Pars

Yes, 0.1% thin film was my target resistor. The IRC/TT PFC was my initial target. I have had to go with the Vishay TNPW for many of the values. I was also going to look at the Panasonic ERA series from Digikey as well. Kevin, it looks like you are running traces in between the pads on the board pdf I looked at for the V2, so I could see where going smaller on the resistors could be a problem. Hopefully the kids will keep stocking reasonable sizes such as 1206. A newer IRC series they advertised on Mouser comes in 0805 as the largest package. I'm not sure what size the caps were on two of the PSU daughterboards in the Panasonic plasma I have, probably 0402 or so, but they were awfully damn small when I fixed it.

Thanks Kerry. The calculator values as I have them using either 100K or 1M input matches what you had (E96), other than RT which is 10K in yours. The multiamp doesn't have an input to ground resistor, though most of Kevin's amps do. I had wondered whether this one should actually have one as you mentioned, as it does have low input impedance when using the bipolar THAT chips. I'm using FETs in mine, but thought I would set the digital attenuator up in case I were to use the bipolar. A number of the thin film IRC/TT values are not stocked by Mouser (both for the 25K and the 10K). I have found most if not all of the values, but many are Vishay TNPW instead. The 1.87K is a problem (KOA Speer only), and the 6.0R isn't available (6R04 is in a 1%). I'll post the part numbers from both Mouser and Digikey once I have them ironed out. Is the V2 board set up for 1206? It seems like availability is much better the smaller you go. 0805 seems to hit most of them, as does 0402 , which seems silly small. I've worked with 0805 before and they aren't too bad.

Looking at Kerry's previous 10K resistor values BOM and comparing to amb's calculator, I had some questions. Here is Kerry's listing Input Z = 10K 562R RS0 2 169k RP0 2 1k1 RS1 2 82k5 RP1 2 2K05 RS2 2 38k3 RP2 2 3k65 RS3 2 16k9 RP3 2 6K04 RS4 2 6k65 RP4 2 8k45 RS5 2 1k87 RP5 2 9k76 RS6, RS7 4 255R RP6 2 6R00 RP7 2 10K RT 2 From amb's calculator, I had a couple of differences, but I'm not sure I set it up correctly as far as input impedance for the multiamp, etc. With Rload = 1M with Rload = 10K I also ran it with Rload as 100K, which might be more realistic. Results were the same except for an 11.0K Rt

I had gotten a Technicolor router/modem from them initially but it was in bridged mode (I presume... Airport wouldn't work plugged into Ethernet port 1). Since I was getting more throughput with my Airport/Arris combo, I never went further trying to set it up. The phone didn't work initially either.

Is this the case with the group buy boards?

Also, is there a schematic for this around?

Is it still an issue if using FET input? I believe the 1st BOMs were for 10K? I presume the Rt termination resistor = 10K is what I am looking for?

We're on Comcast in Chicago, but have triple-play. What would the recommended voice modem be for us? Arris TM822? We're still using a previous-gen Airport Extreme for a router. I have a Comcast X-1 class router (Cisco something or other), but kind of wanted to keep using our own router. I'm actually using the previous Arris 622 modem (IIRC, might be a 722) which doesn't get us our full speed. Apparently with any of the Comcast-supplied routers, you cannot put them into bridge mode yourself... Comcast has to do it. And they apparently default to their non-bridged configuration if they reset, requiring another phone call. If any of this is incorrect please correct me.

I was just looking at the 24.3K BOM and Mouser, and it appears that Mouser doesn't stock 6 of the resistor values anymore (in the IRC/TT PFC 1206). If anyone has already worked through this problem, let me know. Also, I assume that this version of the attenuator (Kerry group buy, 24.3K impedance) would work fine with the Multiamp? Timely, I know Chris

Would changing to discrete input diodes, perhaps even Schottkys (31DQ10?) help for this?

RIP Kenny and Omar I grew up as a huge Raiders fan during that time frame.

That's what I thought as well, but I was under the impression that the industrial ratings were twice that of the mil-spec, not 4 times as this shows...

The modified e12 boards that I laid out and home etched had a PSU ground connection on them and this was what I used for the comparator ground, not the virtual ground. The vgnd bounced around too much, particularly before he went to the rail to rail relay. I understand the explanation of why 2 boards may not work as well, so thanks for that. One thing I hadn't considered with the summing.

Wouldn't two e12s work for balanced; 1 for the + signals and 1 for the - signals? On amb's site, he only states that 1 e12 per PSU should be used, which I'm not quite sure I understand the rationale for. I never cared for the virtual ground on the e12 board, but understand the need for it given some of the amps that this is intended for. I agree that your protector board would be better and more economical.

Yes, I really enjoyed this as well. LeMond was a monster before he got shot. I've watched a bit of this years tour, but didn't see yesterday's stage and crash.

Used to be National, but they are owned by TI now (probably still fine). Philips (On Semi) are good as well. Never tried JRC. Anything buy ST Micro. Thing should regulate regardless of load. Their positive ones do Ooops, On Semi was Motorola, not Philips. Philips is NXP, which probably are also good.

^ This! Congrats USWNT, and to Japan, who even though getting crushed, never showed quit and remained classy in their play.

Seems pretty clear on my read of it Kevin. Styles A and D (ALC10Axxxxxx) are 2-pin. Termination G (of the 2 std. terminations) is 5-pin, but is only used for diameters greater than 45mm. From what I could see Mouser only carries the A termination type. KEM_A4020_ALC10-535355.pdf

Happy Birthday Birgir!

Happy Birthday Greg!

RIP Chris. Agree Dusty, a great bass guitarist, and one of my favorites as well.

Happy Birthday Justin!

Thanks for the well wishes guys, and hope MOA is insane and bliss-filled :

Got released from the hospital. On Tuesday and Wednesday of this week, around 4:00 in the morning I was waking up with an odd feeling. A bit of chest tightness, arm tightness, etc. All pretty minor but just uncomfortable. Sit up for an hour or so and go back to bed. On Wednesday around 2:00 I went outside to do some work, and just wasn't feeling right. Called my doctor and after talking to one of his nurse's, had my wife take me to the ER. After angioplasty, 100% blockage in the RCA, one stent. Fun fun, but I guess still being here counts for something. Got out a day earlier than normal because I was doing so well.

I just bought a used pair of Wellgo B-67s; still haven't tried them yet. The Ergons seem expensive for what is basically just a flat pedal. Some reviews I read claim traction, while good, isn't as good as pins, etc. Of course these probably wouldn't fuck up your shins in a mishap like pinned pedals might. The Shimano dual purpose pedals like Grawk has might be a better choice, as you could go clipless if you wanted to.