Here are Andrew's build notes:
http://www.sdiy.org/pinky/data/mixseq1050BuildBOM%20vers1.pdf
Muffs notes:
https://www.muffwiggler.com/forum/viewtopic.php?t=154469
Some pics of the virgin PCB & Panel
I like to get those ICs on first. These are SOIC.
The sequencer section uses one CD 4017 (decade counter) , three CD4071s (quad 2-input OR gate) and one CD 4081 (CMOS Quad 2-input AND gate).
A bit about gates.
CD4071 (quad 2-input OR gate)
CD 4081 (CMOS Quad 2-input AND gate).
..
This is the truth table for the AND gate
Here are the mouser details.
You can also use a DG 442. Just make sure it can handle +/-12V.
My DG 212 can handle +/-15V so should be OK.
It's an analogue switch. 4x SPST.
Some earlier versions of the DG442 require a voltage offset on pin12, the spaces for these resistors are on the PCB marked 100k* and 120k*.
New versions do not require these resistors, so check the datasheet for your IC, if pin 12 is marked ‘NC’ you do not have to install these resistors.
My DG 212 has pin 12 marked as VL. so I will install the resistors.
Data sheet.
Next install the rest of the SMDs.... lots of resistors & caps. These are 0805s
Parts marked "c" are 100K .
Then the through hole stuff.
Install jacks, switches first. Line up with panel.
Don't forget the ground wires for the jacks. I use left overs from caps & resistors.
The PCB looks like this:
Finally the LEDs
LED orientation : The long lead (anode) , (+) goes into the square hole on PCB.
Yah it works. Nice one Andrew.
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