TubeOhm De-Generator User manual

De-Generator
DIY sample Synthesizer
Building instruction 3, the filterboard
V 1.04 english
Date 08.04.2019
www.t beohm.com

Hello, now we come to the third b ilding instr ction. In this man al we will assemble the
-stereo m ltimode filter.
As always, take a look at the board first – and Hoooommmmm -, the only thing yo have to
watch o t for is that the three connectors K1,2,3,4 come down.
Tip: the resistors sho ld always be meas red with a m ltimeter before soldering.
People who want to so rce parts by themselves - Attention both IC's 4052 m st be
C-Mos IC's are. These work with a higher operating voltage of 8 Volt!
first we will solder in the coils/resistors, then the capacitors, then the IC sockets and finally
the transistors and potentiometers.
Everything ready ?
Here is first of all the layo t .

We now solder the following components :
2 Ba teile/2 parts
L1,L2 Coil 10 F 2x
Can be that the biger or
smaller one is in the kit
2x10 H coil 320 mA
8 Bauteile /8 parts 220R Position val e
Red,red,black,black,brown
Metall film resistor 8x220R
R1,R31,R32,R35,R41,R44,
R47,R50

6 Ba teile / 6 parts 1k Position val e
Brown,black,black,brown,brown
Metall film resistor 6x1K=
R11,R18 R17,R53,R54,R62
3 Bauteile /3 parts 2,2K Position val e
Red,red,black,brown,brown
Metall film resistor 3x2,2K
R20,R24,R56

3 Bauteile / 3 parts 4,7K Position val e
Yellow,p rple,black,brown,brown
Metall film resistor 3x4,7K
R72,R73,R75
1 Bauteile / 1 parts 5,6K Position val e
Green,bl e,black,brown,brown
Metall film resistor 1x5,6K
R21

23 Bauteile / 23 parts 4,7K Position val e
Brown,black,black,red,brown
Metall film resistor 23x10K
R16,R19,R27,R28,R29,R30,R34,
R36,R38,R39,R40,R42,R43,R45,
R46,R48,R49,R51,R52,R55,R70,
R71,R74

6 Ba teile / 6 parts
Red,red,black,red,brown
Metall film resistor 2x22k
R77,R79
Red,yellow,white,red,brown
Metall film resistor 2x24,9K
R5,R65
Orange,orange,black,red,brown
Metall film resistor 2x33K
R22,R57
22k position 24,9K position 33K position

10 Ba teile / 10 parts
Yellow,p rple,black,red,brown
Metall film resistor 4x47K
R13,R14,R25,R26
yellow,white,white,red,brown
Metall film resistor 6x49,9K
R3,R7,R9,R68,R61,R66
47K position 49,9K position

8 Ba teile / 8 parts
Bl e,gray,black,red,brown
Metall film resistor 2x68k
R6,R15
Gray,red,black,red,brown
Metall film resistor 2x82K
R4,R64
Brown,black,black,orange,brown
Metall film resistor 4x100K
R8,R10,R67,R69
68K position 82K position 100K position

6 Ba teile / 6 parts
Brown,red,black,orange,brown
Metall film resistor 2x120k
R37,R60
Red, p rple,black,orange,brown
Metall film resistor 2x270K
R23,59
Green,brown,black,orange,brown
Metall film resistor 2x510K
R12,R63
120K position 270K position 510K position
Now we have solder all resistors into the PCB .
The PCB sho ld look like this:

Now we're going to solder in the capacitors.
8 Ba teile / 8 parts
10pF marked [10] or 10pF
Ceramic cap RM2,5 2x10pF
C2,C6
100pF marked [101]
Ceramic cap RM2,5 4x100pF
C1,C4,C23,C29
220pF marked [221]
Ceramic cap RM2,5 2x220pF
C8,C10
2x 10 pF
4x100pF 2x220pF

28 Ba teile /28 parts
100nF marked [104]
Ceramic cap RM2,5 28x100nF
C5,C7,C9,C14,C16,C18,C19,C24,
C26,C28,C30,C31,C33,C35,C36,
C38,C39,C40,C41,C42,C43,C44,
C49,C50,C51,C52,C53,C54
220nF marked [224]
Ceramic cap RM2,5 4x220nF
C13,C17,C22,C32
28x100nF marked [104] 4x220nF marked [224]
Before we solder the remaining capacitors it is easier to solder the IC sockets first.
We need:
1x8 pin IC socket
4x14 pin IC socket
7x16 pin IC socket

the 8 PIN IC socket is marked bl e and is installed so that the notch points to the left .
the 14 PIN IC socket is marked green and is installed so that the notch points to the left.
the 16 PIN IC socket is marked red and is installed so that the notch points to the left.

