This is in Eurorack format.
It's a reasonably big build so probably not good for a newbie.
Though it has all the major modules one would want so if you feel game go for it.
2 VCOs, 2 LFOs, 3 VCAs, 2 filters, 1 sequencer, 1 clock divider, 1 mixer, 1 S&H, 1delay, 1 headphone amp and a chaos generator.
Andrew's build notes are here:
http://www.sdiy.org/pinky/data/NULL%20A%20build&%20BOM.pdf
His blog notes are here:
http://nonlinearcircuits.blogspot.com.au/2017/03/null-a2.html
There are lots and lots of SMDs and 2 PCBs.
I've seen the golden goat.
These lyrics are from the band "The residents". From the album "Our Finest flowers"
I've seen the golden goat
He would like to lick my throat
I know he's mean and poor
And he waits at my door
He's too weak to do me harm
But he has a big long arm
It fills my dreamy head
Then I shake and wet my bed
Well, there's something I must tell you
I need something I will swear
The only perfect love
Is the one that isn't there
Yeah, the only perfect love
Is the one that isn't there
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More NLC wisdom.
Traditionally, in Aristotle's logical calculus view, there are only two possible values
(i.e., "true" and "false" or 0 & 1) for any proposition.
This is also known as Boolean Logic and is the basis of modern computers.
But in multi-valued logic, there are more than two truth values. For example, Łukasiewicz and Kleene accept the values "true", "false", and "unknown".
Fuzzy Logic is another example of a non-Aristotleian view of logic.
Here the truth values can be any real number between 0 and 1. It is employed to handle the concept of partial truth, where the truth value may range between completely true and completely false.
DPT = Dipropyltryptamine ?
N,N-Dipropyltryptamine (DPT, also known as "The Light") is a psychedelic drug belonging to the tryptamine family, first reported in 1973.
Back to the build:
First components. The 074 op-amps
...
Using 4 x LM13700MX/NOPB
Mouser NO: 926-LM13700MX/NOPB
The module uses one PT2399. Its a guitar aUDIO processor/delay chip.
Mouser doesn't stock these. So found some on ebay.
Look for SOP 16 size.
There are three CMOS chips.
4024,4029, 4052.
Mouser numbers:
595-CD4024BE
595-CD4029BM
595-CD4052BNSR
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)
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RL = resistor LED.
R176, R199, R217,261. These set the brightness of your LED. I'm using bipolar LEDs so picking 5k1 .... see how this goes..
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Q11,Q12 & Q29
I used a MMBFJ108 replacement.
Mouser no. 771-PMBFJ108-T/R
1K Tempcos.
Right side of main PCB
Centre of main PCB
Left of main PCB
Installing headers.
Lots and lots of jacks n' pots
A NSL vactrol. cheap as chips. K = cathode = white dot on the vactrol.
Couldn't find a SMD 10M resistor. So a through hole had to do.
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DPT = Dipropyltryptamine ?
ReplyDeleteYes Possibly.... thanks I'll add it to the notes.
ReplyDeleteCheers Jono
Should the pots be audio or linear taper?
ReplyDeleteI used all B100K pots. The 1M are audio
Delete