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PPAS Build Thread. - Page 10

post #136 of 254
ATAT are you selling me any PCB's?
post #137 of 254
Thread Starter 
MikeNAS, send me your address and number of boards.
post #138 of 254
Does anyone have extra C5/C7 caps that I could buy? I need a pair of the 20V tantalum caps.
post #139 of 254
Thread Starter 
Bipolar and unstable opamps are now confirmed working.

on a fully charged NiMH, I'm getting about 1.3 mV offset from the combination AD8058 / LM6171... sounds great.

Now the amp can use the LM6171, LM6172, AD8058, AD8057, ICs.

Revised BoM and bypassing mod instructions will be posted in a bit.
post #140 of 254
Thread Starter 
AD8058 has issues with high gain.. not sure why I'll figgure this out later. (up to 70mV on a gain of 5)

For now, I've completed this..
LM6172/LM6171/LMH6321.. impressions later..
Runtime 5xAAA NIMH - 7.5~6 V at 24 hours- with charger.
Size.. see pic.




Sorry about cameraphone..
Also, DC jack not yet soldered.
post #141 of 254
Thats a lil one. Someone needs to make Hornet sized knobs for 6mm shafts.
post #142 of 254
Did you cut down a C801? That's teeny.
post #143 of 254
Thread Starter 
Yearp.. in a C801.. with LMH6321s.. now my RS-1s can sound good on the go

Scary thing is.. the batteries can charge using a 9v battery...
post #144 of 254
Can anyone with the OPA2107/LM6171/LMH6321 combo measure the voltage drop across each SST310 (Q1/Q2/Q3/Q4)?
post #145 of 254
Quote:
Originally Posted by Teerawit
Can anyone with the OPA2107/LM6171/LMH6321 combo measure the voltage drop across each SST310 (Q1/Q2/Q3/Q4)?
Don't have mine on me... but I'll be able to measure it after the weekend.
post #146 of 254
Or OPA2107 + LMH6321 + any ground...

please
post #147 of 254
Thread Starter 
Across the SSTs? should be zero (or close to it).
post #148 of 254
The PPAS I have with me at the moment is running OPA2107/AD825/BUF634. Sounds pretty good, lot of soundstage and detail. I still like my AD8058/AD8397 PINT better at the moment, though. I blame the BUF634s to some degree, though. I hope we can get an AD8058 configuration working on the PPAS. I need to get parts to try it myself.
post #149 of 254
Quote:
Originally Posted by ATAT
Across the SSTs? should be zero (or close to it).
Um, no?
post #150 of 254
Thread Starter 
Wait. which pins.. 1 and 3 should be zero (since they're shorted.. duh)
The others should be around 4.5 volts (at least thats what I measured on non-new 9vs)
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