New TK2050 board - Page 3

sendler · 24th April 2010, 05:14 PM

Quote:

Originally Posted by Nick122147

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.

teamacc · 24th April 2010, 05:33 PM

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

sendler · 24th April 2010, 05:56 PM

Quote:

Originally Posted by teamacc

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.

a.wayne · 24th April 2010, 06:02 PM

Hello Scott,

Which class- d kit would you recommend as the best currently available ?...

Nick122147 · 24th April 2010, 06:03 PM

Quote:

Originally Posted by sendler

A tube pre might as well bypass the pot.

What would be the input impedance if I bypass the pot?

sendler · 24th April 2010, 07:25 PM

Quote:

Originally Posted by Nick122147

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.

sendler · 24th April 2010, 07:33 PM

Quote:

Originally Posted by a.wayne

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.

a.wayne · 24th April 2010, 08:09 PM

Quote:

Originally Posted by sendler

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 ?

sendler · 24th April 2010, 10:51 PM

Quote:

Originally Posted by a.wayne

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.

Nick122147 · 25th April 2010, 04:03 PM

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?

12V7AHµçÆ¿ 12V7AHÐîµç³Ø ÃâÎ¬»¤·§¿ØÊ½Ç¦ËáÐîµç³Ø-ÌÔ±¦Íø

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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24th April 2010, 05:33 PM	#22
teamacc diyAudio Member Join Date: Jan 2010	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

24th April 2010, 06:02 PM	#24
a.wayne diyAudio Member Join Date: May 2008 Location: Front Row Center	Hello Scott, Which class- d kit would you recommend as the best currently available ?...

25th April 2010, 04:03 PM	#30
Nick122147 diyAudio Member Join Date: May 2005 Location: Shanghai	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? 12V7AHµçÆ¿ 12V7AHÐîµç³Ø ÃâÎ¬»¤·§¿ØÊ½Ç¦ËáÐîµç³Ø-ÌÔ±¦Íø 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.