luvdunhill

don't raise the pot. Keep it 20K. Lower R17 and R18 to the values I suggested (in reading past posts, it looks like you didn't change these and kept them at 20K, is that right?). If you're only using two devices, go even lower for R17-R18, say 2K. Probably easiest to just parallel another value on the back of the board. What are the two resistors at the alternative feedback point? Did you use the recommended 2K? Perhaps we should find the ref designators for these parts so we don't confuse each other....

Here's what I would do. I'd try two pairs, have a DMM across one of the output resistors and turn it on and let that value settle. I'd leave it on less than 30 seconds or so, no longer. And immediately turn it off if say current is insane (1A) (I'd hook it up to a heat sink, but you could perhaps skip this if you're really careful). While it's on, verify that turn the pot up increases this value. Extra points for using two meters across, one for each FET. It might take a bit of travel for it to come up, but when it does it will come quick in this configuration. Record these values. Add another pair of FETs and repeat. Reset the pot. Again, one meter on one of the n-ch and another on the one p-ch output. Record these values. If these numbers are high (high, meaning relative to what you think your heat sinks can provide, that number is up to you to decide.., but post them here and we can philosophize) then we can go from there. I'm 80% sure it will be okay with 4 FETs but doing it with 2 might be a good exercise. I don't have any devices readily available

ok, but remember that the thing adjusts differently than the Dynahi (note amb mentions "bias" and well, you have a separate pot for that). I'd just set them at 500 and leave them and use one to adjust for offset. Like I said, I'd only install a single pot and a fixed 500 ohm resistor. Also, be careful in installing less output mosfets. You'll likely need to change the Vbe multipler values (the pot and series resistor) to accommodate. I'm sure I mentioned that somewhere in this thread, in response to someone wanting exact values for the parts. It will take experimentation, sorry.

you're probably better off just installing a single trimmer on CCS and using a fixed resistor on the other. What you have is fine for now, but once you start playing with it, it's easier to adjust one side and then get it close enough that the servo can handle things from there on out. I bet it even sounds a bit better that way.

Is this the sort of thing that super glue was invented to do, or is that an an urban legend..

x2 especially in Tapatalk. Are there fewer posts per day since the new software was installed?

meh, here's what I've done when people have sent me boards like this: 0.) remove the device 1.) use a heat gun and heat up the heat sink. Use a heat shield to avoid the PCB. Get 'em hot 2.) thread a piece of string through the hole so you have something to pull 3.) Use Chip Quik 4.) pull They pop right off, even on the beta22 boards where the holes are too small and pads too lame.

Let's say your right. However, that's not nearly as rewarding as say, building your own ES amp

one more point. The T2 has an input filter that is used to protect the input from unwanted RF signals. However, what many people don't typically realize (as they leave this filter off) is that this filter has a side benefit of improving the bandwidth of the feedback signal in various topologies, for example a differential pair input. It's a subtle point, but one worth mentioning here.

Justin, don't forget that the original did not need any compensation in the output stage as well.

wow, I like that Mike as well. Very good choice!

isn't this the part when you complain that Justin's specs of 5Hz-45KHz +/-0.1dB aren't accurate and demand your money back? I guess that's more HF, but if you post it over there be sure to update us with the ensuing reaction.

Nice Jim, cannot wait to hear your impressions. The Asyla mixes up well.

you do know that it's possible to clip test probes to things, you don't have to hold them. It's a relatively new invention...

Oh. I tried some amarone recently. That was probably the best wine I've ever had. ok, out for the night.

Cool, I'll buy the winner. They have an olde and younge Boomsa here, which are you going to try?

A ton of Old Eatonians. I think this is one of my favorite gin drinks, especially when I run out of fruit. Killed off my Hendricks and Blue Coat and nearly the Cocchi. Feeling fine.

Randomly ran into a bottle of Handy. Then bought it.

No, but I'd buy the Junipero if I was trying it for the first time

actually, you probably need to either have the pot connected or the inputs shorted.

maybe this link would be interesting? I think the Auer style is the same as the Russian style: http://dspace.uta.edu/bitstream/handle/10106/128/umi-uta-1292.pdf?sequence=1

see.... Did you ever see him use the last 4-5 inches of the bow? I cannot find the mystery Bach sheet music now. I think I'm going insane. It's not as pronounced as I though, but as I understand it, this is the Russian method, but with more slant towards the wrapping. some other pics

nice! looks like it uses the same steel as my knife.

it's a cocktail. They have cool names

Corpse Reviver #2. Equal parts, with Meyer lemons and two drops absinthe (with St. George a 1 dash / 1/8 tsp is a bit much)