Now the remaining capacitors are soldered.
14 Ba teile/ 14 parts
1nF marked 0,001
Wima cap RM2,5 8x1nF
C11,C12,C15,C20,C25,
C27,C3,C37
10 F Elko polarized
Mini 10 F Elko
attention polarized , min s is
the short leg
2x10 F elko
C47,C48
4,7 F non polarized
4,7 F NP (non polarized)
Elko
4x4,7 F NP
C21,C34,C55,C56
8x1nF Wima RM2,5 2x10 F polarized 4x4,7 F NP

Finally, the semicond ctors, trimming potentiometers and connectors are soldered.
8 Ba teile/ 8 parts
2N3906 Transistor PNP Transistor
5x2N3906
T7,T8,T4,T5,T6
2N3904 Transistor NPN Transistor
3x2N3904
T1,T2,T3
5x2N3906 3x2N3904

The trimmer
7 Ba teile/ 7 parts
2x Trimmer 20 K
Trimmer 20K
Marked Z 203
2x20k trimmpot
R58,R76
1x trimmer 50 K
Trimmer 50K
Marked Z 503
1x50K trimm pot
R33
Here the 3 pots
left 20K , middle 50 K , right
20k
The header
3 Ba teile / 3 parts
1x (2x10)PIN header
Position K1
Attention this header is
soldered from top and goes
to the backside
1x (2x10)pin header
K1
3x (2x4)pin header
Position K2,K3,K4
K2 is a dio o r , K3,4 is
gro nd
Attention this header are
soldered from top to the
backside
3x (2x4)Pin header
K2= a dio o t
K3,K4= gro nd

Now it sho ld look like this
From the top
and from below *** the circ it board is cleaned

Meas ring points.
We work with the following operating voltages / potentials.
-8 Volt
+8 Volt
GND
Attention, the 4052 switch m st be a C-MOS type !!!
red = (pl s) 8Volt >>> 7,5...8,5 is OK
green = (min s)-8Volt >>> -7,5...8,2 is OK
is meas red against gro nd /GND .
The filterboard is pl gged onto the motherboard. Please make s re that the connectors
are pl gged in correctly. The CPU Board/Pannel Board sho ld not be pl gged into the
motherboard.
After the motherboard has been switched on, the voltages on the filter board sho ld be
checked.
Now the filterboard is soldered and voltage checked.
Before yo pl g in the IC's yo sho ld clean the board. After that please check all solder
joints again and best with a magnifying glass. People, I still find one or the other solder
joint with which I am not satisfied yet and solder it again.

It's better to invest another 15 min tes in checks than to spend ho rs searching for
mistakes afterwards.
Attention, the 5051 and 52 are C-Mos IC'S and very sensitive to static charging.
Now the IC's can be pl gged in.
As yo can see, the markings of all IC's point in one direction. Please check twice if all IC's
are a:) in the right direction, and b:) in the right place.
The Adjustment
For the adj stment of the complete electronics, please refer to the 'ADJUSTMENT
Man al'.
So m ch in advance. The filter installed in the de-generator is a stereo filter!
That means that each filter m st be adj sted individ ally in V/OKT and then again among
each other ! So nds complicated , b t it is not .
Yo see three trimmers.
Lin 1 sets the linearity of filter 1 in V/OKT.
Lin 2 adj sts the linearity of filter 2 in V/OKT
If both filters are set, the lower c toff freq ency of both filters is set to the same freq ency
via BALance - and that's it.
A detailed instr ction for adj sting the filter can be fo nd in the 'Adj stment Man al'!
Congrat lations - the filter board is now ready.

A few words . There are some 100 parts and a lot to write - in all man als. In order to
avoid mistakes, the boards were b ilt p parallel to all man als and checked for f nction
afterwards.
We hope that this man al is nearly error free - b t if yo sho ld find any errors ( wrong
part name or misleading terms ) please let s know abo t these errors. We will change the
man al immediately.
Andre'
T beOhm
Website:www.t beohm.com
Mail : Kontakt@T beOhm.com
Phone international :0049 236857164
Phone national : 0236857164