OK, so I've tried this, and I think all is well. The reduction in noise is (subjectively) bigger with the LM337 than LM317, but that is purely subjective, so treat that observation accordingly.
Again, thank you all for the help in understanding and getting these running properly.
Again, thank you all for the help in understanding and getting these running properly.
Add a DPST relay to the PCB and drive its coil with a five second delay circuit. Voila, sharp and equal risetimes on Vreg_pos and Vreg_neg.
Hi Trileru,
I have 0.35V across C20, what flexibility can i have? Thank you! Maxpou
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Placing a provisional multiturn pot in R12/R18 it's more or less mandatory to find the right resistor.
Hi trileru,
i have approx 1 volt when i start and drop to 0.35V. Do you want I do another test? thank you! Maxpou
i have approx 1 volt when i start and drop to 0.35V. Do you want I do another test? thank you! Maxpou
0.04V and the voltage up slowly and it stabilizes after 10 sec at 7.49V. The higher peak is 7.52V Maxpou
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That's nice and low.
I noticed on the NoNoiser that the base of the ADJ pin BJT is pretty sensitive. I had a hard time measuring with DMM across the coupling cap. Worked better to measure GND-base of ADJ pin BJT and GND-collector of denoiser BJT and subtract the values to get the voltage across the coupling cap. At least in my case.
I noticed on the NoNoiser that the base of the ADJ pin BJT is pretty sensitive. I had a hard time measuring with DMM across the coupling cap. Worked better to measure GND-base of ADJ pin BJT and GND-collector of denoiser BJT and subtract the values to get the voltage across the coupling cap. At least in my case.
Ok, now i'm ready to install this circuit in my COD DAC for digital section🙂 or i haveto do another test? thank you! Maxpou
Elvee,
Is it possible, or an absolute atrocity, to share one 3x7 with two denoisators? My feeling says it's not, but your expert opinion would better explain why.
Is it possible, or an absolute atrocity, to share one 3x7 with two denoisators? My feeling says it's not, but your expert opinion would better explain why.