kevin gilmore

has to be a $25 switcher in there. those things die all the time. Really easy to replace. pics and we should be able to find a replacement. there actually is a fuse on the power supply, looks like a resistor, and if its blown, likely the rest of it is toast, but I have been known to fix them if necessary.

you need transformers with higher output voltages. probably custom transformers.

updated the file. the caps are 25mm

Should be just fine

here is the version with the to220 sic diodes, someone really needs to check this goldenreference6drflipto220.zip

because soren is running the grlv supply at 4.5 amperes, here is a new version with the feedback resistor locations flipped so that the sense is not one inch away from the output connector. sense is now tied directly to the inner power supply connector. So the 20mv change in voltage due to current should be completely canceled out. for higher currents, best if the board is made with 3 oz copper. goldenreference6drflip.zip

He is anything but grumpy these days. Probably there are 2 reasons.

can't do 5V. best you can probably do is 12V and then you still have to change the reference to a 5V reference check C3 to make sure its not in backwards

check the values or r9 and r10, it looks like everything is working right if both input pins of the opamp are at -10v

BOM for the GRxx boards GR79.csv GR78.csv By the way, linear technology is now owned by analog devices, and you can buy these parts from mouser.

Looks close to the original dual board but bigger. I did not verify the wiring.

with the opa134 you are limited to 36v. you can certainly change that opamp to opa445 and then it would work up to higher voltages. going to check on the ratings of the transistors now edit: subject to the voltage ratings on the capacitors, so probably 35v

from Kerry, the gr78xx and gr79xx board files I want a few of each if there is going to be a group buy GR79xx.zip GR78xx-v1-2.zip

That should work also since it's normally closed could be used for startup and shutdown

yes but the opamps are wired regulated to ground so a opa134 is good for up to 36v output voltage

direct sunlight is definitely a bad thing

8.7 sp1 as of 1 month ago, but a lot of the stuff should be 8.4 or earlier try a standard gerber viewer. there should be no configuration or setup issues

All the newer gerber x2 stuff most likely. Can't make older gerber files with the new software

that340lsk.zip

I have always wanted a revox a700, but have absolutely no use for it. All it would be is a time sink to keep it working.

http://www.chicagotribune.com/entertainment/music/reich/ct-ent-willie-pickens-dead-1214-story.html

to save space I sometimes do vertical resistors. but everything else is wrong with that amp.

no servo so blackgate output caps on a solid state amplifier taking 1/3 of the board space. yep, great idea

here is why you probably don't want one unless its dirt cheap. you will need to add heatsinks, not easy, and fix all the acetate failure

the singlepower squarewave definitely does not like low impedance loads (50 ohms) making it balanced causes even more trouble. very few of the balanced versions were built, and they are balanced out only when balanced in, and depending on the power brick, they burn up real easy.