ReBach CATCH VCO-A DIY User manual

Date: 11-04-20 Project: Remark:
File: RBDIY-CTSVCOA-1 1 Version: 1 2
Title: CATCH VCO-A DIY HW version: 1 1
REF: Page: 1
- 1x Main PCBA RB1815
- 1x Front PCB RB1816
- 2x 10K Pot-meter
- 1x 50K Pot-meter
- 2x 10K trimmer
- 3x M7 Washer
- 3x M7 N t
- 6x 3.5mm Jack incl n t
Note:
Note:
Assembly instruction
Thank you for purchasing this ReBach DIY Voltage-controlled Oscillator !
We hope yo enjoy the constr ction and se of this bea tif l VCO.
Package Content:
- 3x Knob White
- 3x Knob cab
- 1x Ribbon power cable
- 2x 3mm screw
Check if all the above-mentioned parts are present in the packaging before starting constr ction! Contact
yo r s pplier if a part is missing before yo start b ilding.
Yo the c stomer agree that if the packaging has been opened and some constr ction steps have been
made, yo are responsible for a s ccessf l constr ction.
Follow the steps in this b ilding instr ctions caref lly to prevent errors
The conditions of yo r s pplier are respected by ReBach!
No rights can be ded cted from this doc ment.
© 2020 ReBach – www.rebach.e

Date: 11-04-20 Project: Remark:
File: RBDIY-CTSVCOA-1 1 Version: 1 2
Title: CATCH VCO-A DIY HW version: 1 1
REF: Page: 2
1Overview 2
Positions TR1 and TR2 on PCB. Front side PCB
3older 4
Position RV1=50k, RV2=10k, RV3=10k Back side PCB
Tip:
5Check Check 6
Note:
Assembly instruction
Place 10K trimmers on the PCB
All parts
Place pot-meters on the PCB
Check trimmer contacts in good position and solder
Place and solder
the trimmers first
before placing the
potentiometers
Check pot-meter 50K is on position RV1 (top) Check pot-meters 10K on position RV2 & RV3
No rights can be ded cted from this doc ment.
© 2020 ReBach – www.rebach.e

Date: 11-04-20 Project: Remark:
File: RBDIY-CTSVCOA-1 1 Version: 1 2
Title: CATCH VCO-A DIY HW version: 1 1
REF: Page: 3
7older 8
Check potentiometer contacts are in a good position and solder. PULS is in the middle of the top row
Tip:
9Check 10
Tighten the n t witho t changing the alignment
11 12
Place the spacers on the potentiometers.
Tip:
Note:
Assembly instruction
Place the PUL out jack socket
Solder one pin first
then whilst holding
reflow solder ntil
potentiometer sits
in place nicely.
Then solder rest of
the pins.
Tighten the jack socket
Align the jack socket as shown
Other Jack sockets pacer
Place the remaining jack sockets
Tighten the n ts hand-
tight so that the jack
sockets can move
slightly !
Do steps 8, 9, 10 before the other sockets are placed, otherwise it cannot be tightened
No rights can be ded cted from this doc ment.
© 2020 ReBach – www.rebach.e

Date: 11-04-20 Project: Remark:
File: RBDIY-CTSVCOA-1 1 Version: 1 2
Title: CATCH VCO-A DIY HW version: 1 1
REF: Page: 4
13 14
Tip:
15 Check Check 16
T rn over and check the solder tabs are completely thro gh the PCB
17 Nuts older tabs 18
Tip:
Note:
Assembly instruction
Place Front Place Front
Place the front and enter the Jack solder tabs thro gh the PCB Insert the solder pins thro gh the PCB
Adj st alignment of
the jack sockets if
needed so they can
enter tro gh the
PCB
Check whether the jack sockets f lly connect to the PCB
Place the n ts on the potentiometers and hand tighten them Shorten the long tabs with side c tters
Shorten the long
tabs before
soldering !
No rights can be ded cted from this doc ment.
© 2020 ReBach – www.rebach.e

Date: 11-04-20 Project: Remark:
File: RBDIY-CTSVCOA-1 1 Version: 1 2
Title: CATCH VCO-A DIY HW version: 1 1
REF: Page: 5
19 older 20
Tip:
21 22
23
Note:
Assembly instruction
Tighten Jacks
Solder the jack socket contacts Tighten the jacks with yo r wrench
Use a little fl x for a
perfect solder
connection (remove
fl x resid es with
fl x remover to
prevent damage to
the PCB !
Tighten Jacks Tighten Jacks
Tighten the jacks with yo r wrench Tighten the FM-IN jack with pointed pilers if wrench is too big
Tighten nuts
Tighten the pot meter n ts with a wrench
Step 19: make s re that no short circ it occo rs between the solder tabs by soldering
Step 20 to 23: Tighten the jacks and n ts with policy, not too tight to prevent damage
No rights can be ded cted from this doc ment.
© 2020 ReBach – www.rebach.e

