CCS PCB Ready

I received the first batch of PCBs after several tweaks during the prototype phase. I’m very pleased with the result:

I built several boards to test the various combinations that this flexible CCS board offers:

• Top MOSFET (DN2540/IXTP08N100D) mounted close to the edge to allow the CCS to be bolted to a big heatsink. Alternative a small heatsink over the TO-220 can be used for 1-2W dissipation.
• The lower device can be multiple options depending on the target use
  • High bandwidth and low noise CCS for phono stages (up to 20mA):  
    • 2SK170 (TO-92) 
    • BF862 (SMD)
    • Alternatives to BF862 due to EOL: 2SK3557 and CPH3910
  • High bandwidth and general CCS use with jFETs:
    • J310 (<60mA) – TO-92
    • J112 (<20mA) – TO-92
  • Protection zener for low voltage devices (jFETs)
  • High-current CCS
    • DN2540 (<120mA) – TO-92
    • DN2540 (<170mA) – SOT-89 (mounted on reverse PCB side)
    • DN2540 (<500mA) – TO-220
    • BSP129 (<250mA) – SOT-223 (mounted on reverse PCB side)
    • BSP149 (<660mA) -SOT-223 (mounted on reverse PCB side)
  • Gate stoppers can be either through-hole or SMD (mounted on reverse PCB side)
  • Mu-follower output for low output impedance configuration
  • Current measurement resistor: 1 or 10Ω
  • Current setting arrangement:
    • Fixed resistor
    • Multi-turn trimpot and series resistor (optional)

Below is the diagram of the CCS board:

This is an universal cascoded FET CCS which has been used extensively in audio. It can be used for anode loads (phono, drivers), parafeed output stages, tail CCS, LTP stages, bias supplies arrangements, VR valve supplies regulation, etc.

Still need to do all the documentation, but if you are interested you can send me a request here: