This is an advanced project and requires solid soldering skills and a good knowledge in electronics. The kit includes only a PCB and a front panel and it’s available at €85 plus shipping. You will need to provide all the components you’ll find in the BOM and, if you’d like, a nice wooden box.
All the components are soldered on the top part of the PCB apart from potentiometers and LEDs which will be the last to be mounted on the back.
All component values are screen printed on the PCB apart from diodes (1n4148) and NPN transistors (2n3904) which have only a symbol to indicate the component rotation.
The resistors are mounted vertically and there’s room to bend the voltage regulator so it can lay down close to the board. The clock in (CI), clock out (CO), audio out (OUT) ground (GND) and 9V connector holes are on the top part of the board so to ease the wiring process.
Once all the components are placed and soldered is time to rotate the board on its back to solder the 100K pots.
Near the three potentiometer leg holes you will find a little cross that indicates where the shaft needs to be: be careful, they don’t have all the same orientation!
The LEDs must be put in place but NOT SOLDERED yet.
Now fix all the 4mm banana jacks on the black panel, and trim a bit of the back metal conductor so they can enter the pcb holes more easily.
Put the boards together, be careful because if the potentiometers are even slightly bent from their position the process will be more difficult. Put the nuts on the potentiometers so the boards are tighly fixed together. Now on the component side of the pcb you should see each banana jacks rear coming out of its respective hole and the LEDs legs still hanging there. Push each LED towards the panel into its own hole then proceed to solder them and the banana jacks.
Install and solder the 3.5mm clock IN and OUT jacks and that should be it… “Easy like a sonntag morgen”!
General considerations and some hacking ideas:
The boards are fully tested and 100% working, the outcome of this project is higly dependent on your soldering and building abilities. There will be very limited support or troubleshooting help with this project.
Liquid Foam works well also at 9V so you can switch the LM7805 with a LM7809 and a 12V+ power supply!
Pin 8 of the lm13700 is a bandpass filter out (needs amplification)
Pin 2 of the “blendB_pot” is the raw VCO output (needs buffering)
Pin 2 of the “pitch_pot” is VCO cv in (needs series resistor)
Pin 4 of the 4069 is the sequencer’s TRIG out (needs buffering)
Bill of materials:
ICs:
Voltage regulator:
lm7805 (TO-220) or lm7809 (if you use a 12VDC PSU)
cmos:
40106 1x
4069UB 1x
4070 1x
4040 1x
4052 1x
4053 1x
4015 1x
op amps:
lm358 2x
lm324 2x
lm13700 1x
Resistors:
1k 6x
4.7k 17x
10k 13x
27k 1x
47k 6x
100k 28x
470k 1x
1M 4x
Pots:
Capacitors:
ceramic:
1 nF 5x
4.7nF 1x
electrolytic:
1uF 2x
4.7uF 2x
10uF 2x
Diodes:
1N4148 7x
5mm LEDs 10x
transistor:
2n3904 5x
Jacks:
3.5mm mono audio jack 2x