GM LAB PICOSYNTH Bedienungsanleitung

PICOSYNTH MONOPHONIC SYNTHESIZER

A DIGITAL SYNTHESIZER PROJECT BASED ON RASPBERRY PI PICO

Thank you for purcha ing GMLab Pico ynth! Whether you bought the kit

ver ion or the pre-a embled ver ion, plea e refer to thi document for

ba ic information and in truction . If you purcha ed the kit ver ion,

plea e refer to the full ver ion of the guide that you will find online,

here:

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Pico ynth i a ba ic monophonic ynthe izer, ea y to learn and to operate

with all the ection well defined by labeling . It al o have few nice

add-on like the pre et management and a delay ection. Two o cillator

with 5 waveform , L.F.O., filter, envelope, mixer and glide control.

If you are reading thi document or you purcha ed GMLab Pico ynth, you're

likely familiar with ynthe izer , you know how to operate them and how to

generate, manipulate and modify the ound.

No power upply unit i upplied with a KIT purcha e. GMLab Pico ynth

require a 12v DC 500mA minimum power upply in order to correctly

operate. The e are very common and it' likely that you already have one

compatible laying around omewhere. Ju t be ure that the DC male plug i

5.5/2.1 with the po itive in the central pin and the negative in the

external frame of the plug.

You can al o u e a power upply with le voltage (for example 9v) but

plea e don't u e the one for guitar pedal , they are normally with center

negative. You can al o power on your Pico ynth ju t connecting a MICRO-USB

cable into the Ra pberry PI PICO port but we won't ugge t to do thi for

a long period of time. U ing a different power ource that the one

ugge ted (12v DC) won't harm your in trument, unle you connect a power

upply with a voltage higher than 12v; but thi will affect the audio

quality becau e the operational amplifier circuitry u ed in thi project

i de igned around 12v DC for optimal performance.

GMLab Pico ynth i ending out mono audio from the headphone 3.5 jack

plug and the 6.3 jack plug: you can u e them at the ame time.

The MIDI connector of GMLab Pico ynth i a MIDI IN port, there you are

uppo ed to plug a device capable of ending MIDI, typically MIDI NOTE

ON/OFF me age . Plug there your MIDI keyboard, your computer or your

equencer. Pico ynth recognize MIDI data on CH1 and upport MIDI USB.

It recognize CC#1 (modulation wheel) and pitch bender, PC# from 0 to 31

and the "all note off" me age.

With the "+" and "-" pu hbutton you can croll the pre et , pre "STORE"

to ave a pre et (overwrite the exi ting one). To activate the "MANUAL"

mode pre the pu hbutton "+" and "-" at the ame time: when "MANUAL"

mode i engaged, the in trument will ound exactly re pecting the actual

potentiometer' po ition.

If you would like to revert to factory default (original pre et ), pre

and hold "-" with your Pico ynth off and connect the power upply.

GMLAB Pico ynth i old on-line on the web ite www.gmlab.it and on

www.MyRigShop.com by V.M.Connection, an enterpri e ba ed in Italy.

You can get the project file for thi and other GMLab project on our

GitHub account:

http ://github.com/ZioGuido

If you need pare part or blank PCB , ju t let u know.

All trademark mentioned in thi document belong to their re pective

owner and are u ed for reference purpo e only.

MOUNTING INSTRUCTIONS

Welcome to the mounting in truction heet for the GMLAB Pico ynth

monophonic ynthe izer. To a emble thi kit correctly and et it up to

work properly, a good kill and experience with electronic and computer

i required, plu ome tool and a little bit of patience and attention.

You mu t be able to recognize electronic component , re i tor ,

capacitor , integrated circuit , you mu t be able to older them properly

on the PCB.

Plea e note that we are not re pon ible for in trument not working due to

improper mounting, improper oldering/de oldering of component or part

broken during the mounting proce .

REQUIRED TOOLS

1. Soldering iron, preferably a temperature-controlled 60W iron with a

1,5 ~ 2,5 mm wide tip;

2. Solder tin wire, preferably good quality 0,8 ~ 1 mm diameter;

3. Good quality cutter , plier , crewdriver ;

4. Patience.

PREPARATION

Prepare a clean and tidy urface, with ju t the required tool handy and

make ure you have di charged your body from electro tatic charge by

touching ome metal object that make contact with the floor. Optionally,

wear an ESD wri tband.

