Showing posts with label DIY. Show all posts
Showing posts with label DIY. Show all posts

Thursday, 6 June 2019

Metromodular buchla power supply - Todliche - build pics

These are my unofficial build pics for the metromodular buchla format power supply.

This PSU is installed in the Todliche Finger - Model 601
The psu can output 667mA on each of the +15 and -15 rails, and 1.5 A on the +5V rail, which should be enough for a 5-panel system.


 I don't have a BOM but if you buy the PCB, all the components are marked.

The name (Todliche) is a reference to the power supply board's edge connector “fingers”.


Its a very easy build
I'm sure Justin will be adding build notes to his website soon, if they haven't already been added.
















Some Links
+ Metromodular Facebook
+ Metromodular Youtube
+ Metromodular website  

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My Metromodular index page
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Portabellabz VCS3 Card for 208

These are some pics taken during my build of the Portabellabz synthi/vcs3 card/
Its designed to be an expander for the Buchla 208 / Music Easel.
These are un-official notes and I'm not affiliated with Portabellabz.

The Official website is here:
+ http://www.portabellabz.be/vcs3.html 
+ Official Manual
+ Official Build notes
+ Muffs build thread

Resistors, IC sockets, Voltage regulators etc

Trim pots and caps.
The order of placement of my components isn't ideal. It was dictated by the components I had at hand and more were added as components arrived.

The rear so far.

More pots arrived :-)


This 2n5172 trannie is for the noise. Cut off the centre leg.
You need a to order a few of these so you can select the best one for the noise. (see build notes).

Some close ups .. esp of that 2n2916 and the 1K TC resistor



initial panel wiring

The noise transistor

There is one standoff missing .... between the freq and sync inputs.


Monday, 3 June 2019

Metro Modular 2196 - Dual Phase Shifter - Build notes

These are unofficial build pics and notes for the Metro Modular phase shifter.
Please check this with the official notes when they come out.

There are two inputs.
Each takes one audio signal (above 1.7Hz) and outputs two signals that are out of phase with one another.
You could use it in conjunction with a ring modulator to get some frequency shifting.
A quadrature signal would also be useful for driving the Boethian Wheel - Model 660

The module is in 4U Buchla format.

I'll be updating this as I proceed with the build.
The MM2196 goes by the name "Roselands" which is a Sydney suburb with the same postcode.


There are 2 identical PCBs for each module. So you need to double the BOM
The BOM for each board is:
(Please check this with the official notes when they come out.)

Resistors:
10R x 1
100R x2
220R x 2
680R x 2
1.5k x 2
3.57K x 18
10k x 2
15k x 1
22k x 4
68K x 1
82K x 1
100K x4
150K x 2
25K trimmers x 4

Capacitors
220pf - ceramic x 1
470pf - ceramic x 2
4n7 - polyester x 2
47n - polyester x 2
470n - polyester x 2
100uF - electro 16V x4
1uF - electro 16v x 1

Transistors
+ 11 x Mouser No: 512-BC560CTA
BJT TO-92 PNP 
+ 11 x Mouser No: 512-BC550CBU
BJT NPN

Misc
Tiny Jacks x 11


Ps where it says 3k57 for the resistors, 3k6 are fine.
Stick with 1% for resistors on most things in this build. 


470pf and 220pf are ok as C0G (single layer ceramic) or NP0 (ultrastable or temperature compensating capacitor) ceramics, make the others polyester.
The electros can be 16V

These are the trimpots I'm using.





Standard Buchla connector to the front-Only need the +15 and Q lines.


 The transistors that I'm using are:
 bc560

bc550






Way to assemble is to put one board (with power connector) on, screw it in place between the spacers, wire it up and calibrate. The three pins (SV1) behind the power connector can be used for a 3-pin header pin/socket pair that you then solder onto the next board stacked above. Screw it in, wire it up and calibrate. You’re done.

Calibration frequencies. (Left to right) use 10hz, 100hz, 1khz and 10khz sine waves.






Some Links
+ Metromodular Facebook
+ Metromodular Youtube
+ Metromodular website   

+ MM2196 "Roselands" Dual Phase Shifter
+ Comparing the Buchla 196 to the 185 (phase vs frequency shifting) 
+ All about Transistors
 

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My Metromodular Index Page
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Friday, 24 May 2019

Metro-Modular 2102 - Dual Stereo Locator - build notes

These are some un-official build notes for the Metro Modular 2102 module.
It's in Buchla format.
For more info on this module click here:
 https://djjondent.blogspot.com/2019/05/metro-modular-dual-stereo-locator-model.html

The official build notes will be released later.

The virgin PCB and panel

In addition to the main circuit, Justin has added an extra scaler & a JFET tester/matcher circuit at the top of the PCB.
i STARTED building the input  scalers section on the top left of the PCB then realised I didn't need it as I was going to install it into my Buchla 100 system.
The whole input scaler section is only needed if you use the module with 10V function generators.
Vintage black knob 100 Buchla is 15V.

I usually start with resistors then add caps.
The resistors I'm using are metal 1%.




 Get some 15mm hex standoffs ... female/female.
Yes I agree with Jim. West is Best !

You can also buy a C&K equivalent from Mouser.
You will need to trim the shaft. I'll probably use shears rather than a hacksaw so I don't get grit in the mechanism. yOU ALSO NEED TO RETURN THE SWITCH TO POSITION 1 AND SET THE STOP PIN TO 2.


I'll probably end up soldering the JFETS directly to the PCB, though I have added a socket for the tester.
The JFET matcher is dead easy.
Simply stick the JFET in. and put multimeter probes on the two test points.
Read the voltage.
The voltage should be between 0.7V and 1.2V
The voltage corresponds to the saturation voltage of the JFET
The JFET can be put in back to front (in the test socket only)
The 1k resistor used in this tester must be 1%.


Choosing the JFETs
 If you are unfamiliar with JFETS check this link out.
 https://djjondent.blogspot.com/2019/05/transistor-families.html

J201s might work, though you will probably need to go through a few to find enough within the correct range.
The bottom two could possibly be PN3819 or J202 ??
2N4339's from mouser are pricey. There is a long waiting period for the PN4339.
How you mount them will depend on the format.
If they are in a T0-92 package  they need to be mounted "backwards" .... with centre leg pushed forward..... ie the flat edge of the JFET body faces away from the front..
.....



I ended up buying some tin can 2n4339s on ebay.
Not sure if these are fake ... :-)

 These are in a TO-18 package



The input scaler section

This is only needed if you use the module with 10V function generators.
If you are using it with 15V peak black-knob 200 or 100 gear you can ignore it.

If your power supply has +24V just connect the 24V to the rightmost pin of the regulator socket.











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Metro-Modular  are from Sydney Australia. 
The new modules being released for SuperBooth 19 are:

 1.  The Boethian Wheel - Model 660
 2.  Dual Stereo Locator - Model 2102
 3.  Roomic Cube - Model 680
 4.  Dual Balanced Modulator - Model 2315
 5.  Todliche Finger - Model 601

Links:
+ All about transistors & JFETS
+ Transistor Matching
+ JFETS - matching for synthesizers  

Some Links
+ Metromodular Facebook
+ Metromodular Youtube
+ Metromodular website  

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My Metromodular Index Page
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