This SPST & SPDT uses a CMOS 4066. It's a Quadruple Bilateral Analog Switch.
The SPST&SPDT behaves like a CV controlled switch.
There are just 2 switches:
Switch A on the front & switch B on the rear.
Switch A has the following connections (on the extreme right in the photo above):
<> 1CTRL: Toggle input
<> 1Anc: Normally connected
<> 1Bno: Normally open
<> 1AB:Pole/common connector
The "1CTRL" input is where you plug your modulation source (such as a LFO).
The pot on the right appears to modulate the 1CTRL input
Switch B on the rear has these connections:
<> 2CTRL: Toggle input
<> 2Bno: Normally open (multiple connection)
<> 2Bno: Normally open
<> 2Ano: Normally open
The "2CTRL" input is where you plug your modulation source (such as a LFO).
The pot on the left appears to modulate the 2CTRL input
2n3904 TRANNIE
tOP header
Testing the perspex guards.... the transistor needs to be bent down for everything to fit.
Example patch:
So you take a signal, eg video from the header and patch it to 1AB.
Then run G- to 1Anc and B- to 1Bno.
Now patch one of the LFOs (eg F01a) to 1CTRL. The knob on the right appears to set the point where switching occurs ...you should start seeing the video input jumping from B- to R- in time with the LFO.
The B side is similar, but it just connects two points On or off, instead of the A sides 'this or that'.
This (as the name implies) uses 6 push button switches.
Two single pole, double throw (SPDT) & four single pole , single single throw (SPST)
Looks like switches A & B are the SPDT.
Switches C,D,E,F are the SPST
These will turn on & off any extra connections you that you choose to make using the upper header patch bay.
aND the other side:
The upper header first;
Finished.
Such a simple build. Now to try some patches:
tHE switch system is really cool and easy.
The inputs and outputs of the SPDT switches (buttons A & B) are on the left of the module.
Connections for Switch A is on the front & for switch B on the back.
For switch A:
So you would connect any inputs to AP1 and outputs to AT1 & AT2
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The right side (front) has connections for the C & D switches.
That same side on the rear has connections for E & F. (FR,FT & EP,ET)
"The waveshape is similar to the 245 but the baseline sits at 4V,
not 2V (I believe) due to the number of stages. When all the
stage pulse output resistors were changed to 6K8, the module would no longer advance."
To fix this issue adjust the clock waveshape trimmers until it functions
reliably.
This is the waveshaper section on PCB2. Change R301to a 10K trimmer.
PCB2 Change R306 & R315 to a 20K trimmer (wiper at the node connecting R306 & R315).
Photo x 2 *
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Diodes
Looks like they are all standard 1N457
D1, D2, D3, D4, D5, D6, D7, D8, D9, D10
mouser 512-1N457
10K resistors first
1K resistors, etc etc
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100K trimmers
mouser 858-25PR100KLF
I used a different footprint one on TR2
still 100k
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Time to install the transistors
Don't install Q75, Q76, Q77, Q79.
These are 2N3906
Connect the base to the collector with a link on Q75, Q76, Q77, Q79.