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STD Marshall 2203 Amplifier
License: Public Domain
Mode: Schematic/Simulation
- 1
Update time：
2024-04-11 15:51:07
Creation time：
2024-03-18 14:00:55
Description
Another EasyEDA user asked me to try an build a MARSHALL 2203 Guitar Amplifier, BUT as a low wattage, single-ended guitar amplifier.
What I have done is kept the preamp circuit exactly as the 2203 (two 12AX7 Vacuum tubes, Hi and Low Inputs and Tone Control Circuit) , but made the output amplifier single-ended using a single EL84 Vacuum Tube and Elcor-USA Output Transformer.
Also, the 2203 has a built-in effects effects circuit board, but I have provided Send and Receive Jacks to add external effects!
The "Presence" control circuit can be omitted, as I am not sure it will work with a single-ended circuit.
CORRECTION: R17 and R18 should be 100 ohms (not 100K ohms!!!)
Unverified!
(NOTE: for some unknown reason, the pcb on my laptop will not render in 3D using EasyEDA. I contacted them, but it renders on their computers fine.)
Design Drawing
schematic diagram
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PCB
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| ID | Name | Designator | Footprint | Quantity | Contributor | JLCPCB Part Class | |
|---|---|---|---|---|---|---|---|
| 1 | L / N / E | AC_IN | TERMINAL_BLOCK_3P_5MM | 1 | SugarFoot Pedals | CON_TERMINAL_BLOCK_03-5MM | |
| 2 | KBP306G_C2764881 | BR1 | KBP_4P-L14.5-W3.5-P3.81-L | 1 | lcsc | KBP306G_C2764881 | |
| 3 | 22uf 100v | C1 | CAP-TH_BD8.0-P3.50-D0.6-FD | 1 | VibratoLLC | Electrolytic TH Med | |
| 4 | 680nF | C2 | CAPACITOR-RADIAL-5MM | 1 | lcsc | FK20X7R2A684KN006_C3697943-1 | |
| 5 | 22nF 400v | C3,C4 | FILM_CAP_15MMPITCH | 2 | lcsc | B32671L4223J000 | |
| 6 | 470pF | C5,C6 | CAPACITOR-RADIAL-5MM | 2 | lcsc | FK28C0G1H471J | |
| 7 | 1nF | C7 | CAPACITOR-RADIAL-5MM | 1 | lcsc | T07E3E102MA5B0S0N0 | |
| 8 | 470pF | C8 | CAPACITOR-RADIAL-5MM | 1 | LCSC | CT81-N5Y5P1B471KSEW | |
| 9 | 22nF | C9,C10 | CAPACITOR-RADIAL-5MM | 2 | lcsc | FK22C0G2J223JN006 | |
| 10 | 100uF 400v | C11,C12 | CAP-TH_BD16.0-P7.50-D1.2-FD | 2 | LCSC | 400BXW100MEFR16X30 | |
| 11 | 47uF 400v | C13 | CAP-TH_BD10.0-P5.00-D0.6-FD | 1 | lcsc | 400LXW47MEFR10X35 | |
| 12 | 100nF | C14,C15 | CAPACITOR-RADIAL-5MM | 2 | lcsc | FA26NP01H104JNU06 | |
| 13 | 100nF 400v | C16,C17 | FILM_CAP_15MMPITCH | 2 | lcsc | B32912A5104M000 | |
| 14 | 22nF | C18 | FILM_CAP_15MMPITCH | 1 | lcsc | FK22C0G2J223JN006 | |
| 15 | 4amps 5x20 | F1 | BRYCE-FUSE-M205-CLIPS | 1 | SugarFoot Pedals | FUSE-5X20-CLIPS | |
| 16 | 28L0138-70R-10 | FB1 | 28L0138-70R-10 | 1 | DangerousPrototype | 28L0138-70R-10 | |
