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STD UltraBeetle Guitar Preamp
UltraBeetle Guitar Preamp
License
Public Domain
License: Public DomainMode:
Mode
Schematic/SimulationSchematic/Simulation
Unlisted
- 1
Update time：
2024-11-15 14:15:24
Creation time：
2024-10-09 14:15:45
Description
Description
UltraBeetle PreAmp is a modification of the VOX Super Beatle preamp circuit, which was (according to Michael Nesmith) used to record the song "Pleasant Valley Sunday" by the Monkees!
The majority of the circuit is the same, but I added a relay to switch between the "Normal" and "Brilliant" channels.
I changed some component values to widen the tone range. As much as I wanted to update the Tone Stack circuit, I left it in it's mostly unorthodox state.
Circuit also uses my Buck Boost module (which is available in my Projects), in order to get the higher voltages from a +9vDC Input.
NOTE: The "Overdrive" circuit appears to be a variation of a ToneBender/FuzzFace circuit. Adjust Trimmer Resistor TR1 for 0.7v on Collector of Q3 and adjust TR2 for 4.5v on Collector of Q4 !
Circuit is Unverified.
Design Drawing
Design Drawing
schematic diagram
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PCB
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| ID | Name | Designator | Footprint | Quantity | |
|---|---|---|---|---|---|
| 1 | 0.1 | C1,C6,C14 | CAP POLY L10.5MM DIA0.5 | 3 | |
| 2 | 0.47 | C2,C12,C25 | CAP POLY L10.5MM DIA0.5 | 3 | |
| 3 | 470p | C5,C18 | CAP POLY L10.5MM DIA0.5 | 2 | |
| 4 | 100pf | C7 | CAP POLY L10.5MM DIA0.5 | 1 | |
| 5 | 0.22 | C10 | CAP POLY L10.5MM DIA0.5 | 1 | |
| 6 | 680pf | C11 | CAP POLY L10.5MM DIA0.5 | 1 | |
| 7 | 1uf | C13,C16,C19 | CAP POLY L10.5MM DIA0.5 | 3 | |
| 8 | .01 | C15 | CAP POLY L10.5MM DIA0.5 | 1 | |
| 9 | 6800pf | C20 | CAP POLY L10.5MM DIA0.5 | 1 | |
| 10 | .015 | C21 | CAP POLY L10.5MM DIA0.5 | 1 | |
| 11 | .033 | C22 | CAP POLY L10.5MM DIA0.5 | 1 | |
| 12 | 2200pf | C23 | CAP POLY L10.5MM DIA0.5 | 1 | |
| 13 | 1uf BP | C3,C17 | CAPACITOR BIPOLAR TH | 2 | |
| 14 | 2.2uf | C4 | CAP-TH_BD4.0-P1.50-D0.8-FD | 1 | C43798 |
| 15 | 47uf | C8 | CAP-TH_BD4.0-P1.50-D0.8-FD | 1 | C43798 |
| 16 | 10uF | C9,C26 | CAP-TH_BD4.0-P1.50-D0.8-FD | 2 | C43798 |
| 17 | 9v/gnd/2xVCC/-VCC | CN1 | HDR-4X1/2.54 | 1 | C124413 |
| 18 | 1N4007 | D1,D2 | 1N4007 | 2 | |
| 19 | DC JACK 2.1mm x 5.5mm | DC1 | DC_JACK_2.1MMX5.5MM | 1 | |
| 20 | Input | J1 | NMJ4HCD2_NEW | 1 | |
| 21 | Output | J2 | NMJ4HCD2_NEW | 1 | |
| 22 | 560mH ASPC80-564K-RC | L1 | IND-TH_BD5.0-L10.5-P14.50-D0.6 | 1 | C71586 |
| 23 | channel B | LED1 | LED5MM | 1 | |
| 24 | channel A | LED2 | LED5MM | 1 | |
| 25 | pwr | LED3 | LED5MM | 1 | |
| 26 | N_JFET | Q1,Q5 | JFET_TO92 | 2 | |
| 27 | 2N3906 | Q2,Q6 | TO-92-3_L4.9-W3.7-P1.27-L | 2 | C25836751 |
| 28 | 2N2222 | Q3,Q4 | TO-92-3_L4.9-W3.7-P1.27-L | 2 | C118536 |
| 29 | 2N3904 | Q8 | TO-92-3_L4.9-W3.7-P1.27-L | 1 | C118538 |
| 30 | 68K | R1,R19 | R_1/4W | 2 | |
| 31 | 1M | R2,R21 | R_1/4W | 2 | |
| 32 | 1K2 | R3,R20,R23 | R_1/4W | 3 | |
| 33 | 1K | R4,R15,R17 | R_1/4W | 3 | |
| 34 | 820 | R5 | R_1/4W | 1 | |
| 35 | 47 | R6 | R_1/4W | 1 | |
| 36 | 100 | R7,R24,R18 | R_1/4W | 3 | |
| 37 | 100K | R8,R9 | R_1/4W | 2 | |
| 38 | 10K | R10,R13,R27,R30,R31 | R_1/4W | 5 | |
| 39 | 150K | R11 | R_1/4W | 1 | |
| 40 | 4K7 | R12,R29 | R_1/4W | 2 | |
| 41 | 560 | R14 | R_1/4W | 1 | |
| 42 | 2K2 | R16 | R_1/4W | 1 | |
| 43 | 150 | R22 | R_1/4W | 1 | |
| 44 | RELAY | RLY1 | AXE_RELAY_KEMET_EC2-5NU | 1 | 80-EC2-5NU |
| 45 | 10K | TR1,TR2 | TRIMMER CT6EPXXXX | 2 | |
| 46 | 50KLin Treble | VR1 | ALPHA-TH | 1 | |
| 47 | 50KLog Bass | VR2,VR5 | ALPHA-TH | 2 | |
| 48 | 1KLin Treble | VR4 | ALPHA-TH | 1 | |
| 49 | TopBoost | SW1 | SW-TH_OS102011MA1QN1C | 1 | C221828 |
| 50 | Norm/OD | SW2 | SW-TH_OS102011MA1QN1C | 1 | C221828 |
| 51 | MidRangeBoostFX | SW3 | EG1313 | 1 | EG2485-ND |
| 52 | MidBoost | SW4 | SW-TH_OS102011MA1QN1C | 1 | C221828 |
| 53 | ChanSelect | SW5 | SW-TH_OS102011MA1QN1C | 1 | C221828 |
| 54 | 50KLog Volume | VR3,VR6 | ALPHA-TH | 2 |
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