Enclosure not stated · 3 knobs

Deep Blue Delay

Based on the Mad Professor Deep Blue Delay· 12 other boards clone it

Category: Delay
Controls: Level · Repeat · Delay
Price: see vendorin stock
Tags: Mad Professor, Mad Professor, Deep Blue Delay, Delay, Echo, PT2399

Order the board at PCBWay Schematic image (CC BY-SA)

From the vendor

The Mad Professor Deep Blue Delay is a natural sounding digital / analog delay, with an analog direct signal path and has about the same bandwidth as the classic tape echo units which can be used in front of an amplifier or in amplifier effects loops. Since there are no noise reduction circuits it keeps decay of echoes as natural as possible also the signal has a tuned filtering to allow extreme settings without any interference. Furthermore: the delay is specially designed to work well with distorted tone, as this is the most critical application, where delays often fail! You can use the pedal before or after distortion. As such, it will work exceptionally well on clean sounds where requirements are less stringent, especially in terms of echo bandwidth and repeat formation.

Schematic

The schematic image is on the project page. Open it at PCBWay.

Parts list 31 rows

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Check before you build · 2 values the reader of this schematic was not sure of

input resistor 180k (image only 334 px wide)
5k1, 2k, 15n and the two 4n7 read from very small text

Ref	Value	Normalized	Type	Notes
Resistors 13
×7	10k	10k		read from the schematic by eye
×2	1k	1k		read from the schematic by eye
×2	20k	20k		read from the schematic by eye
×1	47	47		power input series resistor; read from the schematic by eye
×1	4k7	4.7k		LED resistor; read from the schematic by eye
×1	1M	1M		read from the schematic by eye
×1	180k	180k		input resistor; tiny text, could be 100k or 150k; read from the schematic by eye
×1	360k	360k		read from the schematic by eye
×1	22k	22k		read from the schematic by eye
×1	12k	12k		read from the schematic by eye
×1	5k1	5.1k		read from the schematic by eye
×1	2k	2k		read from the schematic by eye
×1	2k2	2.2k		PT2399 pin 6, in series with the Delay pot; read from the schematic by eye
Capacitors 11
×4	1u	1u		read from the schematic by eye
×4	100n	100n		read from the schematic by eye
×3	47u	47u		electrolytic; VB filter and PT2399 pins 1 and 2; read from the schematic by eye
×2	22n	22n		read from the schematic by eye
×2	4n7	4.7n		read from the schematic by eye
×2	2n2	2.2n		read from the schematic by eye
×1	47p	47p		read from the schematic by eye
×1	100p	100p		read from the schematic by eye
×1	10n	10n		read from the schematic by eye
×1	15n	15n		read from the schematic by eye
×1	100u	100u		electrolytic; read from the schematic by eye
Diodes 1
×1	1N4001	1N4001		reverse polarity; read from the schematic by eye
ICs 3
×1	TL072	TL072		two sections of one dual op-amp; read from the schematic by eye
×1	PT2399	PT2399		echo processor; read from the schematic by eye
×1	78L05	78L05		5 V regulator; read from the schematic by eye
Potentiometers 3
Level	B50k	B50k	Potentiometer	read from the schematic by eye
Repeat	B50k	B50k	Potentiometer	read from the schematic by eye
Delay	B50k	B50k	Potentiometer	wired as a variable resistor on pin 6; read from the schematic by eye

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