| 17 | HI INPUT | J1 | NMJ4HCD2 | 1 | SugarFoot Pedals | 1/4 JACK MONOSW | |
| 18 | LOW INPUT | J2 | NMJ4HCD2 | 1 | SugarFoot Pedals | 1/4 JACK MONOSW | |
| 19 | SEND | J3 | NMJ4HCD2 | 1 | SugarFoot Pedals | 1/4 JACK MONOSW | |
| 20 | RETURN | J4 | NMJ4HCD2 | 1 | SugarFoot Pedals | 1/4 JACK MONOSW | |
| 21 | 1kΩ | R1 | 3WATT RESISTOR | 1 | lcsc | CR3W-1K±5%-9T73 | |
| 22 | 220Ω | R2 | 3WATT RESISTOR | 1 | lcsc | CR2W-220Ω±5%-9T73 | |
| 23 | 10kΩ | R3,R9,R24 | R_1/4W-R_1/4W | 3 | lcsc | CR1W-10K±5%-TT63 | |
| 24 | 100kΩ | R4,R5,R13,R14 | 3WATT RESISTOR | 4 | lcsc | CR3W-100K±5%-9T73 | |
| 25 | 68kΩ | R6 | R_1/4W-R_1/4W | 1 | lcsc | CR1W-68K±5%-TT63 | |
| 26 | 1MΩ | R7 | R_1/4W-R_1/4W | 1 | lcsc | CR1W-1M±5%-TT52 | |
| 27 | 2.7kΩ | R8 | R_1/4W-R_1/4W | 1 | lcsc | CR1W-2K2±5%-TT52 | |
| 28 | 470kΩ | R10,R11,R12 | R_1/4W-R_1/4W | 3 | lcsc | CR1W-470K±5%-TT52 | |
| 29 | 820Ω | R15 | R_1/4W-R_1/4W | 1 | lcsc | CR1W-820Ω±5%-TT63 | |
| 30 | 33kΩ | R16 | R_1/4W-R_1/4W | 1 | lcsc | CR1W-33K±5%-TT63 | |
| 31 | 100 | R17,R18 | 3WATT RESISTOR | 2 | lcsc | CR3W-100Ω±5%-9T73 | |
| 32 | 470kΩ | R19 | 3WATT RESISTOR | 1 | lcsc | CR3W-470K±5%-9T73 | |
| 33 | 10kΩ | R20,R21 | 3WATT RESISTOR | 2 | lcsc | CR3W-10K±5%-9T73 | |
| 34 | 100kΩ | R22 | 3WATT RESISTOR | 1 | lcsc | CR1W-100K±5%-TT52 | |
| 35 | 4.7kΩ | R23 | R_1/4W-R_1/4W | 1 | lcsc | CR1W-4K7±5%-TT63 | |
| 36 | 8 Ohm | SPKR1 | TERMINAL_BLOCK_2P_5MM | 1 | SugarFoot Pedals | CON_TERMINAL_BLOCK_02-5MM | |
| 37 | STANDBY SWITCH | SW1 | TERMINAL_BLOCK_2P_5MM | 1 | SugarFoot Pedals | CON_TERMINAL_BLOCK_02-5MM | |
| 38 | EDCOR_XPWR296 | T1 | XPWR296 | 1 | SugarFoot Pedals | EDCOR_XPWR296 | |
| 39 | 100 Hum Balance | TR1 | TRIMMER CT6EPXXXX | 1 | SugarFoot Pedals | Trimmer CT6EPXXXX | |
| 40 | EDCOR XSE10-5K-8 | TX1 | EDCOR_XSE10-5K-8 | 1 | SugarFoot Pedals | EDCOR XSE10-5K-8 | https://www.gnu.org/licenses/lgpl-2.1.html |
| 41 | 1Meg(Log)GAIN | VR1 | ALPHA-TH | 1 | SugarFoot Pedals | Potentiometer-TH_Verticle | |
| 42 | 250K(Lin)TREBLE | VR2 | ALPHA-TH | 1 | SugarFoot Pedals | Potentiometer-TH_Verticle | |
| 43 | 1Meg(Log)BASS | VR3 | ALPHA-TH | 1 | SugarFoot Pedals | Potentiometer-TH_Verticle | |
| 44 | 25K(Lin)MIDS | VR4 | ALPHA-TH | 1 | SugarFoot Pedals | Potentiometer-TH_Verticle | |
| 45 | 1Meg(Log)VOLUME | VR5 | ALPHA-TH | 1 | SugarFoot Pedals | Potentiometer-TH_Verticle | |
| 46 | 25K(Lin)PRESENCE | VR6 | ALPHA-TH | 1 | SugarFoot Pedals | Potentiometer-TH_Verticle | |
| 47 | 12AX7 | VT1,VT2 | 12AX7 - SOCKET - BELTON, 9 PIN, CRIMPED WITH SHIELD BASE, PC MOUNT | 2 | VibratoLLC | 12AX7 | |
| 48 | EL84 | VT3 | EL84 | 1 | SugarFoot Pedals | EL84_GRIDSNAP |
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