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Build Document last updated april 2024
Version 1.0 2024
The Ladder to the Moon is a massive sounding monophonic CMOS based
guitar synthesizer with two oscillators - A saw / square oscillator fixed at
one octave down with two types of phaser modulation (smooth or
stepped). The other oscillator is a tunable and tracking oscillator that can
be tuned from about one octave down to one octave up and anywhere in
between. It has a vibrato with a fixed rate.
This pedal works best with high output pickups. It is gated by nature of the
CMOS logic. If you are using single coils and need more sustain, try a boost or
compressor in front. To improve tracking, use the neck pickup on your guitar
and play single notes closer to the 12
fret.
th
Have fun building and playing the Ladder to the Moon!
Prototype build
Named after the use of resistor ladders in the circuit,
but also after the art by Georgia O'Keeffe
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Summary of Contents for PARASIT STUDIO LADDER TO THE MOON
- Page 1 Build Document last updated april 2024 Version 1.0 2024 The Ladder to the Moon is a massive sounding monophonic CMOS based guitar synthesizer with two oscillators - A saw / square oscillator fixed at one octave down with two types of phaser modulation (smooth or stepped).
- Page 2 Power Input voltage - 9V DC Current draw - 34mA Controls Potentiometers Level – overall volume • Rate – controls the rate of the phaser (oscillator 1) • Blend – blends between the two oscillators • Tune – tunes oscillator 2 •...
- Page 3 General building tips • Just follow the Bill of Materials and solder the low profile components first. Recommended order: resistors and diodes, chip sockets, resistor ladders, trim pot, multilayer and ceramic capacitors, film box capacitors, electrolytic capacitors, pots and switches, offboard wiring (jacks and the 3PDT switch).
- Page 4 Ladder to the Moon BOM (Bill of Materials) Resistors IC's CD4069(UBE) CD4046(BE) 220K CD4040(BE) CD4040(BE) 470K CD4040(BE) 4.7K LM339N (or AN) Capacitors Potentiometers 100nF LEVEL A100K 100nF RATE 100nF BLEND B50K 100nF TUNE B50K 220nF 2.2nF DEPTH (trimpot) 1M 4.7nF Switches 4.7K...
- Page 5 Drill Template (1590BB) • Use at your own risk! This template is approximate. • Make sure your printer isn't doing any scaling (100% print size). • Jacks are measured from the edge at the front/top of the enclosure (as they were drilled on the prototype), but you can drill the positions for the footswitch, DC jack and input/output jacks to your own preference.
- Page 6 Off Board Wiring The top row of connections on the 3DPT daughterboard connects directly across to the main PCB as shown. → Input jack sleeve ”S” IN pad the lug that connects with the inner ring of the jack → Input jack tip ”T”...
- Page 7 Mods Suggested mods: • Make the vibrato depth trimpot external Insted of the trimpot you could use an external B1M potentiometer. Wire the middle trimpot solderpad to pin 2 on the pot and wire the right trimpot solderpad to pin 3 of the pot. Leave pin 1 unconnected. Just be aware the a very deep vibrato will negate the tuning of the oscillator.
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Page 8: Troubleshooting
Take your time and don't rush. Take a break now and then. Use good solder, and it helps to have a decent soldering station insted of a cheap iron. If you are still having trouble, please visit the madbean forum Parasit Studio subforum section and ask for help there. http://www.madbeanpedals.com/forum/index.php?board=84.0 If you have bought the Musikding kit and have recieved a faulty or missing component, please contact musikding directly.
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