Akashic Guitar effects PCB lookup
FILTERGAINVOLHUMSNG

Enclosure not stated · 5 knobs

From the vendor

A modified version of the the Lumpy’s Tone Shop 7 Series Lemon Drop Overdrive – An overdrive board based on a super rare 1960’s VOX 4&7 series amps that combined a tube power amp, a solid state preamp with a built-in fuzz circuit – craziness! Think Revolver and Led Zeppelin II and you’ve got it.

The board uses three controls (Volume, Filter & Drive). We’ve also added an optional extra trim pot on the board with an extra toggle – this allows you to set 2 different bias’ – one for single coil pickups, one for humbuckers. The board is REALLY responsive to your guitars volume control, you can back the drive of just by lowering the input from the guitar.

Biasing this board is easy, install all the components, flip to toggle so that the SNG Trimmer is engaged, and bias as per below – then flip the toggle so the HUM Trimmer is engaged adjust as needed. These are just what we found to be the sweet spots, you do you!

Suggest Bias:

With single pickup selected, bias drain on q2 voltage to: 4.84

With humbucker pickup selected, bias drain on q2 voltage to: 6+

Note: The toggle switch will need to be mounted externally, do not mount it on the board…otherwise you’ll have to externally mount the pots – it’s made this way to keep the board footprint smaller.

Check out the small clip below showing how close this little beauty can get to Paperback Writer…

https://www.five-cats-pedals.co.uk/wp-content/uploads/2021/08/Lemming-Drop-Sample-FiveCatsPedals.mp3

Schematic

The schematic is in the vendor's build document, page 1. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 29 rows

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Resistors 9
R61k1kR Axial DIN0207 L6.3mm D2.5mm P7.62mm Horizontal
R81k1kR Axial DIN0207 L6.3mm D2.5mm P7.62mm Horizontal
R710k10kR Axial DIN0207 L6.3mm D2.5mm P7.62mm Horizontal
R910k10kR Axial DIN0207 L6.3mm D2.5mm P7.62mm Horizontal
R11M1MR Axial DIN0207 L6.3mm D2.5mm P7.62mm Horizontal
R2100r100R Axial DIN0207 L6.3mm D2.5mm P7.62mm Horizontal
R3470k470kR Axial DIN0207 L6.3mm D2.5mm P7.62mm Horizontal
R447k47kR Axial DIN0207 L6.3mm D2.5mm P7.62mm Horizontal
R522k22kR Axial DIN0207 L6.3mm D2.5mm P7.62mm Horizontal
Capacitors 10
C52.2uf2.2uCP Radial D5.0mm P2.00mm
C82.2uf2.2uCP Radial D5.0mm P2.00mm
C147uf47uCP Radial D5.0mm P2.00mm
C34.7uf4.7uCP Radial D5.0mm P2.00mm
C622nf22nC Rect L7.0mm W2.0mm P5.00mm
C922nf22nC Rect L7.0mm W2.0mm P5.00mm
C24.7nf4.7nC Rect L7.0mm W2.0mm P5.00mm
C410pf10pC Rect L7.0mm W2.0mm P5.00mm
C7470pF470pC Rect L7.0mm W2.0mm P5.00mm
C103.3nf3.3nC Rect L7.0mm W2.0mm P5.00mm
Diodes 1
D11N58171N5817D DO-41 SOD81 P7.62mm Horizontal
Transistors 2
Q1BC108BC108TO-92 Inline Wide-large-solderpads
Q22N54572N5457TO-92 Inline Wide-large-solderpads
Potentiometers 5
Filter1A100KA100kPotentiometer Alpha just holes
Gain1A100KA100kPotentiometer Alpha just holes
Vol1A100KA100kPotentiometer Alpha just holes
HUM100k100k6mm-Trim-Pot
SNG100k100k6mm-Trim-Pot
Switches 1
SW1SW_SPDTSW_SPDTSPDT-Switch-Holes
Other 1
G***LOGOLOGOdomain