WHAT'S IN THE KIT

1x Active Panel bottom PCB

1x Top Panel PCB with premounted SMD component

1x Front panel PCB

1x Rear panel PCB

1x Left panel PCB

1x Right panel PCB

20x REDCUBE

5x Rubber feet

5x M3x20 M/F HEX pacer

28x M3x5 crew

3x M3 nut

7x Pu h witch

2x 7-Segment di play

30x Tran parent potentiometer

2x 40 pin long female header

4x 20 pin long male header

4x 20 pin hort female header

4x 20 pin hort male header

1x 2 pin hort male header

1x Jumper

1x 6 pin hort male header

1x 9 pin hort male header

1x IC LM4558 or TL072 or TL082

1x IC 6N137

1x IC 7805

1x IC 7809

1x IC 1117

4x IC CD4051 or equivalent

1x IC 74HC165 or equivalent

2x IC 74HC595 or equivalent

1x IC 74HC138 or equivalent

2x Ra pberry PI Pico

1x DAC board

1x Jack TRS 6.3

1x MIDI Connector

1x DC Connector

10x 100nF ceramic capacitor

3x 10uF electrolitic capacitor

2x 1uF capacitor

2x 10kOhm re i tor

2x 220Ohm re i tor

2x 51kOhm re i tor

2x 100kOhm re i tor

3x 1kOhm re i tor

NOTE ABOUT REDCUBES

Redcube are little component that allow to fix the ide panel of the

ynthe izer without compromi ing the ae thetical end re ult of the

product. They need to be oldered to the bottom and top PCB . The

procedure i not very ea y and we ugge t to do thi operation before

anything el e.

You are required to older 10 piece on the bottom PCB and 10 piece on

the top PCB: 2 piece on every angle plu 2 piece in the middle. Plea e

take a look at the PCB in order to find out where they are located.

Once mounted you will be able to fix the ide panel of your ynthe izer

with the crew to improve the overall tructure and appearance.

The oldering procedure require time: plea e follow our in truction

carefully!

- Locate a REDCUBE pad and place one on it: be ure that the two mall

pin are in ide the 2 mall hole in the pad.

- You will notice that the pad i a little bit bigger in the in ide area:

that i the place where you have to tart oldering it.

Put the tip of your oldering iron there and tart applying the oldering

tin wire to it: hold them firmly, don't apply the older tin on the pad

before po itioning the REDCUBE, otherwi e it will be difficult then to re-

po ition it again. Plea e don't forget that the area and the redcube will

become very hot!

- You can help your elf in thi operation u ing a tool to firmly hold the

REDCUBE until the older tart melting and attache to the PCB. Don't

move the oldering iron tip!

- The oldering tip need to heat both the PCB and the REDCUBE before the

tin tart melting. Thi require time, it can be from 10 to 30 econd

depending on the temperature.

- When the older tin tart melting you will ee the tin going everywhere

in the pad and al o underneath the REDCUBE, firmly attaching it to the

PCB. You need a lot of older tin there! Wait until everything i well

covered with the tin and then remove the oldering iron tip gently without

dropping the REDCUBE.

- When the older tin i olid again, the end-re ult hould look like

thi :

- You can now proceed with all 20 piece .

ACTIVE BOTTOM BOARD

fig. 1

fig. 2

STEP 1: Let' tart from the electronic . All pa ive component fir t,

tarting from the lowe t till the talle t. Take the re i tor , bend the

terminal 90 degree (if not already bent) and add them to the main PCB in

the correct po ition (check the chematic , ilk creen on the PCB and the

component numbering and value). Do the ame with the capacitor and keep

in mind that electrolitic capacitor do have a polarity.

STEP 2: Let' place and older all the connector (male and female SIL and

DIL header ). Let' tart from the two 2x20 pin female header for the

two Ra pberry PI PICO board .

Then you can proceed with the two 2x20 long male header (the e are u ed

to connect the bottom board to the top board).

Then mount the 2 pin header that i u ed to give or remove power to the

LED underneath the potentiometer in the TOP panel. Adding a jumper the

LED will lit, without the jumper the LED will tay off.

There are two more header that you need to add: they are tho e for the

DAC board:

Now we are ready for the next tep: integrated circuit and the two

Ra pberry Pi Pico board .

STEP 3: Add the Integrated Circuit . Pay attention not to keep the older

pin for too long, and that all pin have been oldered correctly. Do not

older two or more pin together, each pin i oldered eparately from the

urrounding . Al o pay attention to the direction and polarity. Drawing

on the PCB have a notch on a ide indicating where pin 1 goe . The ame

notch i generally pre ent in the IC it elf, or you'll al o find a mall

dot. Plea e take a clo e look at the code in the integrated circuit

(they all look the ame but they have different code , 4051 i not 595,

6N137 i not the OPAMP!). Thi i a delicate tep, do not make mi take !

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