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:
http://www.sdiy.org/pinky/data/cellF%20action%20BOM%20&%20build.pdf

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
https://www.njr.com/semicon/PDF/NJM13600_NJM13700_E.pdf
They are current controlled transconductance amplifiers.
I'm using the same components I used on the cluster build


ICs:
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."
(Wikipedia)
 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.


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Having trouble sourcing the TLP291-4 - quad opto-coupler package. ?? Mouser no
I'm trying these:
https://au.rs-online.com/web/p/optocouplers/6936807/

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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.





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

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