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small power supply using the tentlabs mec (mini electronic choke)

(guido tent with the help of menno vanderveen) created a series of electronic choke emulators, intended to replace big heavy filter chokes in power supplies for tube amplifiers.

I used one of the small ones, the MEC-100, in my 3B7 amplifier.  This part is rated at 100mA and emulates a 10H choke.  You can find full details about it on the Tentlabs website here.  It performs flawlessly as a filter choke in a capacitor-input filter for a B+ supply.

i also designed a small power supply pcb that uses the mec-series chokes:

it's quite small - 90mm x 50mm - but can generate a 100ma b+ supply for a preamp or smaller power amp.  here is the circuit:

You can also download a PDF file of the schematic here.  The PDF schematic also has details about what components to use and how to connect things.

you can configure the board to use a full-wave bridge using silicon rectifiers, or a full-wave ct, or a tube full-wave ct, or even a hybrid tube/silicon bridge.  it just depends on how you connect the inputs, and which rectifiers you install.  there are more detailed hookup instructions on the pdf schematic.

双色球模拟选号器here is a better look at the bare pcb:

you can buy the pcb and the mec-100 in .

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