We got the isomet amplifiers. These are higher efficiency and can be modulated, so you can make intensity stabilization and such. I put one in a chassis with power supply. You could put 2 - 4 of them as a package. Use a switches and headers to allow easily swapping amps or supplies.
The isomet amps have some LIGO docs up at https://dcc.ligo.org/LIGO-T1900049
This chassis setup can/should be used to package the minicircuits amps as well.
daniel-grass
What is the plan for these vs the mini-circuits ones? Should we switch them all right away, use mini-circuits for a while, or something else?
lee-mcculler
The minicircuits are OK, but the isomet ones should be the better product. They take a lot less power/heat load and they have a modulation input that allows one to make intensity stabilization servos with them
I only got two. I'd suggest at least trying to use one of the isomet ones since they are here. The minicircuits may be here now too already?
readout cavities don't need intensity stabilization, so the minicircuits are fine. They take the same voltage so if you use switches and those green power connectors well they are easy to swap
daniel-grass
They arrived at Caltech this morning but aren't in bridge yet
lee-mcculler
then use either. I would put the existing minicircuits ones in a chassis though. I don't know that you can fit 4 and I don't know that those power supplies can feed 4 of those
don't the minicircuits ones draw like 0.9 amps or something?
daniel-grass
I'm not sure
And which power supplies are we using for the new amplifiers?
lee-mcculler
I'd prefer if we use these non-configurable ones for things that don't need configuration or current limiting
https://www.digikey.com/en/products/detail/excelsys-advanced-energy/UX4-06/12365025
most of the outputs are the xgF https://www.digikey.com/en/products/detail/excelsys-advanced-energy/XGF/4506603
two of the outputs on the pictured chassis are the xgK
those xgK outputs can deliver 9A of 24V, so they can run all of the amps
daniel-grass
Cool. @alex-ramirez @torrey-cullen does one of you want to help me make some chassis tomorrow?
lee-mcculler
the pots on the back tune the output voltage
the idea is that you go power <-> connector <-> fanout <-> switches <-> connectors <-> amps (and other applications)
so that we can move the power out of the chassis later if desired, and individually power and disconnect amps.
https://openproject.mccullerlab.com/projects/purchases/work_packages/199/files is the order, if we need more connectors. Those 5-pin green connectors are great, I wish we had perfboard that could fit them, but soldering wires directly to them is OK. You'll just want to strap them down somehow
holes and zipties in those chassis are still way way better than all that stuff just floating around the lab