Dual Delay

Dual Delay with analog controls and crossfade mixer

The Dual Delay is an effects unit for Eurorack. Analog controls mean it always sounds unique. Digital backing makes it reliable and compact. The circuit uses two PT2399, two opamp crossfaders and SMT 0805 construction.

At high values of the feedback knobs it goes into a chaotic self-oscillation, trimmed by the LEDs, so your LED choice will impact that character.

Two independent digital delay units, a switch to mix the inputs together, and a dual crossfader circuit letting you pan between dry/wet and the A/B circuits.

Just 24mm deep, 12HP wide.

Power draw is 20 mA on the -12V, and either 50 or 80 mA on the +12V depending on the style of 5V source you use. The linear 7805 is cheap and quiet, but gets warm, and 80 mA might be too much for your tastes, so kits include a 7805 drop-in switcher by Recom so the whole unit comes down to 50 mA on the +12V rail.

https://karltron.com/dual-delay/