125B · 4 knobs

TempestAmp Distortion

Based on the Friedman BE-OD· 7 other boards clone it

Category: Distortion· Amp-Like Distortion
Controls: Gain · Volume · Presence · Tight
Difficulty: Intermediate
Price: $12.50in stock

Buy the PCB at Aion FX Build document1.0.1 (2019-03-08) Mouser parts list google

From the vendor

A pedal recreation of the Friedman BE-100 and Dirty Shirley amplifiers.

The Tempest Amp Distortion is a combination of the Friedman BE-OD and Dirty Shirley pedals, two very similar circuits that were designed to emulate high-gain amplifiers.

It’s not a true amp emulator of the sort that replace the tubes with JFETs, as Runoffgroove is famous for. Instead, it’s fully driven by op-amps, but very carefully designed in a way to mimic the response and character of a Friedman amplifier. And by all accounts it has succeeded, quickly becoming one of the most revered “amp in a box” pedals on the scene today.

The original Friedman BE-OD is missing a midrange control, while the Dirty Shirley has a midrange control but converts the Tight knob into a toggle switch. The Tempest project combines these together, preserving the midrange control while also leaving the Tight control as a knob instead of a switch, for a total of seven knobs.

Schematic

The schematic is in the vendor's build document, page 7. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 84 rows

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Ref	Value	Normalized	Type	Notes
Resistors 32
R1	330k	330k	Metal film resistor, 1/4W
R2	10k	10k	Metal film resistor, 1/4W
R3	22k	22k	Metal film resistor, 1/4W
R4	39k	39k	Metal film resistor, 1/4W
R5	4k7	4.7k	Metal film resistor, 1/4W
R6	10k	10k	Metal film resistor, 1/4W
R7	22k	22k	Metal film resistor, 1/4W
R8	22k	22k	Metal film resistor, 1/4W
R9	22k	22k	Metal film resistor, 1/4W
R10	220k	220k	Metal film resistor, 1/4W
R11	22k	22k	Metal film resistor, 1/4W
R12	27k	27k	Metal film resistor, 1/4W
R13	10k	10k	Metal film resistor, 1/4W
R14	2k2	2.2k	Metal film resistor, 1/4W
R15	33k	33k	Metal film resistor, 1/4W
R16	33k	33k	Metal film resistor, 1/4W
R17	2k2	2.2k	Metal film resistor, 1/4W
R18	470k	470k	Metal film resistor, 1/4W
R19	2k2	2.2k	Metal film resistor, 1/4W
R20	2k2	2.2k	Metal film resistor, 1/4W
R21	22k	22k	Metal film resistor, 1/4W
R22	100k	100k	Metal film resistor, 1/4W
R23	2k2	2.2k	Metal film resistor, 1/4W
R24	10R	10	Metal film resistor, 1/4W	Power supply filtering resistor.
R25	20k	20k	Metal film resistor, 1/4W
R26	22k	22k	Metal film resistor, 1/4W
R27	2k2	2.2k	Metal film resistor, 1/4W
R28	20k	20k	Metal film resistor, 1/4W
R29	22k	22k	Metal film resistor, 1/4W
R30	2k2	2.2k	Metal film resistor, 1/4W
RPD	2M2	2.2M	Metal film resistor, 1/4W	Input pulldown resistor. Can be as low as 1M.
LEDR	4k7	4.7k	Metal film resistor, 1/4W	LED current-limiting resistor. Adjust value to change LED brightness.
Capacitors 22
C1	22n	22n	Film capacitor, 7.2 x 2.5mm
C2	47pF	47p	MLCC capacitor, NP0/C0G
C3	10n	10n	Film capacitor, 7.2 x 2.5mm
C4	1n	1n	Film capacitor, 7.2 x 2.5mm
C5	47pF	47p	MLCC capacitor, NP0/C0G
C6	100n	100n	Film capacitor, 7.2 x 2.5mm
C7	47n	47n	Film capacitor, 7.2 x 2.5mm
C8	120pF	120p	MLCC capacitor, NP0/C0G
C9	220pF	220p	MLCC capacitor, NP0/C0G
C10	10n	10n	Film capacitor, 7.2 x 2.5mm
C11	4n7	4.7n	Film capacitor, 7.2 x 2.5mm
C12	22n	22n	Film capacitor, 7.2 x 2.5mm
C13	220n	220n	Film capacitor, 7.2 x 2.5mm
C14	2n2	2.2n	Film capacitor, 7.2 x 2.5mm
C15	10n	10n	Film capacitor, 7.2 x 2.5mm
C16	220n	220n	Film capacitor, 7.2 x 2.5mm
C17	100uF	100u	Electrolytic capacitor, 6.3mm	Power supply filter capacitor.
C18	100n	100n	MLCC capacitor, X7R	Power supply filter capacitor.
C19	22uF	22u	Electrolytic capacitor, 5mm	Reference voltage filter capacitor.
C20	100n	100n	MLCC capacitor, X7R	Reference voltage filter capacitor.
C21	22uF	22u	Electrolytic capacitor, 5mm	Reference voltage filter capacitor.
C22	100n	100n	MLCC capacitor, X7R	Reference voltage filter capacitor.
Diodes 9
D1	1N5817	1N5817	Schottky diode, DO-41
D2	3mm	3MM	LED, 3mm, red diffused
D3	3mm	3MM	LED, 3mm, red diffused
D4	1N914	1N914	Fast-switching diode, DO-35
D5	1N914	1N914	Fast-switching diode, DO-35
D6	1N914	1N914	Fast-switching diode, DO-35
D7	1N914	1N914	Fast-switching diode, DO-35
D8	3mm	3MM	LED, 3mm, red diffused
D9	3mm	3MM	LED, 3mm, red diffused
ICs 4
IC1	TL072	TL072	Operational amplifier, DIP8
IC2	TL072	TL072	Operational amplifier, DIP8
IC3	TL072	TL072	Operational amplifier, DIP8
IC4	TL072	TL072	Operational amplifier, DIP8
Potentiometers 6
BASS	100kC	C100k	16mm right-angle PCB mount pot
MID	100kC	C100k	16mm right-angle PCB mount pot
PRES.	10kC	C10k	16mm right-angle PCB mount pot
TIGHT	100kC	C100k	16mm right-angle PCB mount pot
GAIN	1MA	A1M	16mm right-angle PCB mount pot
VOL.	50kA	A50k	16mm right-angle PCB mount pot
Trimmers 1
TRIM	100k	100k	rimmer, 10%, 1/4”	Adjusts the overall gain range of the effect.
Switches 1
FSW	3PDT	3PDT	Stomp switch, 3PDT
LEDs 1
LED	5mm	5MM	LED, 5mm, red diffused
Jacks & sockets 7
IC1-S	DIP-8 socket	DIP-8 SOCKET	IC socket, DIP-8
IC2-S	DIP-8 socket	DIP-8 SOCKET	IC socket, DIP-8
IC3-S	DIP-8 socket	DIP-8 SOCKET	IC socket, DIP-8
IC4-S	DIP-8 socket	DIP-8 SOCKET	IC socket, DIP-8
IN	1/4" mono	1/4" MONO	1/4" phone jack, closed frame	Switchcraft 111X or equivalent.
OUT	1/4" mono	1/4" MONO	1/4" phone jack, closed frame	Switchcraft 111X or equivalent.
DC	2.1mm	2.1MM	DC jack, 2.1mm panel mount	Mouser 163-4302-E or equivalent.
Hardware 1
ENC	125B	125B	Enclosure, die-cast aluminum	Can also use a Hammond 1590N1.

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