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Std EditionTesseract Guitar Practice Amp
License: CC-BY-NC-SA 3.0
The EasyEDA "Tesseract" DIY Guitar Practice Amplifier is an LM386 based low power amplifier designed to deliver up to about 500mW into an 8 Ohm speaker when run from a 9V battery.
Tesseract can be heard on YouTube here:
The design given here - which includes a complete PCB design and Bill of Materials - is highly flexible and allows the several options in both the build and use of the amplifier.
As well as a clipping circuit that some other designs - such as the more well known Smokey, Little Gem, Ruby and Noisy Cricket - have incorporated, Tesseract has several unique effects features designed into it:
Selectable Bipolar or Junction FET input stage for different input overload effects;
Adjustable gain and clipping 'hardness' in the Distortion stage;
An adjustable fullwave rectifier stage, driven by the distortion output, that generates a type of fuzz and frequency doubling effect called 'Wreckage';
An optional low frequency oscillator stage to sweep the Wreckage
effect;
A simple mixer to blend the 'Wrecked' and the 'Distortion' outputs;
Selectable, adjustable low or high frequency boost (a type of tone control);
An important aspect of the design is that all the features and FX can be tweaked for your delight and delectation.
Most features are also optional and can be wire linked out if not required without affecting the other functions.
The design could easily be modified to suit the LM380 2.5W or LM384 5W amplifier chips (although the Boost function would have to be omitted) or a range of other devices.
The design also includes a headphone output jack.
The PCB includes dual footprinting to simplify the choice of some of the components.
All parts (excluding the PCB) are available from: http://www.bitsbox.co.uk/ (Bitsbox can also supply suitable small switches, loudspeakers and battery holders or clips.) An alternative for J1 as an MPF102 is available from: http://www.tandyonline.co.uk/components/semiconductors/transistors/mpf102-jfet.html
Simulations of the different stages of this amplifier - and a copy of the EasyEDA LM386EE spice model used in them - can be found here:
https://easyeda.com/example/Tesseract_Guitar_Practice_Amp_simulation_files-H0ca8IFDB
To order Tesseract PCBs direct from EasyEDA
Sign up for a free account at:
then click on 'Fork' or 'Open in Editor' in the upper right of this page and then click on the Fabrication Output... button on the top toolbar of the PCB layout tab:
Then click on the Save To Cart button on the Add To Cart page:
Then follow the instructions on the
Home > My Account> Cart
page.
Orders can be tracked on the
Home > My Account> History Orders
page.
To download Gerbers for 3rd party PCB fabrication
Click on 'Open in Editor' in the upper right of this page and then click on the Fabrication Output... button on the top toolbar of the PCB layout tab:
Then click on the Download Gerber Files button on the Add To Cart page:
Tesseract Guitar Practice Amp Schematic
Open in editorTesseract Guitar Practice Amp PCB
Open in editorID | Name | Designator | Footprint | Quantity | Manufacturer Part | Mounted | Description |
---|---|---|---|---|---|---|---|
1 | 10k | R15,R14,R2,R7,R26,R24,R1 | RC07 | 7 | Various | Yes | 10k 250mW Metal Film 2% or better. |
2 | 51k | R12,R4,R5,R8,R27,R31,R21,R11 | RC07 | 8 | Various | Yes | 100k 250mW Metal Film 2% or better. |
3 | 100p | C9 | C_MLCC_RES_DIP_5.5X3MM_P5MM | 1 | Various | Yes | 100pF 16V ceramic capacitor. 5mm pitch resin dipped MLCC or similar. |
4 | 2N5458 | J1 | TO-92 | 1 | 2N5458 | Yes | 2N5458 N channel JFET in TO-92 package. |
