LogLED 311
A small universal power-LED driver for multiple purposes
Description
The true LogLED worthy its name
Unlike most modern drivers based on pulsed operation, LogLED 311 uses a triple parallel resistor-circuit with a 20 MHz micro-controller to drive the LED. It delivers a flicker-free experience in all brightness levels and reacts linearly to changes in the input-power voltage, and reacts within tens of microseconds.
Moreover, 311 covers a massive brightness range from blinding-bright to barely visible. Smoothly, without any visible steps.
Our LogLED drivers use PapaLink for power and data meaning 311 can be powered from a wide range of DC power supplies (8-14 V, ideal 12V) including linear and switching supplies and batteries. Standard ttabletop switched-mode power supplies are 12V 5A or 10A models.
You can control the 311 driver from your PC, single-board computer or from any another micro-controller that supports the I2C communication protocol. You can create flashes, pulses, steps, ramps, sinusoidals, waves, sweeps, noise patterns, pretty much anything. The dual BNC ports can be used for analog input, hardware trigger or digital output.
311 is fully open-source. Its micro-controller can be updated and modified by the user (requires a micro-USB to USB cable and a PC) to generate custom light patterns on-chip for really fast operation. On-chip models and processing can be also used for compensating component tolerances and LED-junction temperatures.
Key Features
- Light and portable
- Uses our R30 LED elements that have economical pricing
- Massive dynamic range | Bright
- Fast switching (up to tens of microseconds)
- PapaLink for power and control
- BNC to interface with other lab gear (5 V TTL)
- Open-source | User modifiable
Example Applications
- Light source for IR+VIS+UV stimulation
- Illumination for cameras and microscopes
- Industry automation | Spectral imaging
- Research use in neurosciences, optogenetics
- Applications in photobiology, photochemistry and photophysics
Safety information
- Never directly view the R30 LED near the max-power. Especially the IR and UV may appear dim to the eye but can cause serious harm or blindness.
- Prolonged +10 s use near the max-power may overheat the R30 emitter leading to its failure or making it too hot to touch. Do not leave the device unattended when near the max-power.
- Caution on extreme ambient conditions: At high temperatures above 35°C the device's cooling capacity is lowered and prolonged max-power use may overheat internal components. High humidity over 90% may causes condensation causing several issues such as corrosion and short-circuiting.
Technical Data
| Driver type | Resistive with 3x 11-bit circuit |
| Micro-controller | Arduino Nano Every (20 MHz) |
| Firmware | PapaLink AVR Device LogLED |
| LED connector | R30 |
| Power and data connector | PapaLink (standard socket) |
| A/B connector | BNC (50 Ohm) for 5V TTL |
| Input voltage | 12 V (from 7 V to 14 V) |
| Max current draw | 2 A |
| Color | Black |
| Material | 3D-printed PETG |
| Dimensions | 157 mm x 110 mm x 66 mm (with the M5 leg) |
| Weight | 370 g |
| Dimmest flickerless ON values from max brightness | |
|---|---|
| Absolute | 0.00002% (6.7 log10 units) |
| Smooth-3%-range | 0.0008% (5.1 log10 units) |
| Recommended ambient conditions | |
| Temperature | -20°C to +40°C |
| Humidity | 20% to 80% |