Hudson Electronic Broadcast

classic Classic list List threaded Threaded
70 messages Options
1234
Reply | Threaded
Open this post in threaded view
|

Re: Hudson Electronic Broadcast

Neil mcNasty
The layout image is way too small to be readable...
Reply | Threaded
Open this post in threaded view
|

Re: Hudson Electronic Broadcast

Vin69Nik
I also noticed... I’m not at home now and will post a bigger image
or a pdf later
Reply | Threaded
Open this post in threaded view
|

Re: Hudson Electronic Broadcast

BetterOffShred
In reply to this post by Vin69Nik
Is there a higher resolution image of your layout available ?  I built one of these recently but something seems off and I was interested in your effort.  Thanks for sharing it
Reply | Threaded
Open this post in threaded view
|

Re: Hudson Electronic Broadcast

Neil mcNasty
In reply to this post by Vin69Nik
Cool!
Thanks for your contribution!
Will build this soon...
Reply | Threaded
Open this post in threaded view
|

Re: Hudson Electronic Broadcast

Vin69Nik
In reply to this post by Vin69Nik
Vero layout as PDF

Hudson_Electronics_Brodcast_24V,_PG_Edition_vero_layout.pdf

and the voltages:
power supply V+ in

power supply V+ out

BC549C v@collector

BC549C v@base

BC549C v@emitter

MP200789 v@emitter

MP200789 v@base

MP200789 v@collector

All values are measured between ground (on DC jack) and desired pin.
Reply | Threaded
Open this post in threaded view
|

Re: Hudson Electronic Broadcast

BetterOffShred
Thanks man. This is great.   We all appreciate the contribution.
Reply | Threaded
Open this post in threaded view
|

Re: Hudson Electronic Broadcast

brazdj
Thank you for sharing!  The pictures and the layout.

Can you or anyone clarify the PNP transistor used for Q2?  Any suitable replacement, as I haven't been able to find any info on a 200789?

Thank you.
Reply | Threaded
Open this post in threaded view
|

Re: Hudson Electronic Broadcast

traktop
This post was updated on .
I´ve just built this last pdf layout using a bc550b for silicon transistor and for germanium, tried russians mp21a/gt108v. Both of them sounded nice with differences in texture and gain.

I just tried 9v power, but I´m planning making a voltage switch. I´m thinking on using 18v instead of 24, as some people stated in this forum, (and on tgp as well),that it worked better.

I´m trying to understand the gain switch. I used a 3 positions on-off-on switch, so now I´ve basically have a medium/low/high gain switch.
it seemed that the 470ohms resistor sets the gain for the medium gain position, because the high gain position just sends q2 emitter to the 68ohm resistor and straight to ground. So if we put a trimmer in place of the 470 resistor, we should be setting just the low gain mode, right?

Anyway, so to my understanding, the only way of adding a second trimmer for the high gain mode using my layout would imply a more complicated switching network, right?

And just out of curiosity. I seemed to understand that johnk´s schematics has not only a couple of caps with inverted polarity, but a different q1 emitter network that leads me to understand that that one could have even more gain than the layout I used. Anyone has experience with johnk´s schematics build?



Reply | Threaded
Open this post in threaded view
|

Re: Hudson Electronic Broadcast

traktop
This post was updated on .
Finally I went for a bc549b and a mp21a.
Liked better powered with 18v.
Peach guitars layout has some similarities with johnks layout. Shared C3 C6 and C9 cap values but C3/C6 polarity are inverted like in Ciaran schematics.
Johnk's omited Q2 emiter  5.6k resistor to ground. Tried it on my build, but it went farty and it just didn't sound right, so back to where it was.
Changing C3/C6 polarities is a matter of taste. I changed C6 polarity and left C3 alone.
 Placing a link where 68r resistor just gave a little more gain as I suspected.
This is by far the most dinamic overdrive I've built with difference.
Normally a good dinamic overdrive cleans up well, but always retain the pedal sound character. This one leaves your guitar tone intact when played soft and just breaks on a very beautiful vintage way with lots of harmonics when played hard.
Delicious.

Reply | Threaded
Open this post in threaded view
|

Re: Hudson Electronic Broadcast

Teddeeh

This is one of the only images ive found of the inside of a dual. Peach layout too apparently. No cut side tho.
1234