Thursday, 30 November 2017

CellF Action - Build notes

Finally getting around to this.
Andrew put these out in 2015 (along with the CellF Voice).
Andrew's build notes are here:

A big-ish build I think.

Some closeups of the PCB to help with later troubleshooting.
Right of PCB

Centre PCB

Left PCB

The Action panel uses three NJM13700
They are current controlled transconductance amplifiers.
I'm using the same components I used on the cluster build

I'm using sizes SOIC-14/16, SOP-16
SOIC = Small Outline IC
SOP = Small Outline Package 

"A Small Outline Integrated Circuit (SOIC) is a surface-mounted integrated circuit (IC) package which occupies an area about 30 to 50 % less than an equivalent dual in-line package (DIP), with a typical thickness that is 70 % less. They are generally available in the same pin-outs as their counterpart DIP ICs. The convention for naming the package is SOIC or SO followed by the number of pins. For example, a 14-pin 4011 would be housed in an SOIC-14 or SO-14 package."
 There are 5 fixes needed to the slew of the logic module.

 I added the 47K resistor to the underside of the PCB

gETTING there. Just waiting on some components from Mouser.
This is a big build.
ICs and most of the SMD passives are in.


Having trouble sourcing the TLP291-4 - quad opto-coupler package. ?? Mouser no
I'm trying these:

LED resistors.
I'm using 1.5K resistors for the RL components.
Andrew's build notes for the Cell F Voice panel said:
For regular LEDs use RL = 330Ω-470Ω
forultra/superbrights use RL = 4k7Ω-10kΩ

I may have to change this once I get the board up and running.
Easy enough to do with SMD .


Time for the pots and jacks
 Notice the height of the jacks. The switch is taller than usual and this is forcing me to raise the level of the jacks & pots.
 Soldering the pots was a tad tricky. 

You will need 4 of these JFETs

These are the 1K tempcos draped over transistors in QUO and VCO sections

fINAL pics.

+ NLC Build notes for Cell F Action panel
+ Build notes for Cell F voice

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