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Summary of Contents for OSKITONE OKAY Synth
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- Page 2 © 2018 Oskitone For OKAY Synth DIY Kit V ersion 1.1.1 http://www.oskitone.com/product/okay-synth-diy-kit OKAY 2 Synth DIY Kit Version 2.1 http://www.oskitone.com/product/okay-2-synth-diy-kit Last updated 2018-02-18 All rights reserved. This book or any portion thereof may not be reproduced ...
- Page 3 Thank you and congrats on your new OKAY DIY Kit! Please let me know how it goes, what you think, and/or if you run into any trouble. Reach me at tommy@oskitone.com. You can also find last minute guide updates, extra assembly ...
- Page 4 Hey, OKAY! The OKAY is a monophonic, analog, square-wave synthesizer. It is intentionally minimal. ● Monophonic: Only one note at a time can be played. This is opposed to “polyphonic,” where multiple simultaneous notes can be played. ● Analog: There are no computers, microcontrollers, sound samplers, or anything digital involved.
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Page 5: Table Of Contents
Table of Contents 1. 3D-Printing instructions a. Slicing b. Post-printing 2. What’s in the box a. Inventory b. Tools (not in the box) 3. Enclosure assembly 4. PCB assembly a. General tips b. Connecting wires c. Wiring diagram d. 386 0.1.1 Wiring the ¼”... -
Page 6: Slicing
No Normal n/a ** * key plungers are only for OKAY 1 ** key cradle is only for OKAY 2 ** first value is for OKAY 1, second is for OKAY 2 Refer to http://oskitone.com/guides for additional instructions. ... -
Page 7: Post-Printing
Printing ● The enclosure models are pretty big and so can be prone to warping or curling up from the print bed over time. Minimize that risk by using a filament with low shrinkage like PLA and ensuring good bed adhesion. ●... -
Page 8: What's In The Box
What’s in the box Inventory ● PCB kits ○ bus 0.1.1 ○ 555_4040 0.1.1 ○ 386 0.1.1 ○ SPST_VR 0.2.2 15 ○ OKAY 2 upgrade parts (only if OKAY 2) ● 3D-printed parts ○ Bottom ○ Top ○ Hinge links (4) ○... -
Page 9: Tools (Not In The Box)
○ Twisted 2-conductor wire ■ OKAY 1: 33” ■ OKAY 2: 38” ○ Threaded brass insert * * If you’re 3D-printing the parts yourself, your kit will come with an extra ¼” screw and one threaded brass insert. Tools (not in the box) ... -
Page 10: Enclosure Assembly
Enclosure assembly 1. Back hinges a. With one hand, hold an anchor link into its cavity on the enclosure bottom b. With the other hand, thread filament through holes c. Repeat for all hinge links, cutting filament with a small amount of slack (maybe 1/16”) ... - Page 11 you break one, the glue will still hold it in place, but still try not to!) 6. Secure hinge and clasp filament a. Optionally, secure the hinge and clasp filament in place with either a dab of glue or by melting it in place with a soldering iron.
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Page 12: Pcb Assembly
PCB assembly General tips ● Soldering This guide assumes you already know how to solder. If you don’t, don’t worry! There are plenty of really good guides online; I recommend the “Adafruit Guide To Excellent Soldering”. ● IC chips are static-sensitive The included IC chips, especially the CD4040, can be ... - Page 13 ● Wire polarity This kit includes 2 conductor twisted wire, which you’ll use to connect the various boards together. To ensure polarities match between connections, a good convention is to have the lighter wire be positive and the darker wire negative. ●...
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Page 14: Connecting Wires
Connecting wires The boards and enclosure-mounted components connect together with the included hook-up wire and ribbon cable. Use a ruler and wire cutters to cut the bulk collection of wire down to the required individual lengths. * denotes measurements for the OKAY 2. ... -
Page 15: Wiring Diagram
Wiring diagram ... - Page 16 386 0.1.1 This board uses an LM386 chip to make a very simple amplifier. Name Value Explanation C1 10uF Used for distortion. Should be omitted for the OKAY. capacitor C2 .1uF (104) Bypass capacitor C3 220uF For speaker amplification C4 ...
- Page 17 The configuration for VR1 is for an on-board trimming potentiometer. The okay’s volume potentiometer is off-board, so VR1 can go unused. To determine polarity, view the potentiometer from the top with its shaft pointed at you and the leads pointing down.
