Using another 24 volts regulated power supply in series with 1R resistor, I measured current draw of 120mA with both opamp and 105mA opamp removed. No wonder using the earlier supply the voltage drop so much coz its only rated 100mA. The opamp is warm while all the buffers are quite hot to touch...

Thank you. But why is that the left channel sound louder than the right channel even with opamp change. I don't have 470R and will get some. In the mean time will test using 2 fully charge 9V battery.

Hi Tangent, After running my Pimeta for a few days I noticed that the right side sound much lower than the left. Upon checking I discover the following: 1) High current draw from regulated 24 volts supply using LM317. 2) Voltage drop from 24V to about 12V (+/- 6 V on opamp) 3) R1/R2 on LM317 is...

Hi Tangent. Thank you for the PCB and Alps Vol which were delivered last week unopened. It takes only 8 days compared to 42 days last time. I have completed my Pimeta V2 and I am so happy that it works the first time. I am using OPA 227/2227PA and I have to get use to the tremendous bass it...

Thank you for your reply. FYI, I finally received the Pimeta V2 PCB and I am really impress with the quality. It is the best that I that I have seen so far. Btw, I am still using Pimeta V1 and I really enjoy listening to it. I hope the V2 will be an upgrage. :)

Thanks for the reply. I will wait for the board, better late than sorry. Btw, back to C4 issue, I have read the doc, but it does not mentioned anywhere about the size ot tant caps. You only mentioned that easiest to use are 7343 surface-mount caps. It is better to use the same size i.e 6.8uF...

Ok then, I wait another week or two. Then what? I have to place another order. Is it insured? Thank you.

Tangent, I ordered 2 sets of Pimeta2 PCBs and parts on Aug 15. According to the tracking no LK074729587US, it has been shipped out on Aug 16. However, until today, I have yet to receive the goods. Usually it only takes about 2 weeks for shipment from US to Malaysia. I have contacted the local...

1) I have question about R11. Tangent says that its 667X power suppy. So if my supply is 24V, the R11 should be 7.3K. But using 7.3K the current limit for 24V is 24/7.3k = 3.3mA. If I want to limit current to 300mA using 24V the appropriate value should be 24/0.3 = 80R. Can someone please help...

I have always used Black Gate HiQ 0.1uF/50V to bypass the op amp in all my mods, CD player, DAC etc with excellent result. I am also the proud owner of M3. I am using M3 not only for headphone but also to drive my fostex 206E speakers. I am a tube fan but I can live with M3. I have been...

I have always use Black Gate HiQ 0.1uF/50V to bypass the opamp in all my mods, CD player, DAC etc with excellent result. I am also the proud owner of M3. I am using M3 not only for headphone but also to drive my fostex 206E speakers. I am a tube fan but I can live with M3. I have been listening...