UralTone MiniSynth - kit

UralTone MiniSynth is a compact analog synthesizer. The main objective of the design of the kit has been the idea of making a good-sounding and relatively versatile instrument that also gives the builder joy during build process and opportunities to get to know analog synthesizer technology.

Specs:

• VCO:
  • One oscillator: Saw, Triangle+Square, Triangle ja Square waveforms. PW / PWM. 
  • Sub octave output (Square wave) and noise generator
• VCF:
  • Audio in for VCF
  • 24dB lowpass filter. Self-oscillating at high resonance/feedback.
• Modulation:
  • Two LFOs with triangle and squarewave outputs
  • Envelope generator
• Two overdrive circuits with parallel mixing to clean signal. One post-VCO, second post-VCA 
• Inverse, normalized to envelope outuput
• Preselected modulation sources and destinations selectable with toggle switches. Alternative routing with patch points
• Patch point signal 5Vpp.
• Operates wiht 5-15V, 500mA 2.1mm center positive adapter.
• Dimensions: 25.4cm * 15.2cm * 5cm. (bare enclosure 25.4cm * 15.2cm * 2.7cm)
• Option for midi-in adapter

The design of MiniSynth has used several sources of inspiration: The one-oscillator synthesizer in a compact size is borrowed from the Roland MC202, although there are numerous similar examples. The normalized signal path with the possibility to patch the signal and modulation routing to new ones is familiar from the ARP 2600, while the modulation outputs selected in advance with switches are familiar from the Odyssey. The MiniSynth has two roles: it either works without patch wiring or as a mini-size stand alone modular or as part of a larger modular set.

The MiniSynth circuit uses Alfa Rpar versions of Curtis Electromusic's CEM integrated circuits used in the 80s. The core of the synthesizer is the AS3394, the original version of which has been used in e.g. Sequential Six Trak and Multitrak. This IC includes a synthesizer, VCO-VCF-VCA chain in one chip. The AS3310 is the envelope generator and the AS3360 circuit is used in the LFO at a slightly different angle. Purpose-built circuits enable small size and relatively simple connection with a small number of parts.

For a long time, UralTone's kits have addresed the tone forming by distortion in form of various effect pedals and guitar amplifiers, so distorting the sound is strongly at the core of what we do. As a "home field" addition, an overdrive circuits has been added to the MiniSynth, which is similar to UralTone's Du-o-Fuzz. There are two overdrives, one after the oscillator, the other at the output. This adds even more character and edge to the synthesizer.

The MiniSynth is built entirely from through-hole parts and there are no pre-laid parts on the pcb. This enables easy changes to the circuit, e.g. increasing/decreasing the amount of modulation according to your own taste. Despite the rather large number of parts (e.g. there are about 140 resistors, 70 capacitors), building the MiniSynth does not take an impossibly long time, an experienced builder assembles the device in about four hours.

Very high-quality components

The components for the kit have been selected specifically with the best quality in mind.

Potentiometers and switches have been selected from the options of different suppliers, and we have selected the best ones in terms of feel and structure.

What does the kit include?

The construction kit contains all the necessary parts, excluding the potentiometer knobs on the front panel and the main power supply. All push-on (or screw-on) knobs with a diameter of approx. 15mm or less can be used as knobs.

The price also includes instructions and unlimited technical support. 

Please note: We cannot provide support on how to use analog synths in general, patch them, or connect them to other devices. 

Instructions

The construction kit comes with a connection diagram and parts list. Illustrated construction instructions can be found on the UralTone info pages. We recommend that you familiarize yourself with the instructions before purchasing the set.

Tools

For construction, you need a soldering iron, tin, side cutters and a multimeter. The device requires calibration before use. The pitch can be adjusted by ear using the reference in the pitch. A tuning meter and/or oscilloscope make the task easier, but are not mandatory.

The soldering station must be of at least reasonable quality and the temperature suitable for lead-free tin (approx. 375C often works). We have collected recommended tools here in the hobbyist price category: A beginner's tool kit

It is important to note that the old soldering irons intended for lead-free tin will not work if the temperature is not high enough.

Technical support

UralTone building kits always include unlimited technical support via e-mail. Technical support staff are not normally present in the store, and it is difficult to help over the phone, so our support only works via e-mail.

How long does it take to assemble the kit?

An experienced person can assemble the kit in 4-5 hours, a beginner can take 1-2 days.

Who is this building kit suitable for?

The kit's purpose is to offer a good-sounding and interesting instrument that entices you to use it in different ways. The kit is also suitable for all those who are interested in synthesizers and are willing to learn what analog synthesizers are made of.

What value do you get for your money?

Carefully assembled from our kits, the instrument matches the quality of the most expensive boutique devices. The parts are top-class, and the devices are carefully designed. The price also includes unlimited technical support via email.  With us, the customer is not left alone!