Obsidius Preamp

Based on the Darkglass B3K· 1 other board clones it

Category: Preamp / Amp-in-a-box· Preamps
Controls: Level · Drive · Blend · Attack (Toggle Switch) · Grunt (Toggle Switch)
Price: $12.00in stock
Tags: 125B

From the vendor

Controls

• Level – Controls the overall output volume

• Drive – Controls amount of signal gain

• Blend – Controls the blend of clean / overdriven signal

• Attack (Toggle Switch) – Sets the amount of treble content (Cut / Flat / Boost)

• Grunt (Toggle Switch) – Sets the amount of pre-clipping low end content (Raw / Thin / Fat)

Specifications

• Designed for a 125B enclosure with top-mounted jacks

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

Ref	Value	Normalized
Resistors 32
R1	1M	1M
R2	1M	1M
R3	10K	10k
R4	100K	100k
R5	1M	1M
R6	3K3	3.3k
R7	1M	1M
R8	1M	1M
R9	200K	200k
R10	6K8	6.8k
R11	22K	22k
R12	470K	470k
R13	470K	470k
R14	1M	1M
R15	330K	330k
R16	3K3	3.3k
R17	6K8	6.8k
R18	470K	470k
R19	10K	10k
R20	1M	1M
R21	100K	100k
R22	33K	33k
R23	10K	10k
R24	22K	22k
R25	22K	22k
R26	47K	47k
R27	1K	1k
R28	100K	100k
R29	100R	100
R100	4K7	4.7k
R101	10K	10k
R102	10K	10k
Capacitors 25
C1	100n	100n
C2	1n	1n
C3	220n	220n
C4	22n	22n
C5	22n	22n
C6	22n	22n
C7	22n	22n
C8	220p	220p
C9	100n	100n
C10	22p	22p
C11	4n7	4.7n
C12	22n	22n
C13	220n	220n
C14	22p	22p
C15	1u	1u
C16	680p	680p
C17	22n	22n
C18	2n2	2.2n
C19	2n2	2.2n
C20	2n2	2.2n
C21	1n	1n
C22	1u	1u
C23	220n	220n
C100	100u	100u
C101	100u	100u
Diodes 3
D1	1N4148	1N4148
D2	1N4148	1N4148
D100	1N5817	1N5817
Transistors 2
Q1	J201	J201
Q2	J201	J201
ICs 4
IC1	TL072	TL072
IC2	CD4049UBE	CD4049UBE
IC3	TL072	TL072
IC4	TL072	TL072