MOTM compatible component parts list

You will find that you can't always buy the part from the supplier offering the lowest price, because of minimum order requirements, so I'll list several suppliers where applicable. Prices given are for each piece unless otherwise indicated.

Props to Larry Hendry, who compiled some of these and saved me a bunch of work. If you have ideas for common and useful MOTM parts that should be listed here, contact me!

Note: in keeping with the MOTM standards for parts quality, only the "good stuff" is listed here. If you want to substitute cheap jacks and pots, do your own research!

Supplier Websites

http://www.aaronsmachinescrews.com (Aaron's Machine Screws, supplier of screws, nuts, washers, fasteners)

http://www.alliedelec.com (Allied Electronics)

http://www.digikey.com (Digi-Key Electronics)

http://www.mouser.com (Mouser Electronics)

http://www.newark.com (Newark Electronics)

http://www.dee-inc.com/netstore/default.asp (Dee Electronics)

1/4" Jacks

Switchcraft #112A - accept no substitutes!

• Allied #932-9391, 1-9 $1.77, 10-24 $1.53, 25-49 $1.26, 50-99 $1.17, 100+ $1.09

• Digi-Key #SC1104-ND, 1-9 $1.92, 10-24 $1.44, 25-99 $1.32, 100-249 $1.20

• Mouser #502-112A, 1-9 $1.92, 10-24 $1.44, 25-99 $1.32, 100+ $1.20

• Newark #39F657, 1-9 $2.13, 10-24 $1.70, 25-49 $1.53, 50-99 $1.38

Lockwashers for 112A - the finishing washer is always supplied, but the lockwasher isn't.

• Mouser # 594-512-0008, 100+ $0.09

Potentiometers

Good sealed pots are expensive and are hard to find retail. Synth Tech's pots are generally custom ordered by Paul in large quantities, and he has to wait months to get them. If you just need one or two, you might try emailing Paul directly and see if he'll sell you a couple. The ones listed below exist as of this writing (Jan. 2001), but may not be  available forever.

Bourns #91A1A-B24-B18, 50K conductive plastic w/ pc terminals, for replacing many Blacet 50K pots

• Allied #754-9418, 1-9 $4.93, 10-24 $4.29, 25-49 $3.69

Bourns #91A1A-B24-B20, 100K conductive plastic w/ pc terminals, for general use

• Allied #754-9420, 1-9 $4.93, 10-24 $4.29, 25-49 $3.69

Spectrol 149 series #149-09-10-104, 100K cermet w/ pc terminals, for high stability uses

• Allied #970-1791, 1-9 $5.36, 10-24 $4.97, 25-49 $4.77

• Mouser #594-149-7104, 1-9 $7.48, 10-24 $6.65, 25+ $5.83

Potentiometer Nuts

Extra nuts for potentiometer shafts, to facilitate stress-free panel mounting. Size 3/8-32

• Mouser #534-1456, 1-99 $0.19, 100+ $0.095

Knobs

Alco #PKES-90B-1/4

• Newark #57F2348, 1-49 $2.82, 50-99 $2.61, 100-249 $2.56

• Dee #PKES90B1/4, 30-49 $1.725, 50-99 $1.38, 100-149 $1.15, 150-249 $0.986

LED (MOTM style flat lens 5mm)

RED: Lumex #SSI-LXH387ID

• Digi-Key #67-1155-ND, 1-9 $1.13, 10-49 $0.90

GREEN: Lumex #SSI-LXH387GD

• Digi-Key #67-1156-ND, 1-9 $1.13, 10-49 $0.90

YELLOW: Lumex #SSI-LXH387YD

• Digi-Key #67-1157-ND, 1-9 $1.13, 10-49 $0.90

Toggle switches

Exact replacements are made by NKK, but others will match visually if you get bat handles with a bright finish.

SPDT - NKK #M2102ES1W01

• Allied #870-8646, 1-24 $4.50, 25-99 $3.87

SPDT center off - NKK #M2103ES1W01

• Allied #870-8647, 1-24 $5.10

DPDT - NKK #M2022ES1W01

• Allied #870-8652, 1-24 $6.25

DPDT center off - NKK M2023ES1W01

• Allied #870-8653, 1-24 $7.10

Pushbutton switches (momentary)

There is no current MOTM standard since no module has yet been released which uses a momentary pushbutton. I like (and have proposed as the MOTM standard) this one:

Red cap: E-Switch RP3502MA-RED

• Digi-Key #EG1938-ND, 1-9 $2.98, 10-99 $2.678

Black cap: E-Switch RP3502MA-BLK

• Digi-Key #EG1932-ND, 1-9 $2.98, 10-99 $2.678

Green cap: E-Switch RP3502MA-GRN

• Digi-Key #EG1934-ND, 1-9 $2.98, 10-99 $2.678

Yellow cap: E-Switch RP3502MA-YEL

• Digi-Key #EG1936-ND, 1-9 $2.98, 10-99 $2.678

You can see a picture of it on the DarkStar panel mounting page.

Rotary switches

Mountain Switch sealed 12 position 1 pole rotary switch (adjustable stop) - used for Larry Hendry's JLH-831 and JLH-822 control voltage switching modules.