5 | BC547 | Q1,Q2,Q3,Q4,Q5,Q6,Q7 | BC547 | 7 | BC547B | Yes | BC547 NPN BJT in TO-92 package. |
6 | 1Meg | R3,R17,R16,R32,R36,R37,R19 | RC07 | 7 | Various | Yes | 1M 250mW Metal Film 2% or better. |
7 | 1Meg_LOG | RV2,RV1 | POT_BITECH-TTE_P160KN | 2 | Various | Yes | 1M Log pot. PCB mount like: http://www.bitechnologies.com/pdfs/p160.pdf |
8 | 10p | C5 | C_MLCC_RES_DIP_5.5X3MM_P5MM | 1 | Various | Yes | 10pF 16V ceramic capacitor. 5mm pitch resin dipped MLCC or similar. |
9 | 100k | R6,R29,R28,R33,R30,R18,R9,R34,R35,R20 | RC07 | 10 | Various | Yes | 100k 250mW Metal Film 2% or better. |
10 | SWITCH_SPDT | SW2,SW3 | HDR1X3 | 2 | Just 3 off PTH | Yes | SPDT switch wired to holes in PCB. |
11 | 10k_LIN | RV4 | POT_BITECH-TTE_P160KN | 1 | Various | Yes | 10k Lin pot. PCB mount like: http://www.bitechnologies.com/pdfs/p160.pdf |
12 | BC557 | Q8 | BC557 | 1 | BC557B | Yes | BC557 PNP BJT in TO-92 package. |
13 | DNF_51k | R10 | RC07 | 1 | Various | Yes | DO NOT FIT IF SW2 AND LFO PARTS FITTED (10k 250mW Metal Film 2% or better.) |
14 | SWITCH_DPDT | SW1 | HDR1X6 | 1 | Just 6 off PTH. | Yes | DPDT switch wired to holes in PCB. |
15 | 47n | C17,C24,C8,C2,C18,C14 | C_MLCC_RES_DIP_5.5X3MM_P5MM | 6 | Various | Yes | 47nF 16V ceramic capacitor. 5mm pitch resin dipped MLCC or similar. |
16 | 10R | R22,R13,R25 | RC07 | 3 | Various | Yes | 10R 250mW Metal Film 2% or better. |
17 | 100k_LOG | RV6,RV7 | POT_BITECH-TTE_P160KN | 2 | Various | Yes | 100k Log pot. PCB mount like: http://www.bitechnologies.com/pdfs/p160.pdf |
18 | 22n | C19 | C_MLCC_RES_DIP_5.5X3MM_P5MM | 1 | Various | Yes | 22nF 16V ceramic capacitor. 5mm pitch resin dipped MLCC or similar. |
19 | 1u | C11,C16,C10,C22,C15,C7,C6,C4,C3,C1,C12,C26 | C_ALUNTANT_D6N9MM_P1.5-5MM | 12 | Various | Yes | 1uF 16V electrolytic capacitor. 5mm pitch resin dipped tantalum or 1.5mm to 2.5mm aluminium. |
20 | 220u | C20 | C_ALUNTANT_D6N9MM_P1.5-5MM | 1 | Various | Yes | 220uF 16V electrolytic capacitor. 5mm pitch resin dipped tantalum or 1.5mm to 2.5mm aluminium. |
21 | 47u | C21,C23,C13,C27,C28 | C_ALUNTANT_D6N9MM_P1.5-5MM | 5 | Various | Yes | 47uF 16V electrolytic capacitor. 5mm pitch resin dipped tantalum or 1.5mm to 2.5mm aluminium. |
22 | LED | D1 | LED3MM | 1 | Any 3mm lead spacing LED. (Almost any LED can be fitted if the leads are bent or wired to the PCB) | Yes | Red 3mm LED with approx 2V forward drop. |
23 | 10k_LOG | RV5,RV3 | POT_BITECH-TTE_P160KN | 2 | Various | Yes | 10k Log pot. PCB mount like: http://www.bitechnologies.com/pdfs/p160.pdf |
24 | 1k | R23,R38 | RC07 | 2 | Various | Yes | 1k 250mW Metal Film 2% or better. |
25 | SIP2 | P1,P2 | HDR1X2 | 2 | Just 2 off PTH | Yes | Wires can go straight to PCB. |
26 | LM386 | U2 | DIP08 | 1 | LM386N-3 | Yes | LM386 low power audio amplifier in 8 pin DIP package. |
27 | 6.35mm_switched_3_pole_jack_skt_w-mono_plug | SKT1 | 6.35MM_SWITCHED_3_POLE_JACK_SKT_NEUTRIK_NMJ6HFD2 | 1 | Neutrik NMJ6HFD2 or similar | Yes | 6.35mm switched 3 pole jack socket Neutrik NMJ6HFD2 showing use as power switch with mono plug. |
28 | 6.35mm_switched_3_pole_jack_skt_Neutrik_NMJ6HFD2 | SKT2 | 6.35MM_SWITCHED_3_POLE_JACK_SKT_NEUTRIK_NMJ6HFD2 | 1 | Neutrik NMJ6HFD2 or similar | Yes | 6.35mm switched 3 pole jack socket Neutrik NMJ6HFD2. |
29 | WIRE_LINK_or_SoT_CAP | C25 | C_MLCC_RES_DIP_5.5X3MM_P5MM | 1 | Various | Yes | Wire link or user choice of capacitor. |
30 | unplated_M3_clearance_hole | 3M5_H1,3M5_H2,3M5_H3,3M5_H4 | HOLE_3MM5 | 4 | n/a | Yes | You don't have to buy these: they come free with the PCB. |
31 | TL084N | U1,U3 | DIP14 | 2 | TL084CN | Yes | TL084 quad opamp in 14 pin DIP package. |
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