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Thursday, November 15, 2018

BearFoot FX Honey Beest

This one just got traced over on FSB. Apparently the heaviest of Bjorn's Honey designs. Here's the schematic for reference. Note: In the schematic the source and drain on Q1-2 are reversed from the way they are normally oriented, but I recently learned JFETs are generally symmetrical and will work either way. The original is built on a PCB that several of Bjorn's circuits can be built with and is laid out for TO-18 package JFETs with a different pinout than the TO-92 packaged 2N5952. I'm wondering/guessing it was easier to swap the drain and source legs when fitting the transistor to the PCB, but perhaps other/earlier versions of the circuit used TO-18 JFETs and had the drain and source oriented the "normal" way. That's my reasoning and as a result I've reversed them to the "standard" orientation in this layout. Also I altered the polarity protection method to fit on the board better. I'll shut up now.


1 comment:

  1. Verified.

    I substituted 2.7k, 5.6k, and 15k resistors in place of the 2.6k, 5.67, and 14.7k, respectively. Q2's voltages were a little off from the schematic (keeping in mind the source/drain swap compared to the original), but my build sounds close to the demo.

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