Table of Contents
Advertisement
Quick Links
sm
User Guide
Ring Modulator - Dual Sub Bass - Mixer
Thank you for purchasing the AJH Synth Ring SM 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! It has the follow-
ing features:
A Ring Modulator core with a very unique and warm sounding four quadrant multiplier that
includes three inputs, X, Y & Z. It is a vintage design based entirely on a discrete transistor core,
and includes an extra, resonant Z modulator input. It also has a frequency doubling switch; from a
single triangle or sine wave input an octave +1 output is generated.
Two independent Sub Bass generators with very fast tracking, creating -1 Octave and -2 Octaves
from the X input. These are not simple square wave subs, they generate shaped waveforms that
vary from a trapezoid wave with rounded edges at lower frequencies to sine like waveforms at
higher frequencies and are useful up to 1kHz. They have a much lower harmonic content than
square wave subs, designed to have more power and sit much better in a mix.
A ve input DC coupled mixer based on the discrete transistor CP3 modular design dating back to
the early 1970's. The outputs of the ring modulator, X and Y inputs and Sub Bass outputs are
routed to the mixer by default – plugging a patch cable into any of the mixer inputs defeats this
normalising and allows it to be used as a regular 5 channel mixer for both audio and control
voltages.
A clipping / distortion module – input 5 of the mixer is considerably "hotter" than the other four
mixer channels and will clip the signal as soon as it hits threshold level. If a DC bias voltage is
added the signal is shifted and this allows positive or negative asymmetric clipping of the wave-
form
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 24mm, or 34mm with the power cable attached.
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 50mA from the -12V supply rail.
All AJHSynth modules are covered by a one year guarantee against manufacturing defects.
Notes:
It is important that the power supply ribbon cable is connected correctly, see the "Power Cable Orienta-
tion" section for more details. Also, we recommend that a high quality, low noise Eurorack power
supply is used with this modules, some switched mode PSU's generate high levels of line ripple which
may cause undesirable audio noise on the output.
www.ajhsynth.com
Advertisement
Table of Contents
Summary of Contents for AJH Synth Ring SM
- Page 1 Ring Modulator - Dual Sub Bass - Mixer Thank you for purchasing the AJH Synth Ring SM module, which like all AJH Synth Modules, has been designed and handbuilt in the UK from the very highest quality components. We hope that...
- Page 2 Controls, Inputs and Outputs 2 Y Input Level Z Input Level 1 X Input Level X Mix Level (Mixer Channel 2 Level) RM Output Level Y Mix Level (Mixer Channel 1 Level) (Mixer Channel 3 Level) Sub -1 Level Sub -2 Level (Mixer Channel 4 Level) (Mixer Channel 5 Level) Output Level...
- Page 3 This control serves a dual purpose. 5 X Mix Level: 1) This sets the X Input Mix through Level - The signal from the X Input jack (11) is automatically routed (normalised) to Mixer Channel 2 and this knob controls the level of X Input signal that is fed through the mixer to the Output Level Control (14) This allows the original X (Carrier) signal to be mixed with the Ring Modulator and Sub Bass outputs.
- Page 4 Note: This e ect is possible because a four quadrant multiplier (such as that in the Ring SM) produces the sum and di erence of the Carrier and Modulator inputs. If the same frequency is...
- Page 5 +/-10V can be tolerated, but depending upon the setting of the X Input Level control (1) the Ring Modulator output may be distorted and /or clipped. Main Output fdrom the Ring SM Module. Nominally +/- 5V (10v p-p) Eurorack levels, the Output Jack : output level is dependant upon input levels and the setting of the Output Level Control (9).
- Page 6 - in this case the sum is 2 times the input frequency and the di erence is zero as both signals are the same. The inputs of the Ring SM are AC coupled, so xed control voltages will not have any useful e ect.
- Page 7 Sub Bass Modules: The Sub Bass waveforms for both Sub -1 and Sub -2 are generated from the waveform that is applied to the X Input. They are very fast tracking, usually locking on within one cycle, but they do depend upon the waveshape of the signal used (which is connected to the X input).
- Page 8 Power Cable connection Note: This information is given for completeness, the Ring SM is calibrated after manufacture and under normal circumstances should not require any user adjustment. Bias Trimmers Power Cable Red Stripe aligns with -12V as shown FOR MANUFACTURER ADJUSTMENT ONLY. These four trimmers are for adjustment of A Bias Trimmers : the ring modulator core.
Need help?
Do you have a question about the Ring SM and is the answer not in the manual?
Questions and answers