Several months ago we wrote a short write up about making a cheap optical shutter out of a hard drive disk controlled via Arduino. Since then we have had two Uniblitz shutters fail. We have now seen 6 Uniblitz shutters seen fail relatively quickly, with different users and different use conditions, over three labs. Even […]
Month: September 2019
ODX: $25 For Turbidity (OD) Measurements
A couple of weeks ago we covered MicrobeMeter. At $420 it’s not exactly pennies, but you can buy it pre-built or as an easy DIY kit. For a similar price, we also covered a user friendly low-cost turbidostat. But now we are aware that there is a cheaper option. A much cheaper option. Ganga C. […]
Stimjim: Open Source Electrical stimulation for $200
Neural stimulators can cost thousands of dollars. But why buy them when you could build a StimJim for just $200? StimJim is a dual-channel open-source electric stimulator that combines both function generation and electrical isolation. It has two electrically isolated output channels capable of generating up to +-3mA or +-15V pulses as short as 20 […]
Cheap Silicone Rubber Sealants
Labrigger has a terrific post about replacing the Kwik-Cast platinum-cure silicone elastomer ($106 for 5 mL) with Body Double Fast Set at ($30 for 400 ml). Depending on your dispensary needs, you might want to purchase a 400mL preloaded dispenser cartridge directly from smooth-on which goes with a dispenser gun for $70. Or buy a […]