I wouldn't play with that. I experienced an explosion of four lateral mosfet just because of similar things, it was not pleasant. It's one thing when you're working for yourself or testing, but when it goes public, it must be safe. I wouldn't like to be in your shoes if someone's tweeters or amplifier burn out due to the lack of two resistors in the circuit 😉 .@grunf I am testing this TPA I/V for 8 years, from 2016, in different configurations 😊
each is responsible to use the diy circuitries here at his own risk, it is not the responsability of the designer, if you want guaranty, go in shops with legal guaranties, but it is fair to repeat it is at your own risk and of course to be prudent (the diyer can be injured too). Anyway, better to follow the datasheets, the ic designers know more than the people whom use them.
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Yes in LTspice, but how will it behave in another environment, with another power supply or stage behind I/V. AD811 is also very stable in LTspice, but the reality is something else.@grunf You can simulate TPA6120 in ltspice using model THS6012, including parasitistic capacitances and inductances ... it is very stable 🙂
Rubycon mu handles 400C, it's as tough as nails 🙂The foil SMD capacitors are very fragile during soldering, you can easily damage it with high temperature
I/V based on TPA6120
edited post #9463 (added R3, R4 on the output signal, hole in the GND under the feedback trace)
Power supply range is from +-5V up to +-15V. It can be powered directly from DAC PSU.
R1 and R2 value determines the output voltage. For a higher output voltage use higher value of this resistor (1k5 == 1.5Vp, 2k7 == 2.7Vp, ...).
R3 and R4 resistors melf 0204 or SMD1206, value 22R up to 100R.
Capacitors are polypropylene and a high quality electrolytics (UKW from Nichicon is still available).
There is hole in thermal pad under the IC, where you solder the IC with PCB from the bottom.
IL, IR is current input from DAC.
VL, VR is voltage output.
Note, that a small (not harmful) DC offset may be present in the voltage output.
This is redesigned PCB and so far not tested.
BOM example: https://mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=5ca5f6fb0b
edited post #9463 (added R3, R4 on the output signal, hole in the GND under the feedback trace)
Power supply range is from +-5V up to +-15V. It can be powered directly from DAC PSU.
R1 and R2 value determines the output voltage. For a higher output voltage use higher value of this resistor (1k5 == 1.5Vp, 2k7 == 2.7Vp, ...).
R3 and R4 resistors melf 0204 or SMD1206, value 22R up to 100R.
Capacitors are polypropylene and a high quality electrolytics (UKW from Nichicon is still available).
There is hole in thermal pad under the IC, where you solder the IC with PCB from the bottom.
IL, IR is current input from DAC.
VL, VR is voltage output.
Note, that a small (not harmful) DC offset may be present in the voltage output.
This is redesigned PCB and so far not tested.
BOM example: https://mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=5ca5f6fb0b
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@diyiggy My first exploded capacitor was without glasses, not hitting me, but my surprise was like "well, this was projectile"![]()
yeah, many of us experienced that I believe, me the first ! Very noisy and toxic as well to smell !
You are correct, I can go that routeYes, but shipping from Europe you can have it directly from jlcpcb
...
As said Brijac to me, "read the datasheet"...@diyiggy That toxicity has infiltrated our DNA and made us forever addicted to DIY![]()
I should have guessed a cap couldn't be used as suppository! I am deeply infiltrated....
I just seen at the breakingnews it can be dangerous when you do not use bipolar ones....😱🤣 Bang....
For the prepared ReClock with Inputs selector, here I wrote simple tutorial how to program CPLD without a single line of code, just using schematic 😎
https://electrodac.blogspot.com/p/programming-cpld-using-schematic.html
That way you can conveniently transfer almost any digital circuitry into the CPLD (the well known EPM240T100C5 from aliexpress) and test it on your DAC without spending tons of money for another "broken" PCB due to a bad routing or another possible errors 😊
Example:
You can take the ecdesigns digital input schematic of TDA1541 and transfer it into CPLD and test it for your TDA1541. Then you can take my schematic and test it. Or you can take digital logic from AD1862 and add inputs selector. All this with one device without spending another money for digital PCBs 🙂
https://electrodac.blogspot.com/p/programming-cpld-using-schematic.html
That way you can conveniently transfer almost any digital circuitry into the CPLD (the well known EPM240T100C5 from aliexpress) and test it on your DAC without spending tons of money for another "broken" PCB due to a bad routing or another possible errors 😊
Example:
You can take the ecdesigns digital input schematic of TDA1541 and transfer it into CPLD and test it for your TDA1541. Then you can take my schematic and test it. Or you can take digital logic from AD1862 and add inputs selector. All this with one device without spending another money for digital PCBs 🙂
How does it sound ? compared to AD711 or 1655? ThanksI/V based on TPA6120
edited post #9463 (added R3, R4 on the output signal, hole in the GND under the feedback trace)
.....
Note, that a small (not harmful) DC offset may be present in the voltage output.
This is redesigned PCB and so far not tested.
BOM example: https://mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=5ca5f6fb0b
Hi miro@mehdism IC1 must be 74HCT164, you have only HC version ... it would be good if also other shift registers are HCT version 🙂
But the problem can be also in TDA1541, not all are good, some can have defects because all were used previously 🙂
Regarding DC offset, please note that the USB cable from USB-I2S device must be connected in computer during all testing and set-up. When the computer is off there can be always some dc offset on the output 😊
I replaced ic1 with 74HCT164, but without c15 high frequency is noisy,so put the 680pf on c15 dac working good .
Can I use the CPLD instead of shift register to solve the problem?
@mehdism Sure you can try CPLD, it is very good solution for TDA dacs, follow this tutorial:
https://electrodac.blogspot.com/p/i2s-to-tda1541a-converter-tutorial.html
If the C15 is solving problem, use it too 🙂
https://electrodac.blogspot.com/p/i2s-to-tda1541a-converter-tutorial.html
If the C15 is solving problem, use it too 🙂
I like the TPA6120 more, however, it is a matter of subjective taste. TPA is very natural and is not expensive to try 😊How does it sound ? compared to AD711 or 1655? Thanks
TPA6120A (=THS6012) is very good, but as for me - OPA1622, OPA1656, AD8397 (=AD45048) are better.
Alex.
Alex.
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