Akashic Guitar effects circuit lookup
GAIN TRIMLOW CUTLEVEL

Enclosure not stated · 3 knobs

Tagboard Effects

Hudson Electronics BroadcastVerified

Based on the Hudson Electronics Broadcast· 6 other boards clone it

Category
Overdrive
Controls
Gain Trim · Low Cut · Level
Difficulty
Medium
Build
Vero· 21×18· 29 cuts, 14 links
Layout
Verified · Tagboard Effects marks it as built and working
Tags
Broadcast, Hudson, Overdrive

From the post

Original info:

The Broadcast is a transformer coupled, discrete Class-A germanium pre-amplifier based on the classic broadcast consoles of the 1960s. In the low-gain setting, the Broadcast can cover everything from sparkling clean boost through to transparent overdrive, all with a healthy dose of volume available to push your amp. The Broadcast features a specially selected Triad steel-core transformer and a NOS germanium transistor. Advancing the gain on the Broadcast starts to saturate the transformer and the pedal’s discrete circuitry, giving rise to a gentle and dynamic compression coupled with subtle thickening of the midrange. With the gain switch in the high setting and the trim control wound up, the Broadcast starts to deliver heavier distorted sounds with a warm and fuzzy edge to them. The Broadcast covers a wide range of driven and distorted tones whilst remaining dynamic, responding well to pick attack and the subtle nuances of every player.

Thanks to Tipunk777 for reverse-engineering his own pedal in the Forum section.

There are 2 layouts:

one with a 24V charge pump and one without.

23/12/2016 Layout updated! Changed Gain Switch to On-Off-On and rotated OC71 180 degrees

Added a second layout with charge pump. It's the same as before but on the top of the layout to give more space to the transformer.

Schematic

This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.

Parts list 27 rows

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Check before you build · 1 value the reader of this layout was not sure of
  • 450R at the left edge beside Sw 2 / Sw 3: printed clearly, unusual value
RefValueNormalizedTypeNotes
Resistors 11
×45K65.6kread from the layout by eye
×21K1kread from the layout by eye
×233K33kread from the layout by eye
×1220K220kread from the layout by eye
×156K56kread from the layout by eye
×14K74.7kread from the layout by eye
×110R10read from the layout by eye
×168R68read from the layout by eye
×1450R450read from the layout by eye
×115K15kread from the layout by eye
×1??LED resistor, value not given; read from the layout by eye
Capacitors 6
×1330p330pread from the layout by eye
×11n1nread from the layout by eye
×1330n330nread from the layout by eye
×510u10uelectrolytic; read from the layout by eye
×7100u100uelectrolytic; read from the layout by eye
×1330u330uelectrolytic; read from the layout by eye
Diodes 2
×41N58171N5817D1-D4; read from the layout by eye
D515V Zener15Vread from the layout by eye
Transistors 2
×1BC549CBC549Cread from the layout by eye
×1OC71OC71germanium; read from the layout by eye
ICs 1
×1LT1054LT1054printed 1054; read from the layout by eye
Transformers 1
×1TY-141PTY-141Ptransformer on the board; read from the layout by eye
Potentiometers 3
Gain TrimA250KA250kPotentiometerread from the layout by eye
Low CutA10KA10kPotentiometerread from the layout by eye
LevelB25KB25kPotentiometerread from the layout by eye
Switches 1
GainSPDT on/off/onSPDT ON/OFF/ONtoggle; read from the layout by eye

Other boards based on the Hudson Electronics Broadcast