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Summary of Contents for Oakley Flanger
- Page 1 Oakley Sound Systems 5U Oakley Modular Series Flanger PCB Issue 2 User Manual V2.4 Tony Allgood Oakley Sound Systems CARLISLE United Kingdom...
- Page 2 The Flanger module as a 1U wide MOTM format module.
- Page 3 Introduction This is the User Manual for the issue 2 5U Flanger module from Oakley Sound. This document contains an introduction to the module, some information on how to make the best use of your module and the calibration procedure.
- Page 4 The Oakley Flanger Module The issue 2 Oakley Flanger as a single width MOTM format module in a natural finish Schaeffer panel. The Oakley Flanger module is an analogue delay line capable of delaying audio signals from 0.5mS to 15mS. In conjunction with an external LFO module this unit can be used to produce real time vibrato, chorus and flanging effects.
- Page 5 The delay line itself is based around two 3207 bucket brigade delay (BBD) devices controlled by a voltage controlled oscillator (VCO) running from around 33kHz to over 1MHz. Audio bandwidth of the delayed signal extends to 14kHz and several unusual design features ensure that the module is relatively quiet compared to other units of its type.
- Page 6 – most delay lines would have a delay control that would increase the delay as it is turned up. However, the flanger creates its distinctive sound by a form of notch filtering whereby some frequencies in the audio spectrum are cut and some are boosted.
- Page 7 Whilst having dedicated input level and output level controls is more common in rack effects the Oakley Flanger features a single Drive control. This combines the actions of both the input and output level controls in one control. Turning up the Drive increases the signal level sent to the BBD devices, while at the same time reducing the signal level from the BBD devices.
- Page 8 13V and goes no further. This abrupt flattening of the top and bottom of waveforms creates distortion and is generally not wanted. The Flanger module is quite capable, when feedback is applied, to produce signal levels far greater than what goes in. If the output matched the input perfectly, ie. 5V peak ended up as 5V peak with no feedback, then when feedback was applied the output could easily try to exceed the +/-13V.
- Page 9 If you do find the level of noise objectionable in certain patches try using the flanger module before your final VCA. This way the audio signal, including any added noise, from the flanger will only be heard when the VCA is opened.
- Page 10 Calibration There are seven trimmers, or presets as we used to call them in the UK, on the printed circuit board (PCB). An oscilloscope is required to set several of the trimmers to their optimal positions. You should use a proper trimmer tool or a fine blade jeweller's screwdriver for adjusting the two multiturn trimmers.
- Page 11 Remember, the classic flanging effect does not require either mode to oscillate and some folk will find the unstable nature of an oscillating flanger disturbing. So feel free to set FBK as you wish. Whatever position that FBK is set, the maximum feedback levels are always obtained at the longer delays thanks to the inherent gain drop (insertion loss) of the 3207 BBDs as the clock frequency rises.
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Page 12: Final Comments
Remember that the Flanger will not be able to be made to track perfectly over a very wide range. As such, even if you have achieved a perfect octave spread with your two C notes, you won't be able, for example, to have a perfect octave spread from two similarly spaced C notes a couple of octaves above that.
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