GuitarPCB SuperDrive 70's User manual

SuperDrive 70’s
Board Dimensions (W x H) 3.7” x 1.5” ca. 9 mm x 38 mm
A fantastic all in one combo pedal that fits easily in a 1590DD and can be slipped into a Gig Bag and
taken anywhere to sound fantastic on any rig. Recreate tones produced by Jimmy Page, the Rolling
Stones, Jimi Hendrix, Eric Clapton, David Gilmour, Stevie Ray Vaughan and Eric Johnson, all in one box.
This board provides the best variety of playable sounds from the 70's and beyond.
The smooth fuzz portion uses easy to find transistors. The dynamics can be controlled by pick attack
using the guitar's volume control. The Overdrive section of this pedal provides a warm Marshall™
style tube crunch. The Boost section is provided by our famous Stage 3 Booster which will provide
clean, usable Boost especially for those long cable runs.
R1 1M R16 47k C1 47n IC1 JRC4558
R2 1M R17 10k C2 220n
R3 1M R18 1k* C3 150n Q1 – Q4 2N5089
R4 1k R19 10k C4 220n Q5 J113
R5 10k R20 10k C5 220n
R6 1k R21 10k C6 10n D1 – D4 1N914
R7 330R R22 2k2 C7 10µ D5 – D7 LED
R8 1k R23 2k2 C8 100n
R9 2k2 R24 33k C9 47µ GAIN 1 500k Lin
R10 150k R25 1M C10 100n TONE 1 5k Lin
R11 22k R26 1k C11 8n2 VOL 1 500k Log
R12 10k R27 2k2 C12 100n GAIN 2 1k Lin
R13 1k C13 22µ TONE 2 50k Lin
R14 10k TR1 3k* C14 22n VOL 2 100k Log
R15 100R TR2 10k C15 220n VOL 2 100k Log
C16 47µ
SW1 – SW2 SPST

Build Notes:
●TR1 / R18 – either the trim pot or fixed resistor is used but not both. When using TR1 the trim
pot should be set so that the voltage reading at the collector of Q3 is approximately .2V.
●IC1 –We suggest a JRC4 8 but there are plenty of pin-compatible replacements that would fit
in here- TL072, NE 32, JRC4 9, OPA2134 etc. If you socket, you can try different op amps.
●D1 – D –1N914 (1N4148 will do equally well). LED, germanium or combinations of both can be
tried. To make wiring your own unique clipping diode combinations easier we added A and B
pads to the circuit board so that diodes D1 – D4, along with any switching arrangement, would
be installed on a daughter board like our RotoTone or DPDT daughterboards which would then
be connected to pads A and B. See Main Wiring Diagram. A & B pads are left alone if not used.
●TR2 – should be initially set so that the voltage reading on the drain of Q is .5V - 5v. We
suggest using J113 for a clean boost however a good mod idea to add more grit is to try 2N 4 7
or J201 respectively. Simply place your DMM’s Black Probe on any Ground and place the Red
Probe on the Drain lead while turning TR2 (10k) till you can dial in the desired voltage.
●C7 in conjunction with SW1 will add a Bass Boost to the Fuzz circuit. If you do not require a
Bass Boost for the Fuzz section then simply do not install C7 or SW1.
●C15 allows more low Bass frequency to pass through. Allowing you to tighten up your tone
when not selected. If you do not want to use this feature then simply do not install C15 or SW2.
We highly recommend using (3) of GuitarPCB’s 3PDT Standard or Vari-Brite Boards for this project so
you will have much less wiring and be able to mount LEDs directly to the 3PDT Wiring Boards. In this
case R9, R23, R27 and the three Status LEDs, D5 – D7 should not be installed.
You may still wire it without using our Wiring Boards in which case populate the board using the CLR
resistors R9, R23 and R27 as well connecting the Status LEDs D5, D6 and D7 to the Main Board. Be sure
to place the Cathode Lead into the White Shaded Pad. You will also need to wire S1 & S15 to the DRIVE
footswitch, S2 & S25 to the FUZZ footswitch and S3 & S35 to the BOOST footswitch.
This image is High Resolution. Zoom in to see resistor color bands and values.

Be sure your In/Out Jack wiring is correct. A Stereo Jack (for battery
use only) has a RING lug which is used to connect to the battery
ground. If you do not intend to use a battery there is no need for a
Stereo Jack. If using Stereo then only use the Tip and Sleeve lugs.
Diagram for wiring Standard LEDs to Main Board. Be sure to place the Cathode Lead into the White
Shaded Pad. You will also need to wire S1 & S15 to the DRIVE footswitch, S2 & S25 to the FUZZ
footswitch and S3 & S35 to the BOOST footswitch.

Enjoy this free sample enclosure art. 1590DD size enclosure.
Need a kit?
USA – Check out PedalPartsAndKits for all your needs.
Europe – Das Musikding carries both boards and kits as a service to our Europeans friends.
Australia - PedalPartsAustralia.com carries GuitarPCB Boards and Kits direct.
If they do not have a KIT listed send them a note asking if they can help you out.
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Tonmann. Schematic and PCB design by Bruce R. and Barry. Build Document by Bruce R and Barry.
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