Filament supply

Ultra Low Noise DIYHFS current source filament supply. 2.5A, 2.5v-12vdc output (depending on heatsinking)

Output noise ~4mv (typical 300b filament, varies by current draw). Input/Output short circuit protected, overheat protected, output voltage continuously variable with on-board trimmer pot. Through-pcb vent-holes for cooling of critical parts. Also, can be mounted flat profile without heatsink by mounting regulator from the bottom and bolting regulator direct to chassis. Includes mounting standoffs and 4 pcs 0.47r resistors to trim input voltage. Function indicator LED on board. Best quality parts: Nichicon, Schottky etc


Application notes (pdf)


Basically the circuit design and the device chosen allows it to function as a VCS. By adding/subtracting some parts the pcb (see application note) can also be configured as a pure CS or VS, if desired. As supplied it functions as a VCS.