AJH Synth MiniMod VCF Manual

AJH Synth Ikke kategoriseret MiniMod VCF

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VCF User Guide

Thank you for purchasing the AJH Synth MiniMod VCF 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 MiniMod VCF is a very faithful replica of the four pole 24db/octave low pass lter used in the

early Model D synthesiser. By using fully matched discrete ladder transistors along with audio-

phile grade capacitors and operational ampliers in the audio signal path, it captures the vintage

sound and vibe of this epic lter and combines it with the versatility of the Eurorack modular

format.

The front panel provides a three channel input mixer and a large lter cuto control, along with

1/3 and 2/3 CV inputs to emulate the action of the original VCF keyboard switches. There is also a

variable Exponential CV input which is about 30% more sensitive than the 1v/oct input, which

allows some nice over modulation eects.

Added features include Voltage Controlled Emphasis (Resonance) which uses a Vactrol as the

control element. This approach was chosen because it is a purely resistive element and impor-

tantly has no impact on the vintage sound of the lter. The fast acting Vactrol chosen allows

modulation speeds up into the audio range. The lter will of course self-resonate and act as a sine

wave oscillator too.

An overdrive facility can be selected using the onboard jumper which allows the input to the lter

core to be substantially overdriven - great for adding a bit of extra dirt to the sound!

Module width is 14 HP of Eurorack space and it is compatible with standard Eurorack cases. The

height of the panel is 128.5mm, and depth is 26mm . There are four mounting holes at the

corners of the module and we provide 4 of M3 rack xing screws, along with a Eurorack compat-

ible power cable. Current consumption is 45mA from the +12V supply rail and 30mA from the

-12V supply rail.

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

Note:

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.

Discrete Transistor Ladder Filter

mod

www.ajhsynth.com

IN 2

2/3 CV1V/Oct

IN 3IN 1

INPUT 1

FREQ CV EMP CV

INPUT 2 INPUT 3

EMPHASIS

FREQ-CV OUT

EMP-CV1/3 CV

-2

-4 4

TRANSISTOR LADDER FILTER

mod

2 8

4 6

010

2 8

4 6

010

2 8

4 6

010

0 10

FREQ

7 Cuto Freq.

9 Freq. CV Level

4 Input 1 Level

11 1/3 CV Input

10 1V/Oct Input

8 Freq. CV Input

1 Audio Input 1

Emph. CV Level 15

2 Audio Input 2

Input 2 Level 5

Input 3 Level 6

2/3 CV Input 12

Emp. CV Input 14

Audio Output 16

Audio Input 3 3

Emphasis Level 13

1 Audio Input 1 : Audio Input 1 forms part of a 3 input audio mixer which is attached to the front end of the

lter. This Input is mixed with Input 2 and Input 3 at a level set by Audio 1 Level control

(4). Typically the output from a VCO would be connected to this Input, but any AC signal

with a level of up to +/- 5 Volts is acceptable. .

All three Audio Inputs are for audio signals only, the lter signal path is AC coupled so DC

control voltages are not useful here but will not cause any problem if accidentally

connected.

2 Audio Input 2 : Audio Input 2 forms part of a 3 input audio mixer which is attached to the front end of the

lter. This input is mixed with Input 1 and Input 3 at a level set by Audio 2 Level control

(5). Signal levels of up to +/- 5 Volts are acceptable.

3 Audio Input 3 : Audio Input 3 forms part of a 3 input audio mixer which is attached to the front end of the

lter. This input is mixed with Input 1 and Input 2 at a level set by Audio 3 Level control

(6). Signal levels of up to +/- 5 Volts are acceptable.

4 Input 1 Level : Sets the amount of signal from Audio Input 1 (between 0% and 100%) that is mixed with

Audio Inputs 2 & 3 and sent to the lter core.

5 Input 2 Level : Sets the amount of signal from Audio Input 2 (between 0% and 100%) that is mixed with

Audio Inputs 1 & 3 and sent to the lter core.

6 Input 3 Level : Sets the amount of signal from Audio Input 3 (between 0% and 100%) that is mixed with

Audio Inputs 1 & 2 and sent to the lter core.

Controls, Inputs and Outputs

7 Cuto Freq. : The Cuto Frequency control manually varies the cut o frequency of the low pass

lter. At the minimum setting (fully counter clockwise) the lter will cut o all frequencies

with no audio output and at the maximum setting the lter will pass all frequencies. It is

still active when using CV control, in which case it acts as an oset control.

(Audio)

Produkt Specifikationer

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

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