Lithium Grim Heavenly Red Instruction Manual

Heavenly Red
Building instructions
v1.0

Heavenly Red v1.0
Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the
property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement
is implied.
2
Table of contents
PCB layout ............................................................................................................................................... 3
Components ............................................................................................................................................ 4
Power section.......................................................................................................................................... 5
Hardwire to 18V .................................................................................................................................. 5
9V only................................................................................................................................................. 5
Output buffer .......................................................................................................................................... 5
Build sequence ........................................................................................................................................ 5
Off board wiring ...................................................................................................................................... 6
Potentiometers.................................................................................................................................... 6
Switches............................................................................................................................................... 6
Plexi switch function ........................................................................................................................... 7
Biasing ..................................................................................................................................................... 8
Squealing ............................................................................................................................................. 8
Modifications........................................................................................................................................... 9
Structure.............................................................................................................................................. 9
Pre-EQ.................................................................................................................................................. 9
More Gain............................................................................................................................................ 9
Unity .................................................................................................................................................... 9
R15 vs R15a, R30 ................................................................................................................................. 9
Troubleshooting ...................................................................................................................................... 9
Schematic .............................................................................................................................................. 10
Read this entire manual thoroughly before you start building the effect! There are some available
options and you should choose which one you want to incorporate before starting your build.
Last update: 17-07-2019

Heavenly Red v1.0
Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the
property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement
is implied.
3
PCB layout
Dimensions: 100 mm x 49,5 mm
3.94 inch x 1.95 inch

Heavenly Red v1.0
Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the
property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement
is implied.
4
Components
Name
Value
Comment
Name
Value
Comment
C1
10u
Electrolytic 25V+
R1
390R
1% metalfilm
C2
10u
Electrolytic 25V+
R2
4k7
1% metalfilm
C3
100u
Electrolytic 25V+
R3
390R
1% metalfilm
C4
100n
SMF/MKT/Wima
R4
4k7
1% metalfilm
C5
10u
Electrolytic 25V+
R5
1M
1% metalfilm
C6
100u
Electrolytic 25V+
R6
68k
1% metalfilm
C7
4n7
SMF/MKT/Wima
R7
820R
1% metalfilm
C8
680n
SMF/MKT/Wima
R8
100R
1% metalfilm
C9
10u
Electrolytic 25V+
R9
499k
1% metalfilm
C10
1n
SMF/MKT/Wima
R10
499k
1% metalfilm
C11
470p
Wima/Silver Mica
R11
100k
1% metalfilm
C12
470p
Wima/Silver Mica
R12
4k75
1% metalfilm
C13
1n
SMF/MKT/Wima
R13
4k75
1% metalfilm
C14
2n2
SMF/MKT/Wima
R13a
18k
1% metalfilm
C15
1n
SMF/MKT/Wima
R14
499k
1% metalfilm
C16
2u2
Wima/Electrolytic 25V+
R15
NC
C16a
1u
Wima/Electrolytic 25V+
R15a
499k
1% metalfilm
C17
470p
Wima/Silver Mica
R16
499k
1% metalfilm
C18
470p
Wima/Silver Mica
R17
499k
1% metalfilm
C19
22n
SMF/MKT/Wima
R18
10k
1% metalfilm
C20
470p
Wima/MLCC
R19
100R
1% metalfilm
C21
470p
Wima/Silver Mica
R20
499k
1% metalfilm
C22
10u
Electrolytic 25V+
R21
470k
1% metalfilm
C23
22n
SMF/MKT/Wima OPTIONAL
R22
1k
1% metalfilm
C24
470p
Wima/Silver Mica
R23
100k
1% metalfilm
C25
22n
SMF/MKT/Wima
R24
100R
1% metalfilm
C26
22n
SMF/MKT/Wima
R25
33k
1% metalfilm
C27
3n3
SMF/MKT/Wima
R26
2M2
1% metalfilm
C28
100n
SMF/MKT/Wima
R27
2M2
1% metalfilm
C29
1u
SMF/MKT/Wima/Electrolytic
R28
10k
1% metalfilm
C30
100n
SMF/MKT/Wima
R29
100k
1% metalfilm
D1
LED
On/Off LED
R30
4M7
1% metalfilm
D2
1N4001
SW1
SPDT
Variac
D3
LED
Boost LED
SW2
SP3T
Pre-EQ on-off-on
D4
1N5817
SW4
DPDT
Boost Footswitch
D5
1N5817
SW5
SP3T
Structure on-off-on
P1
B500k
Gain
SW6
SPDT
Mode
P2
B250k
Treble
SW8
DPDT
Output buffer
P3
A1M
Bass
SW3
DPDT
Plexi
P4
B25k
Mid
VR1-6
100k
BIAS Trimpots
P5
B20k
Presence (Or B25k)
Q1-Q6
J201
IC1
LT1054
P6
A1M
Volume
All parts need to be 25V+ rated

