AJH Synth MiniMod VCO Manual

AJH Synth Ikke kategoriseret MiniMod VCO

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VCO User Guide

Thank you for purchasing the AJH Synth MiniMod VCO module, which like all AJH Synth Modules,

has been designed and handbuilt in the UK from the very highest quality components. We hope

that it will help and inspire you towards creating some great music and soundscapes!

The discrete all transistor core of this Voltage Controlled Oscillator is an exact emulation of the

original, and now very rare, R A Moog Model D Oscillator from 45 years ago. It features a fully

matched PNP transistor expo. converter and P-FET transistor buer amplier section but with the

advantage of much improved temperature stability and modern construction using reliable

precision SMT components along with Eurorack modular synthesiser expandibility.

It features front panel switchable octave selection and four independent waveform outputs

including the famous “Sharktooth” waveform, Sawtooth wave, Square wave and Triangle wave

and when used as part of a full MiniMod system can provide a very accurate emulation of the

Model D systhesiser and it’s highly acclaimed “fat vintage” analogue sound.

The Square wave output has fully adjustable Pulse Width Modulation, with manual and CV control

rather than the more restricting selection of square wave or two static xed pulse widths of the

original design.

Also included are Exponential and Linear modulation inputs and two dierent types of oscillator

sync which help to make this a very versatile Eurorack VCO in its own right.

Module width is 14 HP of EuroRack space and it is compatible with standard Euro Rack cases. The

height of the panel is 128.5mm, and depth is 38mm. There are four mounting holes at the corners

of the module and we provide 4 of M3 rack xing screws, along with a Eurorack compatible

power cable. Current consumption is 55mA from the +12V supply rail and 40mA from the -12V

supply rail.

All AJHSynth modules are covered by a one year guarantee against manufacturing defects.

Notes:

As with all vintage analogue oscillators, after powering up it is best to be allowed to “warm up” for 15

minutes or so before use. Tuning immediately after power up is not advised as it takes time for the

internal circuitry to get up to temperature and stabilise. After the warm up period it will maintain pitch

well - much better than the original on which it is based!

It is very important that the power supply ribbon cable is connected correctly, see the “adjustment and

calibration” section for an illustration of the correct orientation.

Vintage discrete transistor core VCO

www.ajhsynth.com

mod

1 Octave Switch

5 Exp. CV Level

9 Sync Threshold

4 Exp. CV Input

10 Sync Type

8 Sync Input

3 1 V / Oct. Input

Linear CV Level 7

6 Linear Input

PWM Control 16

PWM Shape 15

Shark Output 13

Saw Output 11

Square Output 14

Triangle Output 12

Tune Control 2

1 Octave Switch : Use the Octave switch to quickly select preset octaves, the Lo setting reduces the oscilla-

tor frequency into the Low Frequency Oscillator range so that it can be used as a modula-

tion source.

2 Tune Control : The tune control varies the oscillator pitch by around +/- 8 notes. Larger variations in

pitch can be obtained by applying a positive or negative control voltage to the 1 Volt per

Octave input (3)

3 1 V/Oct. Input : This is the 1 Volt per Octave control voltage input. Applying a positive voltage to this

input raises oscillator pitch at the rate of exactly one octave for each volt applied, and a

negative voltage will reduce the pitch by exactly one octave per volt. The acceptable

input range is +/- 7 Volts. A limitation of the vintage oscillator core design means that

tracking may not follow the 1V/Oct law above 10KHz

Distribution Buss 1V/Octave CV signal:

The Eurorack power distribution buss can transmit a 1V/Octave voltage from a Mini/CV

converter or similar source. The MiniMod VCO accepts this signal by default as it is “normalled”

through the 1V/Oct socket, however plugging a jack into the 1V/Oct socket unswitches /

defeats this control voltage and allows the VCO to run free.

4 Exp CV Input : This is the Exponential Control Voltage input. Acceptable input voltage range is +/- 5V.

When a voltage is applied to this input it varies the oscillator pitch in a similar fashion to

the 1 V/Oct input, however the amount of control voltage applied to the oscillator core

can be regulated using the Exponential CV Level control (5).

5 Exp. CV Level : This control adjusts the amount of voltage from the Exp. CV input that is passed to the

oscillator core, its range is 0 to 120%.

Controls, Inputs and Outputs

Produkt Specifikationer

Mærke:	AJH Synth
Kategori:	Ikke kategoriseret
Model:	MiniMod VCO

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