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Class D Switching Power Amplifiers and Power D/A conversion

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Old 24th April 2010, 06:14 PM   #21
sendler is offline sendler  United States
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Default Try it

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Originally Posted by Nick122147 View Post
Thanks sendler! So you're saying that the present solution is prefarable to adding an (higher quality) stepped pot which is wired on?
I haven't listened to pots in along time. It's hard to say. It would be easy for you to try a stepped attenuator to find out. I'm not crazy about the current crop of series attenuators for technical reasons though. I haven't tried one but it seems that you are adding a lot of solder joints to the signal path. You colud actually just measure your pot at a reference listening level and then duplicate the attenuation with different values of resistors in it's place on another amp in order to compare at that fixed level.
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Old 24th April 2010, 06:33 PM   #22
teamacc is offline teamacc  Netherlands
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How about these?
* 2 pcs * of DACT Type 21 Stepped Attenuator 100K 2A3 - eBay, Integrated Amplifiers, Amplifiers, Home Audio, Electronics. (Eindtijd 18-mei-10 16:28:03 CEST)
No solder joints, 1% SMD resistors.
Only thing it might be carbon resistors though... :S
Got two of those here
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Old 24th April 2010, 06:56 PM   #23
sendler is offline sendler  United States
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Default Series attenuators

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Originally Posted by teamacc View Post
How about these?
* 2 pcs * of DACT Type 21 Stepped Attenuator 100K 2A3 - eBay, Integrated Amplifiers, Amplifiers, Home Audio, Electronics. (Eindtijd 18-mei-10 16:28:03 CEST)
No solder joints, 1% SMD resistors.
Only thing it might be carbon resistors though... :S
Got two of those here
Those are the series style that have become common. The signal passes through every resistor, one at a time, on it's way through. 100k is very high but you never know what something will sound like until you listen. Sound often does not follow theory. There are many trade offs.
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Old 24th April 2010, 07:02 PM   #24
a.wayne is offline a.wayne  United States
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Hello Scott,

Which class- d kit would you recommend as the best currently available ?...
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Old 24th April 2010, 07:03 PM   #25
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Quote:
Originally Posted by sendler View Post
A tube pre might as well bypass the pot.
What would be the input impedance if I bypass the pot?
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Old 24th April 2010, 08:25 PM   #26
sendler is offline sendler  United States
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What would be the input impedance if I bypass the pot?
It would tend to be set by the gain setting divider in front of the TC2000 which forms a virtual ground in the center tap depending on what values you chose for the series resistor so probably 22k but this is virtual ground so I am not sure that it actually might measure higher. My dac chip seems to prefer an additional terminating resistor of 22k to ground on the input. You can go crazy tweaking a circuit. Everything sounds different including many things that engineer types will tell you that you can not hear. At some point you have to stop and just listen to music.
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Old 24th April 2010, 08:33 PM   #27
sendler is offline sendler  United States
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Hello Scott,

Which class- d kit would you recommend as the best currently available ?...
I have only tried one class D amp and it turned out to kill the sonics of my AB amps. A TK2050 seems hard to beat for the price. I would stick with that over a 2020,2022,2024. The truepath 3020 also gets great reviews but costs more. I need 8 channels at least, maybe more if I use DVC woofers so price is somewhat under consideration.
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Old 24th April 2010, 09:09 PM   #28
a.wayne is offline a.wayne  United States
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Originally Posted by sendler View Post
I have only tried one class D amp and it turned out to kill the sonics of my AB amps. A TK2050 seems hard to beat for the price. I would stick with that over a 2020,2022,2024. The truepath 3020 also gets great reviews but costs more. I need 8 channels at least, maybe more if I use DVC woofers so price is somewhat under consideration.
Are you specifically recommending the TK 2050 kit listed here ?
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Old 24th April 2010, 11:51 PM   #29
sendler is offline sendler  United States
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Are you specifically recommending the TK 2050 kit listed here ?
His amp looks quite nice with volume and speaker protection already on the board but I don't think he has any more right now. Also, I have found that the output coil is crucial and I would mod it with the Wurth WE-PD XXL coils no higher than 6uH.
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Old 25th April 2010, 05:03 PM   #30
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I'm thinking of trying battery power. Would two batteries like this be ok? Can I charge them also in series with a 24V charger?

12V7AHƿ 12V7AH άʽǦ-Ա

translated specs:

Battery 12V7.0Ah/20hr
Rated Voltage: 12V
Rated Capacity (20hr): 7Ah
Dimensions: Length: 151mm Width: 66mm high: 96mm Total height: 102mm
Reference Weight: about 2.8Kg
Actual capacity of different discharge rate
20 hours rate: 7Ah
10-hour rate: 6.5Ah
5 hour rate: 5.9Ah
1 hour rate: 4.2Ah
15-minute rate: 2.9Ah
The relationship between volume and temperature (20 hour rate)
40 ℃ (104 ℉): 103%
25 ℃ (77 ℉): 100%
0 ℃ (32 ℉): 86%
-15 ℃ (5 ℉): 65%
At 25 ℃ (77 ℉) resistance when fully charged: about 22mΩ
Charging method (constant voltage)
Cycle: the maximum charge current of 1.75A
Charging voltage 14.5-15.0V/12V77 ℉ (25 ℃)
Charge temperature compensation voltage-24mV / ℃
Float: Maximum charging current 1.75A
Charging voltage 13.6-13.8V/12V77 ℉ (25 ℃)
Charge temperature compensation voltage-18mV / ℃
Apply to electronic scales, emergency lights, children's toy cars, lawn, parking locks, power systems, access control systems, uninterruptible power supplies, etc.
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