Date: 11-04-20 Project: Remark:
File: RBDIY-CTSVCOA-1 1 Version: 1 2
Title: CATCH VCO-A DIY HW version: 1 1
REF: Page: 6
24 25
Tip:
26 Ready
Now advance to page 7 for t ning the VCO.
Note:
Assembly instruction
Place knobs Place knobs
Place knobs and caps Allow minimal space between knob and n t !
Align black line on
cap to the f lly left
position-line on the
front panel
No rights can be ded cted from this doc ment.
© 2020 ReBach – www.rebach.e

Date: 11-04-20 Project: Remark:
File: RBDIY-CTSVCOA-1 1 Version: 1 2
Title: CATCH VCO-A DIY HW version: 1 1
REF: Page: 7
Tuning
For good results, please let the VCO warm up for at least 5 minutes!
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Note: A
Note: B
Note: C
Note:
Assembly instruction
To calibrate this VCO, you need either a tuner or a different VCO or keyboard/ ynth. Your second
VCO or YNTH is used as the reference source!
Set the two trimmers (TR1 & TR2) in the middle position (ex works they are in the middle position)
Connect the VCO 1V / Oct inp t to a keyboard CV-note o tp t or Midi interface CV o tp t (1V / Oct o tp ts)
Connect a t ner to the TRI o tp t of the VCO (see note A)
Connect the power s pply ribbon cable to the VCO (make s re the red band is on the right hand side)
T rn on the power and let the VCO warm p for at least 5min (at normal room temperat re – plm 20C)
Set the TUNE knob on the VCO front approximately to the middle position and press C3 on the keyboard.
adj st the TUNE knob f rther ntil the VCO and yo r reference have the same freq ency (Low tracking
adj st. See also note B)
Press the keyboard C3 and meas re or listen to the freq ency. Then press C2 and C1, they m st exactly 1
or 2 oct lower. If the C2 and C1 have a lower freq ency then adj st TR1 slightly p (CW). are the C2 and
C1 higher than each other? Adj st TR1 slightly down (CCW). After every time yo adj sting TR1 yo have
to adj st the TUNE knob again so that yo are back at the same freq as the reference so rce !!
Press the keyboard C5 and meas re or listen to the freq ency. then press C4 and C3. if the C4 and C3
have a lower freq ency then adj st TR1 slightly p (CW). C4 and C3 are higher then adj st TR1 slightly
down (CCW). then check C2 and C1 again. After every time yo adj sting TR1 yo have to adj st the
TUNE knob again so that yo are back at the same freq as the reference so rce !!
Repeat step 7 as many times as necessary ntil all octaves are eq al.
Adj st the TUNE knob on the front 2 oct lower and repeat steps 6 and 7. if they are good go to step 10
Now adj st the TUNE knob on the front 4 oct higher and press C3 on the keyboard. Adj st the TUNE knob
f rther ntil the VCO and yo r reference have the same freq ency
(High tracking adj st. See also note C)
Press the keyboard C3 and then C2 and meas re or listen to the freq ency. Now press C5 and C6. C5 and
C6 have a lower freq ency adj st TR2 than slightly p (CW). If C5 and C6 have a higher freq ency, adj st
TR2 slightly down. After every time yo adj sting TR2 yo have to adj st the TUNE knob again so that yo
are back at the same freq as the reference so rce !!
Repeat step 12 as many times as necessary ntil all octaves are eq al and check C2 and C1 again !
If the low octaves are slightly o t of t ne after step 12, go thro gh step 7 again
If necessary, go thro gh all steps several times if the octaves contin e to have m t al differences
If yo do not have a t ner, connect a second VCO or SYNTH which receives the same CV-Note signal. Mix
the o tp t of both so that yo can hear and compare both signals at the same time ! If yo se a second
VCO, it m st be properly adj sted!
Low tracking adjustment takes place via TR1
High tracking adjustment takes place via TR2 This trimmer only affects high frequencies (approx C5 or
higher) At low frequencies, this trimmer will have no significant influence
No rights can be ded cted from this doc ment.
© 2020 ReBach – www.rebach.e