aion BUSINESS CARD DRIVE User manual

BUSINESS CARD DRIVE 1
PROJECT NAME
BUSINESS CARD DRIVE
BASED ON
EFFECT TYPE
PROJECT SUMMARY
DOCUMENT VERSION
Lovepedal Eternity
A low-parts-count overdrive based on a stripped-down Tube Screamer, this circuit is the template for
many high-dollar boutique drive pedals.
Overdrive 1.0.0 (2019-04-11)
BUILD DIFFICULTY
Intermediate
Actual size is 2.3” x 1.3”.
https://aionelectronics.com
PCBs Kits Custom PCB Design
OVERVIEW
The Business Card Drive is a fully-functional overdrive effect disguised as a business card. It’s designed
to fit the same enclosure style as the new 125B projects, although since it doesn’t come with a bypass
PCB, the bypass footswitch and LED must be wired manually.
A full-sized project based on the Lovepedal Eternity will be released soon.
USAGE
• Tone controls the treble response of the effect. The center point (12:00) is flat. When turned to the
left, it cuts treble, and when turned to the right, it boosts treble.
• Drive controls the amount of gain in the op-amp feedback diode clipping stage.
• Volume controls the overall output of the effect.

BUSINESS CARD DRIVE 2
PARTS LIST
This parts list is also available in a spreadsheet format which can be imported directly into Mouser for
easy parts ordering. Mouser doesn’t carry all the parts (most notably potentiometers) so the second tab
lists all the non-Mouser parts as well as sources for each.
View parts list spreadsheet →
PART VALUE TYPE NOTES
R1 2M2 Metal film resistor, 1/4W
R2 1M Metal film resistor, 1/4W
R3 3k3 Metal film resistor, 1/4W
R4 20k Metal film resistor, 1/4W
R5 1k Metal film resistor, 1/4W
R6 10k Metal film resistor, 1/4W
R7 10k Metal film resistor, 1/4W
R8 1k Metal film resistor, 1/4W
R9 330R Metal film resistor, 1/4W
C1 47n Film capacitor, 7.2 x 2.5mm
C2 100n Film capacitor, 7.2 x 2.5mm
C3 47pF MLCC capacitor, NP0/C0G
C4 150n Film capacitor, 7.2 x 2.5mm
C5 1uF Film capacitor, 7.2 x 3.5mm
C6 220n Film capacitor, 7.2 x 2.5mm
C7 47uF Electrolytic capacitor, 5mm
C8 100uF Electrolytic capacitor, 6.3mm
D1 1N914 Fast-switching diode, DO-35
D2 1N914 Fast-switching diode, DO-35
D3 1N914 Fast-switching diode, DO-35
D4 1N914 Fast-switching diode, DO-35
LEDR 4k7 Metal film resistor, 1/4W LED current-limiting resistor. Adjust value to change LED brightness.
IC1 JRC4558D Operational amplifier, DIP8
IC1-S DIP-8 socket IC socket, DIP-8
DRIVE 500kB 16mm right-angle PCB mount pot
TONE 5kB 16mm right-angle PCB mount pot
VOL. 500kB 16mm right-angle PCB mount pot

BUSINESS CARD DRIVE 3
PARTS LIST, CONT.
PART VALUE TYPE NOTES
IN 1/4" stereo 1/4" phone jack, closed frame Switchcraft 112BX or equivalent.
OUT 1/4" mono 1/4" phone jack, closed frame Switchcraft 111X or equivalent.
DC 2.1mm DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent.
BATT Battery snap 9V battery snap Optional. Use the soft plastic type—the hard-shell type will not fit.
FSW 3PDT Stomp switch, 3PDT
ENC 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1.
BUILD NOTES
Son of Screamer variation
The parts list is for the Lovepedal Eternity, but the schematic is also identical to Jack Orman/AMZ’s
legendary “Son of Screamer” if you swap out a few parts. Here are the values to change if you want to
build a Son of Screamer.
• R2: 470k
• R3: 4.7k
• R4: 47k
• R9: 220R
• C2: 47n
• C4: 220n
• D2: jumper
• D4: jumper
• Tone: 20kW
• Volume: 10kB

SCHEMATIC
BUSINESS CARD DRIVE 4
GND
2M2
100uF
500kB
500kB
GND
5kB
VA
1M
JRC4558D
47n
VB
47pF
1N914
20k
100n
VB
3k3
1k
150n
JRC4558D
220n
330R
GND
GND
1k
1uF
GND
10k
10k
GND
47uF
GND
VA
GND
GND
VB
R1
C8
VOLUME
1
2
3
DRIVE
1
2
3
TONE
1
2
3
R2
2
3
1
IC1A
C1
C3
D1 D2
R4
C2
R3
R5
C4
6
5
7
IC1B
C6
R9
R8
C5
R6
R7
C7
84
IN
OUT
+V
GND
D3D4

BUSINESS CARD DRIVE 5
DRILL TEMPLATE
Cut out this drill template, fold the edges and tape it to the enclosure. Before drilling, it’s recommended
to first use a center punch for each of the holes to help guide the drill bit.
Ensure that this template is printed at 100% or “Actual Size”. You can double-check this by measuring
the scale on the printed page.
Top jack layout assumes the use of closed-frame jacks like the Switchcraft 111X. If you’d rather use
open-frame jacks, please refer to the Open-Frame Jack Drill Template for the top side.
LED hole drill size assumes the use of a 5mm LED bezel, available from several parts suppliers. Adjust
size accordingly if using something different, such as a 3mm bezel, a plastic bezel, or just a plain LED.
0 1 2
CM
0 1
INCH
x: -0.65, y: +1.71 x: 0.65, y: +1.71
ø9/32” ø9/32”
x: 0, y: +0.66
ø9/32”
x: 0, y: -1.20
ø15/32”
x: -0.775, y: -1.20
ø5/16”
CENTER (0,0)
125B
VOLUME DRIVE
TONE
FOOTSWITCHLED
ø3/8” ø1/2”
0.385”
0.625” 0.625”
ø3/8”
OUT DC IN

BUSINESS CARD DRIVE 6
ENCLOSURE LAYOUT
Enclosure is shown without jacks. See next page for jack layout and wiring.
125B

BUSINESS CARD DRIVE 7
WIRING DIAGRAM
125B
IN GND
+V GND
OUT +V
LEDR
Shown with optional 9V battery. If battery is omitted, both jacks can be mono rather than one being stereo.
Leave the far-right lug of the DC jack unconnected.

BUSINESS CARD DRIVE 8
LICENSE & USAGE
No direct support is offered for these projects beyond the provided documentation. It’s assumed
that you have at least some experience building pedals before starting one of these. Replacements and
refunds cannot be offered unless it can be shown that the circuit or documentation are in error.
All of these circuits have been tested in good faith in their base configurations. However, not all the
modifications or variations have necessarily been tested. These are offered only as suggestions based
on the experience and opinions of others.
Projects may be used for commercial endeavors in any quantity unless specifically noted. No
attribution is necessary, though a link back is always greatly appreciated. The only usage restrictions
are that (1) you cannot resell the PCB as part of a kit without prior arrangement, and (2) you cannot
“goop” the circuit, scratch off the screenprint, or otherwise obfuscate the circuit to disguise its source.
(In other words: you don’t have to go out of your way to advertise the fact that you use these PCBs, but
please don’t go out of your way to hide it. The guitar effects industry needs more transparency, not less!)
DOCUMENT REVISIONS
1.0.0 (2019-04-11)
Initial release.