PROPHET64 & MSSIAH Userforum




Official information and support forum for
MSSIAH and all PROPHET64 versions.



You are not logged in.

#1 2011-07-26 07:58:55

eggstoast
Bloody beginner
Registered: 2011-07-26
Posts: 6

My Simple Style mod

This is my first c64 mod. I like the nostalgia of the old colors and probably won't rattle it. Have another Breadbin in progress that I won't be so conservative. I wasn't exactly sure how to wire the feedback becuase it doesn't seem to do anything, besides that it all works. If somone would like to PM me with some information about feedback on a breadbin style I would be really happy, otherwise I may just add another pot and turn them into volume knobs to equalize the outputs to the inputs. I plan to add a shutoff switch as well for the jjoysticks even though I doubt i'll plug a game into it. theres a 6581 R3 and an R4 on the Sid2Sid. Which makes a very nice stereo seperation, in some aspects these chips behave completely differently and even more so when they get warmed up.


I love how the breadbin has so much room. My first try on a flat one ended in tragedy. Those SID chips sure heat up too! Looking at this more im thinking about flipping the trim pots over and having them accessible from the front edge underneath but they never go out of tune so that might just be extra work.

http://i.imgur.com/xLPOU.jpg



I notice my pots aren't so even, haphazard measuring and cheap drill bits. Painting it will probably hide the errors but i love that tanish brown color. Having the pots o the center of that angle doesn't help for positioning, I think I will commit them either up or down on the next box  so they are not so impossible to align perfectly.

http://i.imgur.com/0BUBT.jpg

I love how the breadbin is so fat. I can stuff pretty much anything in there easily. Which is great becuase there were wires everywhere in testing. A lot neater now though.

http://i.imgur.com/2s3Vc.jpg

So this was my very first post, and I look forward to making a few more. Thanks for looking!

Last edited by eggstoast (2011-07-26 08:24:00)

Offline

 

#2 2011-07-28 21:38:08

InactiveX
The Last Ninja
From: England
Registered: 2008-08-14
Posts: 280

Re: My Simple Style mod

Some great mods in there! All very tidy inside too.

Offline

 

#3 2011-09-07 10:49:36

luke-beataddicts
The Last Ninja
From: West London
Registered: 2009-04-12
Posts: 258
Website

Re: My Simple Style mod

retro coolnes

Offline

 

#4 2012-01-04 00:15:13

eggstoast
Bloody beginner
Registered: 2011-07-26
Posts: 6

Re: My Simple Style mod

This is the final product:

Back
http://i.imgur.com/E4PcV.jpg

Back/Top
http://i.imgur.com/OzgK0.jpg

Top
http://i.imgur.com/aFAu5.jpg

Inside
http://i.imgur.com/wz07X.jpg

Covered
http://i.imgur.com/XY8W2.jpg

Offline

 

#5 2012-01-04 03:02:20

InactiveX
The Last Ninja
From: England
Registered: 2008-08-14
Posts: 280

Re: My Simple Style mod

These non-flashy mods are definitely more to my taste (my last remaining C64 is a breadbin too, even more simple - I have an external pot box that connects to the joystick ports). Also very comprehensive on the I/O!

Offline

 

#6 2012-01-04 08:22:24

eggstoast
Bloody beginner
Registered: 2011-07-26
Posts: 6

Re: My Simple Style mod

The pots with the trim mod was the most difficult part to build. I should build a couple at the same time, since once those are built it's just about where you want to put everything. Breadbin is absolutely the best for these mods, as it has a lot of personality and a lot of room in the casing. I really wish there was a little more information on the feedback schematics, I never did get that to work properly so I went with volume per SID instead.

I also noticed that if the input source gets too loud, which usually doesn't even seem that loud it pops out of using the SIDS filtering and bypasses it until you re-inititiate the input. Not sure if that's how it's supposed to be.

Having tons of fun with this beast though.

Offline

 

#7 2012-01-04 10:29:18

InactiveX
The Last Ninja
From: England
Registered: 2008-08-14
Posts: 280

Re: My Simple Style mod

eggstoast wrote:

The pots with the trim mod was the most difficult part to build. I should build a couple at the same time, since once those are built it's just about where you want to put everything.

Just wondering, did you use my circuit here?

eggstoast wrote:

Breadbin is absolutely the best for these mods, as it has a lot of personality and a lot of room in the casing.

Too right! I've got a chunky ground loop isolator in mine to protect the SID from nasty stuff caused by connections.

Offline

 

#8 2012-01-04 21:53:01

eggstoast
Bloody beginner
Registered: 2011-07-26
Posts: 6

Re: My Simple Style mod

Yep! that's the one. I am not the greatest at looking at a schematic and then laying everything out. The first one I did was a complete disaster, so after 3 hours of working on it I decided to start over. I didn't realize it was you who designed the schematics, much appreciated.

Do you have a schematic for feedback? I am going to try and get that running on the next box I am working on, or is it that it just doesn't work on the older SID chips? My next one will probably be using the newer SID chips as soon as I can find the parts.

The ground loop insulator has peaked my interest, I am going to look into that.

Do you have the same problem with your inputs as I do when the source gets loud enough, the SID stops filtering it and it bypasses?

Offline

 

#9 2012-01-05 05:12:57

InactiveX
The Last Ninja
From: England
Registered: 2008-08-14
Posts: 280

Re: My Simple Style mod

Great! Very glad it's worked for you!

I'm afraid I have never used the feedback mod, or indeed used the line-in at all. sad I have no need for it and have always been a bit wary of how safe it is, what with the delicate SIDs.

This is the type of isolator I use:

http://highlanderclub.ru/files/ground_loop.jpg

You can find them on your auction site of choice. wink Although they are stereo, I only use one side (single SID here), but you can use both of the channels for dual-SID.

Offline

 

#10 2012-01-05 08:37:56

eggstoast
Bloody beginner
Registered: 2011-07-26
Posts: 6

Re: My Simple Style mod

I assume you cut the RCA's off and then connect the +/- between the SID and the output? Is there a sound difference or is it just for protection?

Could this also be used for protection on the inputs? I agree that serving sound through these old SIDs scares me a little, the filter sounds really cool though, especially on a drum machine.

Just ordered one

Last edited by eggstoast (2012-01-05 10:41:52)

Offline

 

#11 2012-01-05 13:55:03

InactiveX
The Last Ninja
From: England
Registered: 2008-08-14
Posts: 280

Re: My Simple Style mod

Yes, I simply snipped the plugs off and wired the isolator in line.

The isolator is there for protection only. There is no discernable sound difference. I would expect to hear some degradation if I were listening to a digitally recorded classical performance through it, but with the SID you'd never notice.

There's no reason why you couldn't use one on the input as well.

Offline

 

Board footer

Powered by
© Copyright 2002–2008