GUMA-Antique

PCB-assembly 1/3

First we start with the bare pcb:

There can be some ridges on the pcb. We need remove them before assembly.

GUMA-Antique_Bausatz_009

GUMA-Antique_Bausatz_010On the picture above you see the first step for soldering the JFETs (MMBF-J201). One pad per JFET gets coated with solder. Now you take a JFET with tweezers and place and fix it on the corresponding place. Heat up the pad (you coated before) and pin (of the JFET) to get a joint.

ATTENTION: JETs are very sensitive for heat and ESD. This step is the most crucial step in the whole instruction. Take care and take your time.

The other pins of the JFETs can be soldered normally (heat up the pad, put solder to it, done).