Heavenly Red v1.0
Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the
property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement
is implied.
5
Power section
IC1can be either a LT1054 or a (cheaper) ICL7660S.
I do not advise the use of a battery in this build as the charge pumps will do strange things when the
battery is depleted. This is why it is also left out in the off board wiring section.
If you want to leave out the Variac switch, you will need to do the following.
Hardwire to 18V
If you connect pads 2 to pad 3 with a jumper on SW1, you will feed the effect with 18V.
Pads are marked like this:
9V only
For this you can leave out C5, D4, D5, IC1. Add a jumper between pad 1 and 2 on SW1
Output buffer
I added a simple optional buffer (as designed by AMZ) in case you need it. I suggest you do not add it
until you are in need of one, eg. when the pedal does not play nice with the other effects. To leave
out the buffer, leave out Q6, C28, C29, C30, R26, R27, R28, R29. Solder a jumper between the
bottom 2 pins on SW8. You can easily remove it if you decide to add the buffer.
Build sequence
Before starting with this section, make sure you have read the modifications section first!
Soldering this board can be very complicated for some people since the solder pads are very close
together. Use a magnifying glass to make the job easier.
The trick to soldering a PCB is to work from small to big components. My building sequence
suggestions in this section are based on the parts I used myself. Sometimes some components are
smaller (or bigger) so always use your own common sense and change the order accordingly. Usually
capacitors can differ a lot in size depending on their rating and value.
Note: Do not blow on your solder in an attempt to cool it down. That can result in a bad join that
might corrode! Also take extra care not to short components.
Start by soldering the resistors and jumpers (if applicable). If needed you can create a jumper using a
spare piece of lead from a resistor or diode. Next come the diodes (not the LEDs).
If you want to experiment with other transistors then you could socket them instead of soldering
them to the board. You’ll need a some 20 SIL sockets, break off the sockets and solder them to the
board. Now is the time to solder these sockets on the PCB as well as the socket for the IC. Place the
transistors and IC once you are finished with all soldering and off board wiring!
3
2
1

Heavenly Red v1.0
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property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement
is implied.
6
Now continue by soldering the MLCC, small SMF/MKT/Wima capacitors then solder the internal trim
pots (VR1-VR4). Now finish by soldering the transistors (if not socketed), the bigger MKT/WIMA and
the electrolytic capacitors.
I suggest you now drill the holes in your enclosure so you can use it during the off board wiring. This
PCB is very sensitive to noise! Keep the wires as short as possible and/or use shielding on the input
and output.
Besides the components mentioned in the components table, you will need:
•2 mono input jacks.
•2,1mm DC jack (isolated).
•22 gage stranded hook-up wire.
•2 x LED holders. This enables you to mount the LEDs in the enclosure.
•2 x Footswitch 3PDT (9 pins)
•Hammond 1590XX case (or similar) in your favorite color. You can of course experiment
with other enclosures, but measure twice before you start drilling!
Off board wiring
Potentiometers
In the pictures below you see the correct pin numbering of the pots (Alpha 16mm style).
Solder the wires accordingly and it is always a good idea to twist the wires together to create some
extra shielding against external noise. The rectangle pad marks pin 1.
You can break off the pin I marked with the yellow circle with a small pair of pliers.
Switches
The wiring for the switches is the same as for potentiometers, marking pin 1 with a rectangle pad.
SW3 and SW7 form a DPDT, so do not use 2 separate SPDT switches.
There is a small silkscreen error with the boost switch. Where it is marked as “On”, it should be “Off”,
so the switch is marked in reverse.
3 2 1

Heavenly Red v1.0
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property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement
is implied.
7
Ring
Sleeve
Tip
Cathode (short leg)
Input
Anode (long leg)
Cathode (short leg)
Anode (long leg)
Tip
Sleeve
Output
Boost
On/Bypass
The LED switching is made as described by AMZ’s anti Led pop setup. No need for an external LED
current limiting resistor. Keep cables as short as possible to prevent interference!
Plexi switch function
When engaging the Plexi switch (SW3&7) the Mode switch (SW6), Boost switch (SW4) and Structure
switch (SW5) get disabled because the Plexi mode bypasses Q2 and Q3.

