Description
The Deep Blue Delay (DBD) is Mad Professor’s answer to players who want tape-echo character without the upkeep. This PCB build keeps the same tone and spec as the hand-wired version, just at a friendlier price point. Its direct signal path runs through unfiltered analog amplifiers, so your dry tone stays clean and uncolored as long as you keep input levels below the maximum threshold—no noise-reduction circuitry stepping in to strip the natural decay of your repeats.
Where the DBD earns its place on a board is versatility around gain stages. Run it in front of a distortion pedal and the tuned filtering on the echo signal keeps repeats from turning to mush even at extreme settings—something a lot of delays can’t handle. Put it after distortion, or use it on a clean channel, and the extra headroom makes the repeat formation even more forgiving. Delay time and repeats were voiced specifically so you don’t have to nail tempo-matched settings; the tuned response sounds musical even when it’s off the beat, much like a vintage tape unit.
Controls are kept deliberately simple: Delay Time, Delay Level, and Repeat—nothing to overthink, just dial in ambience. The enclosure measures a board-friendly 69mm x 111mm x 50mm (W x L x H, including jacks and knobs).
- Delay time: approx. 25ms to 450ms
- Signal to noise ratio: 80dB
- Input impedance: 180K Ohms / Output drive: 10K Ohms
- Max input voltage: 2V peak, 650mV rms
- Current draw: 25-32mA depending on setting
- Voltage range: 8V-15V (below 7.5V, signal mutes)
- 1/4″ Switchcraft I/O, 2.1mm power jack
- True bypass with grounded input when bypassed
Includes two 6″ patch cables for quick pedalboard hookup.
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