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Class D Switching Power Amplifiers and Power D/A conversion

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Old 27th October 2010, 04:12 PM   #951
ericg is offline ericg  France
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Hi Steinar, can you please tell me if the switch on V1 board is switching directly power or is it switching the power relay?
I want to relocate it on the front of my case but I need to know which kind of switch I have to order (current rating mainly).

Thanks in advance,

Eric
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Old 27th October 2010, 04:13 PM   #952
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Quote:
Originally Posted by Havoc08 View Post
Does this offer apply to v2 also?
No. v2 is 100W+100W so it's already big enough with the heatsink we use.
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Old 27th October 2010, 04:17 PM   #953
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Originally Posted by benoar View Post
Does it get really hot with 30V already ? I'm only listening at moderate volumes.
When STA510A used, we can support about 24~38V for v1. And don't worry about over heat then.
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Old 27th October 2010, 04:19 PM   #954
pipsk is offline pipsk  Slovakia
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Originally Posted by hifimediy View Post
Hi, T3 is the only choice I think. And you can add pre-amp before this amp to control tone or volume. Or if you add a potmeter, it will be another simple way to control volume and good quality. Nick sell some potmeter with small PCB.
Can you suggest a preamp for T3?
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Old 27th October 2010, 04:30 PM   #955
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actually I'd like to suggest my new pre-amp:
VC23, my new PGA2310 project
But need some days to come out.
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Old 27th October 2010, 05:04 PM   #956
Havoc08 is offline Havoc08  Denmark
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Quote:
Originally Posted by benoar View Post
Hi hifimediy,

Second, did you consider making an amp with STA510A as power amplifier ? This chip is the only one from the STA5xx series to have a 150mOhm typical RdsON (vs 200mOhm for the others; hence the A suffix ?). It would quite enhance the damping factor, I think.

Thanks.
Hifimediy it is not a question of more wattage, but it would be nice to have a better damping factor. This is not possible with v2 amp (to use the STA510A)?
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Old 27th October 2010, 05:06 PM   #957
Havoc08 is offline Havoc08  Denmark
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Quote:
Originally Posted by hifimediy View Post
No. v2 is 100W+100W so it's already big enough with the heatsink we use.
Should have quoted this also for context.

Is the heatsink removable or glued on? I don't mind swapping it for a better one if I can get the STA510A then?
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Old 27th October 2010, 07:41 PM   #958
ericg is offline ericg  France
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Quote:
Originally Posted by ericg View Post
Hi Steinar, can you please tell me if the switch on V1 board is switching directly power or is it switching the power relay?
I want to relocate it on the front of my case but I need to know which kind of switch I have to order (current rating mainly).

Thanks in advance,

Eric
Maybe my request can be answered as well by Hifimediy!

Thanks in advance,

Eric
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Old 28th October 2010, 01:01 AM   #959
zeeuw is offline zeeuw  Netherlands
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Hello

are the Hifimediy amps also suited for driving 16 ohm speakers?
If so which board is best?

Sander
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Old 28th October 2010, 05:25 AM   #960
benoar is offline benoar  France
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Quote:
Originally Posted by hifimediy View Post
yes, you have to know very well before DIY on board. For STA510A, we will change the value of resistor for relay to meet higher voltage use. And I think the heatsink is ok for that, because we use same one on v2, which is similar power as v1 with STA510.
OK, thanks for these informations. Nice to knom the relays resistor will be changed. But will you adapt the feedback resistors too, as I wondered earlier ? If I go for 36V Vcc, with 1kOhm Rfbb we must have 17kOhm Rfbc. Or maybe another combination since 17kOhm may not be easily available. This will also increase a bit the gain; should I also compensate for it by decreasing Rf ?

About the gain, I was always puzzled looking at the 1.5V input sensitivity of TC2000. But now, I may have found why: the datasheet says the output of TC2000 should be driven up to 4Vpp. With a unity gain on the input stage, which is biased at 2.5V this leaves a 1.5V headroom, our input sensitivity ! Am I wrong on that ?

This make me think : with common 2V line input voltage, shouldn't we decrease a bit the input gain ? Like making Rf 15kOhm ?

Maybe you already thought about that, I am just trying to understand better your schematics…
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