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Synthesis Technology MOTM-110 Ring Mod & VCA, Assembly Instructions Manual

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Synthesis Technology MOTM-110 Ring Mod & VCA Assembly Instructions Manual Download Page 3

SYNTHESIS TECHNOLOGY 

 

PAGE 

3

 

MOTM-110 ASSEMBLY 
WWW.SYNTHTECH.COM

 

PAGE 2    MOTM-110 PARTS LIST 

 
 
 

 

Pots

, containing the following: 

 
 

4ea 100K linear, Spectrol 148 

 

 

VR2 - 5 

 

1ea 100K linear, Bourns 91 (panel mount)  

VR1 

 

 

Front panel

 

 

 

Mounting bracket

 

 

 

Wire

 bag, containing the following 9 wires: 

 
 

5ea RG-174 coax, 4 1/2 inches 

 

2ea red/black twisted pair 

 

1ea orange/white twisted pair 

 

1ea blue 24ga. wire 

 

 

Hardware

 bag, containing: 

 
 

4ea #8-32 x 3/8 black screws (for mounting module to rack) 

 

4ea #6-32 x 1/2 zinc screws (for attaching pc board to bracket) 

 

4ea ¼ inch aluminum spacers 

 

6ea #6 KEPS nuts (2 for attaching bracket to front panel, 4 for pc board) 

 

3ea small heatshrink tubing 

 

5ea small tie-wraps 

 

 

Organic Solder 

 

 

 

No-clean Solder

 

 

 

PC Board

, MOTM-110 

 

 

Power cable 

 
 
 
 
 

 

 

 

 
 
 
 

 

Summary of Contents for MOTM-110 Ring Mod & VCA

Page 1: ...MOTM 110 Ring Mod VCA Assembly Instructions Synthesis Technology 6625 Quail Ridge Dr Fort Worth TX 76180 888 818 MOTM www synthtech com June 3 1999...

Page 2: ...a 100K 5 brown black yellow R8 R9 R11 R13 R14 R16 5ea 1K 5 brown black red R3 R12 R21 R23 R24 3ea 56K 5 green blue orange R1 R4 R27 2ea 150K 1 brown green black orange R2 R7 2ea 470K 5 yellow violet y...

Page 3: ...9 wires 5ea RG 174 coax 4 1 2 inches 2ea red black twisted pair 1ea orange white twisted pair 1ea blue 24ga wire Hardware bag containing 4ea 8 32 x 3 8 black screws for mounting module to rack 4ea 6...

Page 4: ...ration Can calibrate by ear Heat gun for heat shrink tubing optional but HIGHLY recommended For more information of tools used and suggestions see the MOTM FAQ at www synthtech com HOW TO FOLLOW THE D...

Page 5: ...a copy larger than actual size of the silkscreen which shows where the parts go at the end of this document It will be useful if you locate the part on the print first put the part in the board then c...

Page 6: ...Verify all the resistors are flat on the board Correct if needed Wash the board in warm water gently scrubbing both sides Shake the board a couple of time blot dry with an old towel the leads will fra...

Page 7: ...SYNTHESIS TECHNOLOGY PAGE 7 MOTM 110 ASSEMBLY WWW SYNTHTECH COM Locate the 0 47mfd yellow box caps They are stamped 474 Solder into C6 C7 C8...

Page 8: ...TA 156 power connector Solder into JP1 Note that the connector has a locking tab on one side This side is the inside facing relative to the pc board Note the silkscreen symbol for JP1 has a line on on...

Page 9: ...cate one of the red black twisted pairs Solder the RED short end into S1 into the top hole round Solder the BLACK short end into S1 bottom hole square Solder the other red black twisted pair as before...

Page 10: ...Keep the lockwasher on the jacks Insert the 6 jacks lockwashers with the beveled corner in the upper right corner into the 6 holes Place the flat washer on the jack then the hex nut Hold the jack with...

Page 11: ...ATTENTION AND READ ALL OF IT BEFORE PROCEEDING Note that each of the 4 pots on the pc board have 2 hex nuts and a flat washer Remove the first hex nut and the washer Set aside What you will do now is...

Page 12: ...SYNTHESIS TECHNOLOGY PAGE 12 MOTM 110 ASSEMBLY WWW SYNTHTECH COM For each pot place the flat washer on the threads then the hex nut Tighten...

Page 13: ...one the switched lug is the top one NOTE on the MOTM 110 NONE of the switched lugs are used You should not have any wires connected to the top lugs First strip about of an inch off one end of the wire...

Page 14: ...the socket Place Pin 1 in the lower right socket pin the part faces downwards like the other chips Be sure the chip is all the way seated and no pins are bent Note that the notch on the chip matches t...

Page 15: ...1 2 Khz Turn the amp on Now adjust the X TRIM trimmer for the lowest volume signal Turn amp off Place the signal in the Y IN jack Turn the X IN pot to 0 Turn the Y IN pot to 10 Turn the amp on Now ad...

Page 16: ...S TECHNOLOGY PAGE 16 MOTM 110 ASSEMBLY WWW SYNTHTECH COM Turn the X IN pot to 2 With a DVM or scope look at right side of R8 square pad and Ground Adjust the X IN pot until you read 5 0 volts or close...

Page 17: ...a Y cord is handy Set the switches to AC the UNBAL to 0 and the X IN and Y IN pots to 7 You should be able to hear see that the RING MOD out is frequency doubled version of the input Turning the UNBAL...

Page 18: ...R10 The output of the circuit is X Y 5 This is due to the 2 input stages U3A and U2B being an inverting summer The X and Y input stages are identical except the Y input has the UNBALance pot VR3 as a...

Page 19: ...ave any effect on the gain UNTIL it rose over 5 5 bias 5V 0 volts which is the point the VCA starts to operate The VCA responds to the envelope as long as it stays above 5V You can think of bias as cl...

Page 20: ...et like a pulse wave this will alter the sound The AC DC coupling switches insert remove a large capacitor in series with the signal This will alter the tone but the effect is highly dependent on the...

Page 21: ...AGE 21 MOTM 110 ASSEMBLY WWW SYNTHTECH COM If you still can not get the module to perform correctly please contact us by phone fax at 817 498 3782 or by email to synth1 airmail net Thank you for purch...

Page 22: ...75dB typical Control Voltage feedthrough 1mv typical after trim Input Impedance 50K min Output Impedance 1K typical RING MOD SECTION X IN Y IN input levels 5V to 5V max Output level 5V to 5V max Carri...

Page 23: ...attenuated CV signal The sum of the GAIN voltage and the CV voltage is used to control the VCA UNBAL Adds a DC offset unbalance to the Y input of the ring mod X LEVEL Attenuates the signal fed into t...

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