Hudson - Electronic Broadcast

Sm4sh · Post by **Sm4sh** » 09 Nov 2019, 13:58

Hello!

I'm trying to make a pcb on Eagle for this pedal and I can't find the footprint for the transformer.
Does anybody have this ?

Thank you!

plush · Post by **plush** » 09 Nov 2019, 14:05

Sm4sh wrote:Hello!

I'm trying to make a pcb on Eagle for this pedal and I can't find the footprint for the transformer.
Does anybody have this ?

Thank you!

Hi,

You can get transformer's footprint from it's datasheet which is easily googlable.

turbofeedus · Post by **turbofeedus** » 29 Dec 2019, 02:53

Sm4sh wrote:Hello!

I'm trying to make a pcb on Eagle for this pedal and I can't find the footprint for the transformer.
Does anybody have this ?

Thank you!

Mouser had the footprint on the product page

Studio Ost · Post by **Studio Ost** » 24 Mar 2020, 10:07

Do you know if a 7660s charge pump will work or does it have to be the expensive lt1054?

Seiche · Post by **Seiche** » 24 Mar 2020, 15:24

7660s will work but you have to jumper pins 1 and 8 to geht the oscillator frequency out of the audible range.

Svullgo · Post by **Svullgo** » 14 Apr 2020, 20:43

Hi everyone!

Does anyone know what type and value the volume pots are in the Dual Broadcast?
B25K as the original one (and in johnk's schematic) or A100K as V1nce69's 24V Peach?

Take care!

Seiche · Post by **Seiche** » 16 Apr 2020, 04:38

teddeeh wrote:So i got my dual hudson in the post today
Here are images of the top and underside of the board.
If anyone wants to trace i will do my best to measure the parts or give readings etc.

maybe teddeeh can be so kind as to measure (or unscrew) the pots?

I thought the second switch just changes the pot but then they say "level high" and "level low", so maybe the switch simultaneously flips the gain as on the single version (which would make a lot of sense to have to volume pots, as the it gets way louder).

andy-h-h · Post by **andy-h-h** » 16 Apr 2020, 08:18

Seiche wrote:
teddeeh wrote:So i got my dual hudson in the post today
Here are images of the top and underside of the board.
If anyone wants to trace i will do my best to measure the parts or give readings etc.
maybe teddeeh can be so kind as to measure (or unscrew) the pots?

I thought the second switch just changes the pot but then they say "level high" and "level low", so maybe the switch simultaneously flips the gain as on the single version (which would make a lot of sense to have to volume pots, as the it gets way louder).

It does change the gain and swaps between the two volume pots at the same time. The value can be either 25 or 100k - probably won’t make much difference. I made one, but can’t remember what I put in it. Most likely the same as the 24v version as I prefer it over the 9v.

Seiche · Post by **Seiche** » 18 Apr 2020, 06:59

andy-h-h wrote:The value can be either 25 or 100k - probably won’t make much difference. I made one, but can’t remember what I put in it. Most likely the same as the 24v version as I prefer it over the 9v.

due to the LC filter that the volume pot and the transformer create, there will probably be a difference in brightness/treble response. Maybe this would be helpful as I find the pedal might brighter on the high gain setting.

andy-h-h · Post by **andy-h-h** » 18 Apr 2020, 21:00

Seiche wrote:
andy-h-h wrote:The value can be either 25 or 100k - probably won’t make much difference. I made one, but can’t remember what I put in it. Most likely the same as the 24v version as I prefer it over the 9v.
due to the LC filter that the volume pot and the transformer create, there will probably be a difference in brightness/treble response. Maybe this would be helpful as I find the pedal might brighter on the high gain setting.

True - I went a bit nuts and added a very light lowpass filter on the outputs. I've also removed the 33k resistor sitting across the legs of the transformer, as this also creates another filter with the transformer (which is probably covered earlier in this thread). I was having issues with loss of low frequencies, likely due to the fact that I was not using the same transformer. Either way, removing the 33k was helpful. I probably could have played with it until I found the right value for the transformer I have, but....

brejna · Post by **brejna** » 19 Apr 2020, 16:39

plush wrote:Hi!

I can verify V1nce69's work.

Would you share your layout?
Cheers

plush · Post by **plush** » 19 Apr 2020, 19:59

brejna wrote:
plush wrote:Hi!

I can verify V1nce69's work.
Would you share your layout?
Cheers

Hi

Nah, sorry, don't have it anymore.

Njebamin · Post by **Njebamin** » 19 May 2020, 08:28

Hi,

It always confuses me when pot tapers are labeled with letters since the standards differ.
Am I correct assuming 250k Log, 10k Log, 25k Lin? Just seems odd to me to have a linear level control, but maybe I'm missing something else.

Seiche · Post by **Seiche** » 19 May 2020, 09:38

A = audio = Log
B = Linear
C = reverse Audio = Antilog
W = weird

http://www.dirk-hendrik.com/temp/pottaper.gif

Njebamin · Post by **Njebamin** » 19 May 2020, 10:38

Seiche wrote: ↑19 May 2020, 09:38 W = weird

Thanks Seiche!

graybench · Post by **graybench** » 12 Dec 2021, 17:15

Hello all, just posted my video on the Hudson Broadcast dual version.
Quick couple things;
- I pulled out the Ge transistor, marked "2N404A" but likely a rebadge by NTE.
- hFE on the germ was 216, so much higher than what's usually recommended for this circuit (IMO, not going to be a huge difference either way)
- dual output volume pots are 250KB, not 25KB as is stated on the pedalPCB build sheet for their duocast.
Enjoy!

din_mentor · Post by **din_mentor** » 22 Nov 2022, 21:37

Hi,
Im a beginner when it comes to electronics.

Got both a single and a dual Hudson broadcast. Both built on veroboard.
The single sounds much fuller, the dual sounds flatter in transient response and less bass, which makes me wonder what's actually changed on the dual from the original. Ive heard the pretty much same conclusion stated in a comparison video on youtube, that the dual "has more mids".

Has anyone traced a dual and made a schematic? Ive only seen schematics of the single.

Is it confirmed that the single version has 25k vol and the dual has 250k vol pots?
Could this affect the tone in the way i mentioned?

Could the tone difference be from the way the dual vol pots are placed in parallel? Affects output impedance?

Also noticed that i get a bit more full sound when im on the low gain channel of the dual, and max out the high gain vol pot, compared to having it at min.

Jhaneyzz · Post by **Jhaneyzz** » 22 Nov 2022, 23:46

Do you hire tiny little elves to run your wires for you? holy crap that's clean...

din_mentor · Post by **din_mentor** » 22 Dec 2022, 21:25

So in conclusion:

volume pots variances
Single: 25k
Single 24V: 100k
Dual: 2x 250k

Quite strange that they are different values?

din_mentor · Post by **din_mentor** » 11 Jan 2023, 20:38

At this point i guess im just talking to myself

Well, an update:
After emailing Hudson, he claims that the single pedals uses 100k volumes, and the dual has 2x250k. Which makes sense as 250k in parallel comes as close as you can to 100k.

Opened my single broadcast and its 100k, not 25k!...But EVERY schematic online claims vol 25k, so somebody made a mistake, which was copied???

Hudson - Electronic Broadcast [traced]