Archive for the ‘Linear’ Category.

PRECIsion Power SUpply project

PreciPSU is an attempt to build high performance power supply. The idea started few years ago but it was never realised. Some major target performance specs are as follows:

  • three isolated channels
  • around 50W per channel
  • 24V/3A output per channel
  • lowest possible ripple at fastest response
  • small size
  • programmable via USB
  • nice housing with minimalist user interface (2 plugs per channel, knob, button and small display

Update 15.7.2017: block diagram

PreciPSU Block diagram

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12V Power supply

12V high current linear power supply is very useful for HAM applications. I designed one based on s53mv schematic. The circuit is somehow odd because regulation transistors are in negative side of the current loop. Main reason for that is the collector or source of the transistors, which is connected to the housing of the transistor. To avoid isolation of the transistors from the heat sink it is better to have the housing, heatsink  and the transistors connected to negative rail of the power supply. It is similar to the car, where negative pole is connected to the chassis.

pcb pcb1

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