License

Public Domain

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Marshall Lead 3005 12W Preamp

2 years ago 1777
  • Description
  • Documents
  • BOM
  • Attachments
  • Members
  • Comments

Description

A simple Preamp to use with the power Amp you like. Easy and Cheap, but very Useful and easy to Mod.

Documents

Sheet_1

Marshall Lead 12 w Mods

BOM

ID Name Designator Footprint Quantity
1 Low IN1 HDR-1X1/2.54 1
2 High IN2 HDR-1X1/2.54 1
3 330k R1 AXIAL-0.3 1
4 68k R2 AXIAL-0.3 1
5 33k R3 AXIAL-0.3 1
6 56k R7 AXIAL-0.3 1
7 10k R4,R6,R8 AXIAL-0.3 3
8 6k2 R5 AXIAL-0.3 1
9 82nF C1 CAP 0.2 IN 1
10 100pF C0,C5 RAD-0.1 2
11 220pF C2 RAD-0.1 1
12 10nF C3 CAP 0.2 IN 1
13 220R R9 AXIAL-0.3 1
14 220k R10 AXIAL-0.3 1
15 2,2uF C4 CAP-Z-5MMX5MM 1
16 8k2 R11 AXIAL-0.3 1
17 2k2 R12 AXIAL-0.3 1
18 2n2 C9 CAP 0.2 IN 1
19 12k R13 AXIAL-0.3 1
20 22nF C10 CAP 0.2 IN 1
21 100nF C11 CAP 0.2 IN 1
22 OUT P1 HDR-1X1/2.54 1
23 15k R14 AXIAL-0.3 1
24 Bright SW2 2 HOLES 1
25 Header-Male-2.54_1x1 +16V,-16V HDR-1X1/2.54 2
26 50k B TREBLE 3 HOLES 1
27 50k A BASS 3 HOLES 1
28 10k B MIDS 3 HOLES 1
29 1M A VOL 3 HOLES 1
30 22k B GAIN 3 HOLES 1
31 K2-1107ST-A4SW-06 SAT. 2 HOLES 1
32 1N4148W D1,D2,D3,D4,D5 DO-35G-F 5
33 204-10SURD/S530-A3 LED1 LED-3MM/2.54 1
34 Dual Opamp +Top OP DIP8 1
35 2PDT S2,S1 3 HOLES CHICO 2

Attachments

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Members

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Comments (2)

pauloscabeni Reply

Is there a way I can convert this circuit to be used with regular 9v DC supply? I've tried making a virtual ground with two 15k resistors to set the Vbias, then connecting R1, Gain Lug 2 and C3 (from your schematic) to Vbias, but it doesn't work. Thanks a lot for posting this schematic :)

Flaconsius Reply

@pauloscabeni @pauloscabeni Yes. Just make a Voltaje divider Power Supply. Every OpAmp-based Overdrive Pedal has one in the DC in. Check it everywhere. Good Luck.

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