Aion Draco (Dr Boogie) JFET Bias

[faramir]

Built an Aion Draco Dr Boogie clone. Only issue I ran into was biasing the 4th J201. I could only get it to 5.8v with the trimmer turned all the way up. The others all could easily get 4.5v. Any ideas on why this might be? My guess is a bad J201, possibly damaged by me during install? I used a soldering iron at 700 deg F and they are SMD's installed straight to the board by me. I got them from Stomp Box Parts. Not sure how easy they are to damage or how they would behave if I did.

Despite this it actually sounds pretty good though its a bit staticky-fizzy sounding at some settings. Hoping fixing that bias issue will help. Definitely sounds better at 18V (I did the bias at 9).

 

[johnk_10]

@johnk_10 does things a little differently, and it really makes me want to add wire stress reliefs to the boards.

for me, it makes it a lot easier for testing before mounting it in an enclosure

 

[johnk_10]

Since I haven't diagnosed the very low output problem with my Boogie Monster yet, I decided to build up an etched pcb version that I created a couple of years ago and it works properly. I'm still going to try to get my Pedalpcb version working by using a tone generator and a scope to find out where it's losing 99% of its output level.