I'm looking to make a TDA1541A with low budget and don't want to pay for expansive opamps.
What would you think is the best cheap transistor I/V stage for the TDA1541A?
Is there a cheaper alternative than transistors?
What would you think is the best cheap transistor I/V stage for the TDA1541A?
Is there a cheaper alternative than transistors?
Thanks.
There are a couple of symbols I'm not used to on this scheme.
Can I use the same 19v source for both 19v points?
Where it's marked 19V with a ground symbol under it, is it a 19V source?
Also, would there be a way to replace the 2SK170BL and all the parts around it by something else?
What's the circle with a triangle in the middle?
There are a couple of symbols I'm not used to on this scheme.
Can I use the same 19v source for both 19v points?
Where it's marked 19V with a ground symbol under it, is it a 19V source?
Also, would there be a way to replace the 2SK170BL and all the parts around it by something else?
What's the circle with a triangle in the middle?
I know thay my creations work with it........they were designed using it..............but don't ask what thread they are in. Or if I have any schematics, because I honestly do not. Maybe some of the gang has diagrams that they care to share.
Basically.............you put the current into a common base stage, that has CCS all around it.
Jocko
Basically.............you put the current into a common base stage, that has CCS all around it.
Jocko
DragonMaster said:
Yes, an resistor😉
You need +19V (top) and -19V (bottom) and ground between.
Yes, that is a +19V source.
2SK170BL, 1k resistor and 200 Ohm trimer represent 2mA (trimable) current source and can be replace with other trimable 2mA current source of your choice.
It's there just to show that TDA1541A is current output dac, it is not a component or anything.
Thanks,
Like what? Is it working at any voltage?
As long as I know, a resistor does not amplify current. 😉
Arrgh... I was planning to use a 19v-0-19v analog PSU like the TNT design, but I will have to get that voltage higher if I want to filter+ re-regulate it. Will I need to modify the value of the resistors around the TL431 regulators of the DAC part?
Like what? Is it working at any voltage?
Jocko Homo said:
Here is one. http://www.diyaudio.com/forums/showthread.php?s=&threadid=6121&highlight=
DragonMaster said:
I couldn't begin to answer that question as I don't use either but the simple and cheap enough to make building both a possibility.
You could also try the Pass D1 i/v stage. The general opinion on that stage is very positive.
BTW About the resistor i/v. That is what I use. While it does not amplify current, it does produce a voltage proportional to the current flowing through it.
Components? I'm gonna use mostly Xicon and Panasonic components. I need to make it low cost
I don't think it's cheap to build this tho. The only thing I found about it is that it needs high caps and it has a balanced output.
DragonMaster said:
Aside from the two output caps, and they do not have to too expensive , all the other parts should be fairly inexpensive
It does not have to be balanced and, as above, the output caps will be the most expensive items.
Orange Drops or OSCONs? 😉 (That's the most expansive caps I'm gonna buy before I start to work.)
DragonMaster said:
For output caps, I've never had been in a situation that needed anything larger than around 22uf and I haven't used Orange Drops outside PSU's, so I can't comment. Perhaps an advantage of Pedja Rogic's stage is that the 10uf output cap allows you to use a decent quality non-electrolytic without breaking the bank.
People in EICO tube amps Yahoo group say drops are the best economical choice.
Auricap is their best choice.
Auricap is their best choice.
How big is the biggest Orange drop? I didn't think the went much past 2u2 even in the lower voltage ranges.
Biggest drop? A pretty small value.
Tantalum?
I just found the scheme from the D1 service manual.
Is there any mod to bring to the I/V scheme or I can let the scheme as is and connect it to a 1541a instead of a PCM63?
Tantalum?
I just found the scheme from the D1 service manual.
Is there any mod to bring to the I/V scheme or I can let the scheme as is and connect it to a 1541a instead of a PCM63?
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