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PRC1 - PTDelay


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The PRC1 is a delay effect with characterful sound using the PT2399 chip under voltage control. The new Rev.2 version not only adds a new Delay Output, but has also had radical work done to the internals to greatly improve the response and sound.

The chip is actually digital and is designed to give around 0.5 seconds of delay time. Things are setup, though, to avoid the crisp, clean digital sound and the range of delay times is expanded into much more interesting realms. At short settings you get very pleasant 'traditional' delay effects, surprisingly analogue in sound due to careful selection of frequency components. Cranking the delay time to longer settings brings about some extreme digital interference in wonderfully strange forms - it becomes much more of a sound mangler or can even be used without any input, purely listening to the internal interferences.

Modulation of the delay time is a pretty non-linear affair, but an area for some weird and wonderful possibilities. Effects such as flanging aren't really possible (typical for other modulated delays), but extreme pitch wobble is very possible - try a squarewave modulation for rhythmic pitch-shifting.

There are two CV inputs - one is full range while the other has a depth control. Two audio inputs are summed together before the delay effect and the effect balance can be set between fully dry and fully wet - this feeds the main Mix Output. A bypass switch is also provided to entirely switch out the effect.

The original version PRC1 was designed to not quite reach the point of self-oscillation as this resulted in nasty clipping and the output amplitude increasing greatly. In this new version, careful application of signal limiting means that self-oscillation can now be achieved without the signal amplitude running out of control.

Typical Input / Output: typical bipolar +/- 5V.
The Dry path is DC coupled, but the Delay chip is AC coupled.
Width: 1 FracUnit
Current: +ve 45mA / -ve 20mA

Added on Wednesday 31 December, 2008.