Leonhard Bandilla
@lbandilla.bsky.social
Pinned
Leonhard Bandilla
@lbandilla.bsky.social
· Jul 30
Building a fluorescence based piece of equipment on a budget? Here are my top 3 budget options, all very usable with different Pros/Cons:
* Small narrow bandpass filters from Aliexpress, around 1€ for 8x8mm, decent OD, 20-80nm FWHM, angle sensitive. Ideal for non imaging purposes or shallow angles
* Small narrow bandpass filters from Aliexpress, around 1€ for 8x8mm, decent OD, 20-80nm FWHM, angle sensitive. Ideal for non imaging purposes or shallow angles
There are so many budget friendly portable spectrometers available, I thought I'd post some photos of when I opened one, an hopocolor HPSC330, to replace the battery and recalibrate it afterwards. It seems to use a crosses Czerny-Turner geometry with a linear CCD
September 27, 2025 at 2:02 PM
There are so many budget friendly portable spectrometers available, I thought I'd post some photos of when I opened one, an hopocolor HPSC330, to replace the battery and recalibrate it afterwards. It seems to use a crosses Czerny-Turner geometry with a linear CCD
I figured out the tricks of how to cut thick boro now:
* A tap wheel cutter with a lot of pressure
* Take note of tin and air side, in my case I use the same side the factory score marks are
* Tap the score both sides with a hammer/end of glass cutter
* Be decisive when you break
* A tap wheel cutter with a lot of pressure
* Take note of tin and air side, in my case I use the same side the factory score marks are
* Tap the score both sides with a hammer/end of glass cutter
* Be decisive when you break
August 24, 2025 at 7:28 PM
I figured out the tricks of how to cut thick boro now:
* A tap wheel cutter with a lot of pressure
* Take note of tin and air side, in my case I use the same side the factory score marks are
* Tap the score both sides with a hammer/end of glass cutter
* Be decisive when you break
* A tap wheel cutter with a lot of pressure
* Take note of tin and air side, in my case I use the same side the factory score marks are
* Tap the score both sides with a hammer/end of glass cutter
* Be decisive when you break
Does anyone here know how to cut thick (6.5mm) borosilicate glass, especially cuts close to the edge? I've tried carbide and diamonds cutters, diamond with a heavy but smooth score seems to work best but I'm still having issues with it deviating to the side when close to an edge.
August 17, 2025 at 6:25 PM
Does anyone here know how to cut thick (6.5mm) borosilicate glass, especially cuts close to the edge? I've tried carbide and diamonds cutters, diamond with a heavy but smooth score seems to work best but I'm still having issues with it deviating to the side when close to an edge.
Have you ever had the need for a custom size glass filter or first surface mirror or need many at a low cost? You should know cutting them yourself from a larger stock is a lot cheaper and not nearly as hard as you'd think with a regular high quality glass cutter.
August 10, 2025 at 4:42 PM
Have you ever had the need for a custom size glass filter or first surface mirror or need many at a low cost? You should know cutting them yourself from a larger stock is a lot cheaper and not nearly as hard as you'd think with a regular high quality glass cutter.
Building a fluorescence based piece of equipment on a budget? Here are my top 3 budget options, all very usable with different Pros/Cons:
* Small narrow bandpass filters from Aliexpress, around 1€ for 8x8mm, decent OD, 20-80nm FWHM, angle sensitive. Ideal for non imaging purposes or shallow angles
* Small narrow bandpass filters from Aliexpress, around 1€ for 8x8mm, decent OD, 20-80nm FWHM, angle sensitive. Ideal for non imaging purposes or shallow angles
July 30, 2025 at 5:07 PM
Building a fluorescence based piece of equipment on a budget? Here are my top 3 budget options, all very usable with different Pros/Cons:
* Small narrow bandpass filters from Aliexpress, around 1€ for 8x8mm, decent OD, 20-80nm FWHM, angle sensitive. Ideal for non imaging purposes or shallow angles
* Small narrow bandpass filters from Aliexpress, around 1€ for 8x8mm, decent OD, 20-80nm FWHM, angle sensitive. Ideal for non imaging purposes or shallow angles
Reposted by Leonhard Bandilla
Science/academic peeps: there was a thread over at the other place (or maybe a blog post) a while back on how to write a good letter of rec for a prospective grad student. Anyone have a link handy or remember whose thread/post it was? Thanks! 🧪
October 22, 2023 at 3:04 PM
Science/academic peeps: there was a thread over at the other place (or maybe a blog post) a while back on how to write a good letter of rec for a prospective grad student. Anyone have a link handy or remember whose thread/post it was? Thanks! 🧪
Does anyone know where to get the control software for the Crystal Technology AODS 20160? The one website I've found doesn't have the download link anyone and I can't find it anywhere.
October 11, 2023 at 5:12 PM
Does anyone know where to get the control software for the Crystal Technology AODS 20160? The one website I've found doesn't have the download link anyone and I can't find it anywhere.
I might be buying some rare earth oxides, including lanthanide oxides, from China soon. Just wondering if anyone needs anything in that direction, if so I can add it to my order.
October 9, 2023 at 4:36 PM
I might be buying some rare earth oxides, including lanthanide oxides, from China soon. Just wondering if anyone needs anything in that direction, if so I can add it to my order.
Does anyone know a good way to detect a 100kHz signal? It is a sine wave with a level of +/-5V max usually in the mVs. I've tried the classic dual op amp/two diodes full wave precision rectifier and it works in an ideal situation but doesn't work IRL or with realistic simulations
October 5, 2023 at 2:16 PM
Does anyone know a good way to detect a 100kHz signal? It is a sine wave with a level of +/-5V max usually in the mVs. I've tried the classic dual op amp/two diodes full wave precision rectifier and it works in an ideal situation but doesn't work IRL or with realistic simulations
Sometimes you do what you gotta do to get your measurements
September 9, 2023 at 8:35 PM
Sometimes you do what you gotta do to get your measurements
Same thing on here, if you know someone you want to bring over to here, let me know, I got one code.
September 1, 2023 at 9:25 AM
Same thing on here, if you know someone you want to bring over to here, let me know, I got one code.
Sometimes you just don't get a lot of space to work with. There will be modules where the headers are, one Arduino Nano ESP32 and one ADS1259 ADC
August 28, 2023 at 5:43 PM
Sometimes you just don't get a lot of space to work with. There will be modules where the headers are, one Arduino Nano ESP32 and one ADS1259 ADC