Thanks for your answer.
Wow, very nice offer ! I'll think about it.
This makes me ask another question: what does limit the input voltage to 31V ? (STA508 datasheet says it can handle up to 36V; STA510A up to 39V !) Is there some component that is not dimensioned for such voltage ? Maybe the 5V regulator would need some heatsink ?
Wow, very nice offer ! I'll think about it.
This makes me ask another question: what does limit the input voltage to 31V ? (STA508 datasheet says it can handle up to 36V; STA510A up to 39V !) Is there some component that is not dimensioned for such voltage ? Maybe the 5V regulator would need some heatsink ?
Yes I want to use it to give a logical high from external source.
But on board I see some circuit, connected with R4.
can you explain what is connected to the mute pin on the board?
Sander
Hello, I need an advice. I'm building 88dB speakers rated at 160W 4Ohm and I need to power them, but I don't know what to choose. I found your webpage but I don't really know if I should go with T3 (didn't find any topic about it here if there is one please point me) or this amp. I would rather go with quality than quantity, but I think 100W is not enough. I know it's just 3dB but If I would want to add some tone controls it would need more power from the amp am I right? Is it even possible to add some tone controls to your amps? also, is it possible to limit the volume without sacrificing the quality? I don't want to accidentally feed 300W to my newly built speakers. Sorry for my noobish questions, but I don't know where else I should ask.
Ok, I checked the beginning of the thread, and it seams that the relays don't like higher voltage. So i'll have to adjust the step down resistor.
Furthermore, I'll have to adjust the feedback resistors to the TC2000 too. Do you see anything else ?
Does this offer apply to v2 also?
I was considering the same, but realized after putting a TK2050 2*50watt sure amp on my speakers that the 2*100watt from the hifimediy amp would be adequate. It is around 50 watts with low distortion.
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Does it get really hot with 30V already ? I'm only listening at moderate volumes.
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.
there is a power supply supervisor chip connect to mute pin, used for power on and off mute.
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.
When STA510A used, we can support about 24~38V for v1. And don't worry about over heat then.
actually I'd like to suggest my new pre-amp:
http://www.diyaudio.com/forums/digital-line-level/175167-vc23-my-new-pga2310-project.html
But need some days to come out.
http://www.diyaudio.com/forums/digital-line-level/175167-vc23-my-new-pga2310-project.html
But need some days to come out.
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)?
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?
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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