Close

R&D notes

A project log for Why I built an LED luminosity tuner

It's annoying to guess at the brightness of an indicator when calculating for an LED.

charlie-kimCharlie Kim 05/13/2026 at 20:020 Comments

5/13/26 
1. Experimenting with log amplifier so that the lower current gets more throw since the human eyes see logarithmically, this is challenging as adding a diode to the feedback limits the dimming range, I will have to possibly drive a BJT and add a subcircuit that provides delta R to the feedback.  This will take some thought and experimentation. 

2. Some of the feedback from a design review on LinkedIn has brought up the topic of adding easy SMD support.  There are several features I would like to implement when this is done

  a. kelvin connection

  b. A method of providing hands free clips so that 0603 SMD LEDs can be measured in place for LEDs under a control panel and or diffusers. 

NOTE:  this can be achieved by soldering wires to the LED and attaching to the eeZ LED as it is currently designed.  However without kelvin connectors, the measurements are slightly off due to the voltage drop on the wire leads.   Analysis and assessment needed to understand the effect on variance and significance.

Discussions