First, we will solder the resistors. You can recognise them by color code or by quantity (3x10k, 2x680). 1k starts with brown-black, 470 has violet and yellow colors. The remaining one is 3k9.
This page contains pictures of the required steps to build Synthomir synth. To find out more about Synthomir synth, check the Radiona's synthomir wiki page or the source files at https://bitbucket.org/radiona/synthomir.
Shipping not included
| Value | Quantity | Designator(s) |
|---|---|---|
| Capacitors | ||
| 22p | 2 | C5 C6 |
| 100n | 2 | C1 C3 |
| 100n | 1 | C7 |
| 2u2/25V | 1 | C2 |
| 4u7/16V | 1 | C4 |
| Resistors | ||
| 470 | 1 | R7 |
| 680 | 2 | R2 R3 |
| 1k | 1 | R4 |
| 10k | 3 | R1 R5 R6 |
| R | 1 | R8 |
| LDR | 1 | LDR1 |
| POT | 1 | RV1 |
| Headers | ||
| mono/stereo | 1 | JP1 |
| boot mode | 1 | P4 |
| Connectors | ||
| DC JACK | 1 | CON1 |
| AUDIO_OUT | 1 | P7 |
| Other | ||
| DIODE 1N4007 | 4 | D1 D2 D3 D4 |
| LED (power) | 1 | D5 |
| LED (indicator) | 1 | D6 |
| ATMEGA328-P | 1 | IC1 |
| on/off switch | 1 | SW1 |
| SW_PUSH | 1 | SW2 |
| LP2950-33 | 1 | U1 |
| 16MHz | 1 | X1 |
First, we will solder the resistors. You can recognise them by color code or by quantity (3x10k, 2x680). 1k starts with brown-black, 470 has violet and yellow colors. The remaining one is 3k9.
After resistors, solder crystal and its capacitors.
Then, we'll solder LDR (photoresistor).
After LDR solder the diodes. Notice: diodes are polarized which means that the side with white/gray strip shouldd be placed according to the line on PCB.
Then the voltage stabilizer.
Then we will solder some 100nF capacitors (they can be whiteish-yellowish too)...
and a push-button...
an ON/OFF switch...
electrolytic capacitors (these are polarized too — longer pin is + and - is marked on a case.).
Next is the socket for the ATmega chip — note the notch on the case and on the PCB silkscreen.
And the LEDs (shorter leg is cathode and it also has dent on the case).
Audio output connector...
mono/stereo selector...
boot mode selector and the video out (optional) selector
Then we will solder female headers, ...
potentiometer...
and the male headers on the bottom side of the board.
And this is fully soldered PCB:
And then we break it:
And we have our synthomir synth:
19/09/15 New content including Synthomir manual comming soon, stay tuned.