This board is useful in Hi-Fi amplifier systems where a constant current sink is required. The 10M45S IC is capable of handling up to 450v, and a heatsink is definitely necessary. The 10M45S can be substituted for 'DN2540N5'. I am currently proposing to use it in my 6as7 Parallel Single Ended, Dual Mono Amplifiers; they will be placed on the cathode to ground, replacing the 1k/10W resistors.

Rset resistor value is calculated with this formula: Rset = 1.25/Iout. Iout being the current you wish to set.