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Class D Switching Power Amplifiers and Power D/A conversion

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Old 20th July 2009, 08:28 PM   #411
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Finally finished my blaster. Here is the result:


Amplifier: Sure-electronics TK2050 2x100W
Power source: 2x 12v 9ah lead gelbattery
Drivers:2x P. Audio HP-10W
Piezo Tweeters: MPT-100 Piezo tweeter
Fuj:tech 12v--24V laptop charger


Click the image to open in full size.
Click the image to open in full size.

Nice bass and plays loud, im pleased with it! Only downside is huge weight: 25.8kgs.
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Old 20th July 2009, 08:34 PM   #412
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Tasty!

I guess you won't be checking that as luggage on your next flight.

All it needs is some name in chrome script right in the middle of the front. Seriously, nice job.

--Buckapound
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Old 21st July 2009, 12:56 AM   #413
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Very impressive work. Hope it sound even half as good as it looks.
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Old 21st July 2009, 08:32 AM   #414
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Quote:
Originally posted by Saturnus
Very impressive work. Hope it sound even half as good as it looks.
Sound is quite ok, except the high notes that the piezos play. I might someday change the piezo for a normal tweeter or a better piezo. Any suggestions?
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Old 21st July 2009, 09:53 AM   #415
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Quote:
Originally posted by whelibob

Sound is quite ok, except the high notes that the piezos play. I might someday change the piezo for a normal tweeter or a better piezo. Any suggestions?
Sure. The Zomax HP100 piezos I use sounds very nice, in fact it sounds so good that I changed back to it after trying several lower cost horn tweeter options.

I hope you remembered a serial resistor though otherwise piezo basically always sound like crap. A 47 to 66 Ohm 3W carbon or metal film type is a good starting point. Never use wirewound power resistors with piezos. You shouldn't expect miracles from one of the cheapest and crappiest piezos ever produced (yours).

With the Zomax HP100 the optimum resistor value is 150 Ohms
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Old 21st July 2009, 10:13 AM   #416
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Quote:
Originally posted by Saturnus


Sure. The Zomax HP100 piezos I use sounds very nice, in fact it sounds so good that I changed back to it after trying several lower cost horn tweeter options.

I hope you remembered a serial resistor though otherwise piezo basically always sound like crap. A 47 to 66 Ohm 3W carbon or metal film type is a good starting point. Never use wirewound power resistors with piezos. You shouldn't expect miracles from one of the cheapest and crappiest piezos ever produced (yours).

With the Zomax HP100 the optimum resistor value is 150 Ohms
Yes i did use 100ohm resistors with the piezos. Tried to google zomax piezos but only shop i found was in new zealand. You know any retailer in europe?
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Old 21st July 2009, 10:16 AM   #417
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Yup. In Denmark

http://www.dlt.dk/products/productin...tid=5003&ucp=1

They're about Euro 10.50 each. Don't know if they send abroad though. Try e-mailing them.
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Old 21st July 2009, 10:47 AM   #418
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Quote:
Originally posted by Saturnus
Yup. In Denmark

http://www.dlt.dk/products/productin...tid=5003&ucp=1

They're about Euro 10.50 each. Don't know if they send abroad though. Try e-mailing them.
Allright thanks. Which of those measures is for the whole i need to cut for it? I guess its "hulmål"?

• Belastning 50V - 94dB (1W/1mtr.)
• Piezomembran 23 mm (diameter)
• Frontmål: 93 x 86 mm (BxH)
• Hulmål 75 x 65 mm (BxH)
• Dybde 66 mm
• Vægt 0,1 kg
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Old 21st July 2009, 10:57 AM   #419
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Quote:
Originally posted by whelibob

Allright thanks. Which of those measures is for the whole i need to cut for it? I guess its "hulmål"?

• Hulmål 75 x 65 mm (BxH)
Yup.
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Old 21st July 2009, 04:50 PM   #420
Variac is offline Variac  United States
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Quote:
I hope you remembered a serial resistor though otherwise piezo basically always sound like crap. A 47 to 66 Ohm 3W carbon or metal film type is a good starting point. Never use wirewound power resistors with piezos. You shouldn't expect miracles from one of the cheapest and crappiest piezos ever produced (yours). With the Zomax HP100 the optimum resistor value is 150 Ohms
SO you are saying "I hope you remembered a serial resistor though. Otherwise piezo basically always sound like crap. " right?

I could add some punctuation to your post if that is the case..
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