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FrozenGate by Avery

"almost" free meter build






You can buy a similar circuit cheaply from laserbee, however these won't be very practical to build yourself.

Photodiodes are very limited in the power they can measure, I believe laserbee's only goes to 120mW.
As well, they are very wavelength dependent and are unable to measure shorter wavelengths such as 404.

Finally, you would need a second accurate power meter to calibrate it, which defeats the entire point.

Benm's diode thermal based power meter still wins for cheap DIY.
 
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