• Mouser #105-13571, 1-9 $2.57, 10-99 $2.14

Rack panels

Need a 1U tall standard 19" blank rack panel for your MOTM rack? Or maybe a 5U tall one to cut up because you are making something wider than the 3U blanks you can get from Synthesis Technologies? Here are some that have a textured black finish that looks pretty darn close to the MOTM panel finish.

Standard blank 19" rack panel, 1U tall:

• Allied #724-1901, 1+ $7.83

Standard blank 19" rack panel, 5U tall:

• Allied #724-1908, latest catalog claims they don't sell it over the internet which is bullcrap, because I bought one a few months ago!

Screws for MOTM panels

#8-32 x 3/8 machine screws, Phillips, pan, steel, black, full thread:

• Aaron's Machine Screws #1001SN1352, $3.18 for 100

MTA-156 4 prong power connectors

AMP #640445-4, pcb mount locking post header connector, .156" center

• Allied #512-3452, 1+ $0.11

• Mouser #571-6404454, 1-9 $0.11, 10-99 $0.09 

AMP #640426-4 MTA-156 locking receptacle for cable mount, 18 gauge wire

• Allied #512-3359, 1+ $0.20

• Mouser #571-640-4264, 1-9 $0.20, 10-99 $0.16 

AMP #640551-4 MTA-156 receptacle dust cover

• Allied #512-3407, 1+ $0.17

• Mouser #571-6405514, 1-9 $0.12, 10-99 $0.11

Opamps

Texas Instruments LT1013CP - dual precision low drift DC opamp, use for building control voltage mixers and buffers, etc.

• Allied #735-3671, 1-49 $2.10

• Digi-Key #296-1399-5-ND, 1-24 $2.30, 25-99 $1.836

• Newark #06F9484, 1-24 $2.48, 25-99 $2.28

Analog Devices OP275GP - dual precision low noise opamp, use for building audio mixers, etc.

• Allied #630-9295, 1-24 $2.71, 25-99 $2.19

• Newark #05F8625, 1-9 $2.25, 10-24 $1.94

Texas Instruments TL072 - dual JFET opamp, use for garden variety stuff

• Allied #735-2726, 1-99 $0.66

• Digi-Key #296-1775-5-ND, 1-24 $0.92, 25-99 $0.69

• Mouser #511-TL072ACN, 1-99 $0.74

• Newark #08F9280, 1-99 $0.69

Precision Resistors

Xicon 1% metal film 1/4 watt

• Mouser #271-RRRR, where RRRR is the resistance (e.g. 271-100K is 100K ohms), 1-199 $0.09

Capacitors

Caps are another one of those items which seem to change part numbers randomly with the suppliers for no good reason. Try these:

Xicon aluminum electrolytic, radial leads, 10uF, 50V - use as the primary power supply filter caps at the input power connector.

• Mouser #140-LLRL-50V10, 1-99 $0.24

AVX #SA105E104MAA ceramic, axial leads, 0.1uF - use for secondary power supply filters between each IC's power input pins and ground.

• Mouser #581-SA-105E-104M, 1-99 $0.12

AVX yellow box multi-layer film .001uF (1n0) - use for general purpose timing and decoupling caps, other values are available.

• Mouser #581-1N0J63, 1-99 $0.27

Solder

Kester #24-6337-6401, 331 water soluble core, .020 dia., 1 lb. (This is the water clean solder supplied in MOTM kits)

• Allied #833-1455, 1-9 $16.67

• Mouser #533-24-6337-6401, 1-9 $17.98

Kester #24-6337-8814, 245 no-clean, .050 dia., 1 lb. (This is the no clean solder supplied in MOTM kits)

•  Mouser #533-24-6337-8814, 1-9 $ 12.06

Kester #24-6337-8800, 245 no-clean, .031 dia., 1 lb. (If you want a thinner no clean solder)

•  Mouser #533-24-6337-8800, 1-9 $ 12.86

Power Supplies

If you are building a large system, you may need more current capacity than the standard MOTM supply provides. You may also choose not to use the MOTM supply if you don't want to give up 3 spaces of front panel real estate. These Power One supplies are the same brand as used by Synthesis Technologies. Don't screw up your modular synth by trying to save a few bucks on a cheap power supply! To power a large cabinet (25-30 modules), I recommend this supply:

Power One #HBB15-1.5-A, +15V@1.5A, -15V@1.5A

• Digi-Key #179-2068-ND, 1-9 $57.42

If you need +5V for some digital circuits, here's a couple of nice single supplies:

Power One #HB5-3/OVP-A, +5V@3A

• Digi-Key #179-2035-ND, 1-9 $36.56

Power One #HC5-6/OVP-A, +5V@6A

• Digi-Key #179-2040-ND, 1-9 $57.42

You can also combine everything into a single triple output supply:

Power One #HCAA-60W-A, +15V@1.0A, -15V@1.0A, +5V@6A

• Digi-Key #179-2071-ND, 1-9 $94.00

Power One #HCBB-75W-A, +15V@1.5A, -15V@1.5A, +5V@6A

• Digi-Key #179-2072-ND, 1-9 $109.67

Back to main