Enclosure not stated · 3 knobs
Hudson Electronics BroadcastVerified
Based on the Hudson Electronics Broadcast· 6 other boards clone it
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
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×4 | 5K6 | 5.6k | read from the layout by eye | |
| ×2 | 1K | 1k | read from the layout by eye | |
| ×2 | 33K | 33k | read from the layout by eye | |
| ×1 | 220K | 220k | read from the layout by eye | |
| ×1 | 56K | 56k | read from the layout by eye | |
| ×1 | 4K7 | 4.7k | read from the layout by eye | |
| ×1 | 10R | 10 | read from the layout by eye | |
| ×1 | 68R | 68 | read from the layout by eye | |
| ×1 | 450R | 450 | read from the layout by eye | |
| ×1 | 15K | 15k | read from the layout by eye | |
| ×1 | ? | ? | LED resistor, value not given; read from the layout by eye | |
| Capacitors 6 | ||||
| ×1 | 330p | 330p | read from the layout by eye | |
| ×1 | 1n | 1n | read from the layout by eye | |
| ×1 | 330n | 330n | read from the layout by eye | |
| ×5 | 10u | 10u | electrolytic; read from the layout by eye | |
| ×7 | 100u | 100u | electrolytic; read from the layout by eye | |
| ×1 | 330u | 330u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×4 | 1N5817 | 1N5817 | D1-D4; read from the layout by eye | |
| D5 | 15V Zener | 15V | read from the layout by eye | |
| Transistors 2 | ||||
| ×1 | BC549C | BC549C | read from the layout by eye | |
| ×1 | OC71 | OC71 | germanium; read from the layout by eye | |
| ICs 1 | ||||
| ×1 | LT1054 | LT1054 | printed 1054; read from the layout by eye | |
| Transformers 1 | ||||
| ×1 | TY-141P | TY-141P | transformer on the board; read from the layout by eye | |
| Potentiometers 3 | ||||
| Gain Trim | A250K | A250k | Potentiometer | read from the layout by eye |
| Low Cut | A10K | A10k | Potentiometer | read from the layout by eye |
| Level | B25K | B25k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Gain | SPDT on/off/on | SPDT ON/OFF/ON | toggle; read from the layout by eye | |
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