 PM   #3779
aabo is offline aabo  Denmark
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Upon further inspection of the SMSL SA-S1 TA2020 SMSL Silver SA S1 TA2020 20W 2 Pro Audio Class T Tripath Digital Amplifier Hi Fi | eBay I can't find out what the input sensitivity on this is. I have searched Google and everywhere but without any luck.

I'm assuming that its 200mV but I want to be sure before I might place an order.

Can anybody enlighten me here?
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Old 28th April 2013, 02:06 PM   #3780
floxer is offline floxer  France
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Quote:
Originally Posted by Noobinicer View Post
After having read all the pages, and posts of this thread, I cant seem to remember anyone asking if they could use the HP10IT. I googled HP10w, but the link i pressed took me to the HP10IT, it's the same price, and the picture looks exactly the same... Can I use the HP10IT for this project, it seems like the exact same speaker...
Quote:
Originally Posted by Saturnus View Post
No
I have the same problem to find HP10W and the intertechnik's seller say me :
"I still explained a lot of times that the HP10W and HP10IT are 100% identical ."

Saturnus can you explain why i can't use HP10IT for boominator ?

Txs
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