Light-2-Voltage Converter (L2V)

The three L2V Converters, provided by Professor Veikko Jousmaki, use a TSL250R light-to-voltage optical sensor, running off a 9V battery.

"L2V1" and "L2V3" are connected to MISC4 and MISC5.

If the red LED is lit when switched on, the L2Vs are presumed to be working as intended.

The L2V Converter boxes are situated in the Stimulus Cabinet, and the BNC connections exit via the filter panel then under the floor to the MISC interface box on the desk.

"...There is a 5V low-drop voltage regulator inside the L2V transformer box. Thus ~5.3V is still enough for keeping a stable 5V. The power consumption is less than 1 mA and thus one 9V battery ranked at ~600 mAh will last for several hundreds of hours.... until the battery runs below 5 volts. The LED may still work but the output of the L2V will change to show lower voltages. Finally, the battery will not drive the regulator anymore and the output will be whatever between no output to some output without any calibration...."

Battery change (9V):

• 13th April 2026