For the money go for z foil. Same technology, better specs. Unless it's smd designed pcb, then yes use that one. Foil resistors are really nice in riv position 🙂
I don't see the point of using those resistors in this scheme. Neither is in the way of the signal, nor is great precision required.
It is better to invest your resources in high-quality regulators and matching transistors, because their influence on the sound will be much greater than the choice of resistors themselves.
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yeah, chose the resistor to voice the final sound in relation to the decoupling cap around and how is voiced the rest of the hifi. Can not go wrong with the ref (through hole) I liked (read the thread).
Do know Pedja is using brandnew low noise smd Toshiba iirc in his AYA5 diy project. But nothing wrong with throuhole transistors. A clean ground with a 4 layers pcb will be better. Non matched transistors can ge you sometimes something nicer with more H2 (pleasing to the ears).
Try to find @Painkiller thread about ad1862 with Pedja's I/V stage. Just in case: you just need the fet transistor with the TDA1541 and not the AD1862.
Try to find @Painkiller thread about ad1862 with Pedja's I/V stage. Just in case: you just need the fet transistor with the TDA1541 and not the AD1862.
I didn't do a very extensive I/V resistor test, but I ended up with the Rhopoint 5G10 Mini-Ohm Series. I prefered them over the Vishay's that I initially used. The AD1862 thread is interesting to read now. I think it's titled "AD1862 PCB layout". My project started almost 10 years ago, and the dac has stayed in my system for many years now. I sometimes wish I kept evolving the design to make a full board with all the power supplies and reciever integrated. It's still a rat's nest. But it just sounds so sweet.
I am glad you liked the Rohpoint 😉 ! I haven't included it in my test in Miro's thread cause my 5G10 had too short leads for Miro's ad1862 board. I liked it though on your board Painkiller 🙂. Due to the character of the ad1862, the Rohpoint is a good match as the one I selected in that thread after testing with op1656.
When I will have more time I'd like to make a multibit dac for active filtering (so w/o ADC) with ad1862 with such I/V stage.
When I will have more time I'd like to make a multibit dac for active filtering (so w/o ADC) with ad1862 with such I/V stage.
I see now that I also tried the Vishay R55, a regular metal foil resistor and the vishay naked z-foil. But the winner was the Rhopoint. They cost $20 USD per piece now. Worth a try.
Hi @diyiggy, if I understand correctly, the OPA1655 is the mono single channel of the 1656. Can you tellme why you opted for the 1656 instead of the 1655? I also ordered the 1656 for my build (not yet started) and then realized it may not be needed. Many thanks.
The OPA1655 was released after the 1656.
So an adapter board used with OPA1656 configured it for 1 channel use.
No need to convert the OPA1656 anymore, just use the 1655 from the beginning.
So an adapter board used with OPA1656 configured it for 1 channel use.
No need to convert the OPA1656 anymore, just use the 1655 from the beginning.
Ahh, I missed that one Brijac. Nice 😉.
I handled the conversion this way:
#1,140
@audiosteve, moral of the story is your good to go with the opamps you already have
I handled the conversion this way:
#1,140
@audiosteve, moral of the story is your good to go with the opamps you already have
I'm gonna order some 1655's. I meant to do that in the first place and did not,.
Or.... maybe I'll use the OPA1641's I have on hand. Does anyone think one or the other is preferred? Or something better to use with the existing socket?
Or.... maybe I'll use the OPA1641's I have on hand. Does anyone think one or the other is preferred? Or something better to use with the existing socket?
I'm gonna order some 1655's. I meant to do that in the first place and did not,.
Or.... maybe I'll use the OPA1641's I have on hand. Does anyone think one or the other is preferred?
Or.... maybe I'll use the OPA1641's I have on hand. Does anyone think one or the other is preferred?
To me best ic opamp is opa 1656(1655) in most stuff i heard. Hands down. But this is where tastes come to play.
I agree Brijac, the OPA1655 was my preferred opamp if using the stock MiroDac I/V section.