1590BBM · 6 knobs

Beholder

Based on the Electronic Audio Experiments Beholder· 1 other board clones it

Category: Fuzz
Controls: Level · Fuzz · Filter · Dwell · Feedback · Drone Footswitch
Price: $12.00in stock

Buy the PCB at Electronic Audio Experiments Build document1

From the vendor

Do-it-yourself PCB for the discontinued Beholder reverb/fuzz. For more information about the original, visit the archived product page here. Includes a 3PDT daughterboard.

Schematic

The schematic is in the vendor's build document, page 10. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 64 rows

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Ref	Value	Normalized	Type
Resistors 26
R8	100k	100k	Metal film resistor, 1/4W 1%
R9	100k	100k	Metal film resistor, 1/4W 1%
R3	10k	10k	Metal film resistor, 1/4W 1%
R4	10k	10k	Metal film resistor, 1/4W 1%
R5	10k	10k	Metal film resistor, 1/4W 1%
R13	10k	10k	Metal film resistor, 1/4W 1%
R15	10k	10k	Metal film resistor, 1/4W 1%
R16	10k	10k	Metal film resistor, 1/4W 1%
R26	10k	10k	Metal film resistor, 1/4W 1%
R6	1k	1k	Metal film resistor, 1/4W 1%
R7	1k	1k	Metal film resistor, 1/4W 1%
R18	1k	1k	Metal film resistor, 1/4W 1%
R24	1k	1k	Metal film resistor, 1/4W 1%
R1	1M	1M	Metal film resistor, 1/4W 1%
R2	1M	1M	Metal film resistor, 1/4W 1%
R17	1M	1M	Metal film resistor, 1/4W 1%
R25	1M	1M	Metal film resistor, 1/4W 1%
R10	22k	22k	Metal film resistor, 1/4W 1%
R11	22k	22k	Metal film resistor, 1/4W 1%
R27	22k	22k	Metal film resistor, 1/4W 1%
CLR	4.7k	4.7k	Metal film resistor, 1/4W 1% (NOTE: Select CLR for de- sired LED intensity.)
R14	4.7k	4.7k	Metal film resistor, 1/4W 1% (NOTE: Select CLR for de- sired LED intensity.)
R19	4.7k	4.7k	Metal film resistor, 1/4W 1% (NOTE: Select CLR for de- sired LED intensity.)
R12	470	470	Metal film resistor, 1/4W 1%
R20	47k	47k	Metal film resistor, 1/4W 1%
R22	68k	68k	Metal film resistor, 1/4W 1%
Capacitors 18
C2	100nF	100n	Capacitor, box film 5mm lead spacing
C3	100nF	100n	Capacitor, box film 5mm lead spacing
C4	100nF	100n	Capacitor, box film 5mm lead spacing
C5	100nF	100n	Capacitor, box film 5mm lead spacing
C8	100nF	100n	Capacitor, box film 5mm lead spacing
C15	100nF	100n	Capacitor, box film 5mm lead spacing
C1	100µF	100u	Capacitor, electrolytic 25V
C11	100µF	100u	Capacitor, electrolytic 25V
C10	10nF	10n	Capacitor, box film 5mm lead spacing
C14	10nF	10n	Capacitor, box film 5mm lead spacing
C16	10nF	10n	Capacitor, box film 5mm lead spacing
C9	1µF	1u	Capacitor, box film 5mm lead spacing
C18	1µF	1u	Capacitor, box film 5mm lead spacing
C22	1µF	1u	Capacitor, box film 5mm lead spacing
C23	1µF	1u	Capacitor, box film 5mm lead spacing
C24	1µF	1u	Capacitor, box film 5mm lead spacing
C7	470pF	470p	Capacitor, MLCC NP0/C0G 5mm lead spacing
C13	47µF	47u	Capacitor, electrolytic 25V
Diodes 3
D1	1N5817	1N5817	Shottky Diode
D4	1N4148	1N4148	Silicon diode
D5	1N4148	1N4148	Silicon diode
Transistors 3
Q1	2N2222	2N2222	NPN BJT
Q2	2N2222	2N2222	NPN BJT
Q3	2N3904	2N3904	NPN BJT
ICs 4
IC1	TL072	TL072	Op Amp, JFET Input
IC2	TL072	TL072	Op Amp, JFET Input
IC3	BTDR-2H	BTDR-2H	Belton Brick (medium decay preferred, long also works)
REG1	78L05	78L05	5V regulator
Potentiometers 5
Dwell	A100k	A100k	16mm potentiometer, PCB mount right angle
Feedback	A100k	A100k	16mm potentiometer, PCB mount right angle
Volume	A100k	A100k	16mm potentiometer, PCB mount right angle
Tone	B50k	B50k	16mm potentiometer, PCB mount right angle
Fuzz	C1M	C1M	16mm potentiometer, PCB mount right angle
Trimmers 2
DRONETRIM	100k	100k	Bourns 3362P-1-104LF or equivalent
DRYMIX	100k	100k	Bourns 3362P-1-104LF or equivalent
Switches 2
Byp	3PDT	3PDT	3PDT Footswitch, solder lug
Drone	SPST	SPST	SPST Footswitch, momen- tary, normally open
LEDs 1
LED	LED	LED	5MM LED

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