Heavenly Red v1.0
Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the
property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement
is implied.
8
Biasing
Biasing this effect is very difficult. Start by setting the following switches:
•Variac +9V
•Boost Off
•Red Channel
•Plexi Off
•Structure Off
•Buffer Off
•Pre-EQ to taste
Set the pots as follows:
•Max Gain
•Volume 90%
•Presence 90%
•Bass, Middle, Treble 50%
With a digital multimeter measure the Voltage at the drain of Q4. Turn VR4 so it is at ½ of the input
voltage from your wall wart. Usually that is about 4,5V. Now do the same with Q3 and VR3, Q2 and
VR2, Q1 and VR1. Now you have your effect set to a good starting point from which you can
experiment with alternate settings. This is best done by ear.
Take your time and hear what the effect is of turning the different BIAS pots (VR1-VR4) on the sound.
Now turn on the Structure and see if it still sounds ok. If not, adjust the settings. Turn the structure
off and boost on and check it again. Adjust if necessary. Finally turn both boost and structure on.
Chances are it will squeal like a pig. This is not specific to this build and you can try to find a better
setting by turning the bias pots and keep wiring as short and/or shielded as possible.
Squealing
First of all, the effect will surely start squealing like a pig at max gain, max volume, structure and
boost on. If you can build/have a small audioprobe, check the drain on Q4. That is the spot where the
squeal will originate from.
To tame the beast, first try to lower the volume to 75%. Unity should be around 50% so you do not
need to worry it will not reach unity. Secondly you can lower the presence a bit. If it still is not in a
workable range for you, there is an extra capacitor added to the board C23. Experiment with values
between 10n and 47n. However, higher values will come at the cost of loss in gain.
Also always double check your soldering, especially with ground pads. Keep wires as short as
possible.
Lastly you can try to rebias the transistors to stop squealing. As said before take your time to find out
what works and what not. Changing one thing may also have an effect on other settings, especially
when it comes to biasing!

Heavenly Red v1.0
Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the
property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement
is implied.
9
Modifications
Structure
The original only has a structure on-off. In this version I added an extra option for a second structure
option formed by C16a and R13a. After some experimenting I found the 1uF/15k combination to
have some added value, but feel free to experiment and let me know if you found a good
combination.
Pre-EQ
The original Bogner amp has the pre EQ set to switch between 470p and 4n7. The 7th heaven effect
(GoosoniqueWorx) uses a 1n (C10) which I personally prefer. But you can choose any value between
100p –6n8 for C10 or C11.
More Gain
Upping P1 to B1M and changing R21 to 1M will increase the maximum amount of gain. However be
warned that the risk of squealing will also increase.
Unity
Replacing R23 with a 10k is reported to put unity gain closer to 50% on the volume knob
R15 vs R15a, R30
The Bogner amp has R15 and not R15a. The latter one was introduced in the 7th heaven although it is
not clear why, could have something to do with the squealing. Also R30 is in the Amps, but not in the
7th heaven.
Troubleshooting
All PCB’s have been 100% factory e-tested and out of every batch I receive I build an effect to double
check, so there should not be a connection problem on the PCB itself.
The board is not working (at all), what now?
•Check if your 9V is plugged in correctly (and/or soldered correctly on the board). Pay special
attention to the polarity.
•Check that you oriented the capacitors, IC’s ,transistors and diodes the right way. SMF, MKT
and ceramic capacitors as well as resistors do not need to be oriented. A likely sign of
incorrect capacitors and/or orientation is when an effect is sputtering, rumbling or
“motorboating”.
•Check if you used the correct values of the components. For resistors you can look here:
http://www.diyaudioandvideo.com/Electronics/Color/
•Double and triple check your soldering! A loose or cold solder can be really bad for your
board.
•Replace the IC and/or transistors, one might be defective. Before doing that first unplug the
9V and wait for 5 seconds.
•Check that you have good/high grade components. A lot of Chinese sourced parts are fakes
(especially high end opamps, audio capacitors, vintage diodes and transistors) so be careful
that you source your parts from reliable suppliers.

Heavenly Red v1.0
Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the
property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement
is implied.
10
Schematic