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Page 18: Wiring The ¼" Jack (For Okay 2 Only)
Wiring the ¼” jack (for OKAY 2 only) The 386 PCB has one SPK output, and the jack is wired between it and the actual speaker. Note that the jack’s ground pin is connected to both the PCB’s and speaker’s ground. ... - Page 19 ● The included potentiometer is linear but would actually be better if it were logarithmic, due to the way humans interpret volume. Luckily, it’s easy to to approximate a logarithmic response by connecting the ground and output pins (left and middle, when viewed from the top) with a smaller resistor.
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Page 20: 555_4040
555_4040 0.1.1 The 555_4040 board uses two ICs: 1. LM555: timer wired as an astable mutlivabratory (oscillator) 2. CD4040: ripple-carry binary counter/divider (frequency divider) The 555 (IC1) is the heart of the OKAY. It oscillates at a frequency determined by R1, R2, and C1. Its output is piped to the input of the 4040 (IC2), where it’s divided 12 times to ... -
Page 21: Wiring The Rotary Switch
IC2 CD4040 Divider IC, in socket 1-6, CD4040 Octave outputs. The number is how 7-12 output many times the root note is being divided, so a lower number is a higher pitch and vice versa. Wiring the rotary switch The rotary switch has six positions, which will each ... - Page 22 It’s up to you which CD4040 output pins you want to pick, but I tend to go with 4-6 and 7-9. The higher octaves (pins 1-3) can be painfully high for human ears, and the lower octaves (pins 8-12) sound more like a metronome than musical notes. ...
- Page 23 only audible when the lower frequency allows. If you send each output through its own resistor (maybe around 10k ohm), their sounds will mix together instead of modulate. ...
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Page 24: Bus 0.1.1
bus 0.1.1 The bus board redistributes power from the battery to u p to four other places. For the OKAY, that’s the 386, 555_4040, and LED. One spot is left unused. Name Value Explanation S1 On/off Connects to the two leads on the switch ... -
Page 25: Polarity On Middle Pads
Polarity on middle pads Note the white silkscreen lines on the top of this PCB. The thick solid lines indicate the flow of electricity. From the above image, you can see that it starts from the battery’s +, moves to the S1 switch, and then is distributed across the ... -
Page 26: Spst_Vr
SPST_VR 0.2.2 This board effectively functions as one big potentiometer. Its name derives from the Single Pole Single Throw (SPST) pushbuttons and Variable Resistor (VR) trimming potentiometers. Name Value Explanation SPST Pushbuttons * 13 Key button, each to a (top) ... - Page 27 No polarity, so connection order doesn’t matter. Before you start soldering, notice that there are 15 columns but you only have 13 buttons and 13 trimpots. That’s because you’ll skip the 6th and 14th columns. The skipped pushbuttons remain unchanged, but the skipped pots should have their pins shorted together, as indicated ...
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Page 28: Wiring For Okay 2
Wiring for OKAY 2 See how the A# and B pads are mirrored on the left and right sides of the PCB? That’s so multiple boards can daisy-chain together and extend the keyboard’s range. The OKAY 2 does this for its two octaves. Solder the two boards together as indicated. -
Page 29: Putting It All Together
Putting it all together Testing and debugging With everything connected, plug in the IC chips to their sockets, add a 9v battery, turn it on, and press one of the buttons. If it made a sound, it works! Now go through all the buttons and make sure that they each make a sound. -
Page 30: Final Assembly
○ The 386 IC’s output and speaker output will have a large voltage square wave ● If all else fails, contact your friendly Oskitone representative! :) Final assembly If all is well and the electronics are working correctly, we ... - Page 31 d. For the OKAY 2, screw SPST_VR boards into key cradle and secure with hex nut on cradle underside. 2. Keys (for OKAY 2) a. The keys have matching screw holes for the top row of the key cradle. Secure each together with a screw and nut. ...
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Page 32: Tuning
g. Rotate the rotary switch and its knob to an angle that you like. Then remove knob, tighten switch to enclosure top, and reapply knob h. Optionally, fix label into place with some hot glue or other permanent adhesive Tuning For the OKAY 1, the notes are arranged C to C, from left to ... - Page 33 You can try to substitute for a new pushbutton (just search for “6x6x6 tactical switch”) but may find replacing the entire SPST_VR board easier. Contact Oskitone for help. ● The OKAY’s 3D-printed plastic is susceptible to warping under hot temperatures. Keep it out of prolonged ...
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Page 34: Appendix: Circuit Schematics
Appendix: Circuit schematics ... - Page 35 ...
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