Author Topic: One more layout to retrofit into SD-1  (Read 8182 times)

Crazyyellowfox

One more layout to retrofit into SD-1
« on: September 23, 2009, 01:08:50 AM »
http://crazyyellowfox.net/sd14558.pdf

I made one more layout for the Op Amp in the SD-1. I won't get a chance to test drive this until I can crack open my SD-1
at my folks' place next month. If anyone one does get a chance to try it, let me know if I've made any errors.
Again, for space consideration, resistors are crammed as to either be 1/8watt or standing on end.

I feel like I missed the bus on this thing since all the action seemed to take place about three years ago

Crazyyellowfox

Re: One more layout to retrofit into SD-1
« Reply #1 on: September 24, 2009, 10:07:48 PM »
http://crazyyellowfox.net/sd14558-soic.pdf

Sorry folks, I couldn't help myself...

This is a good one to test one's soldering skills with. soic 4558 saves a good 1/4 inch of board space.
I like this better because the pinout matches a dual op amp better without having to twist one side of
the cabling for the pinout to match.

Pinout matches if thru-hole parts are face down, solder-side up.

Crazyyellowfox

Verified with changes and pics.
« Reply #2 on: October 05, 2009, 01:04:54 AM »
I put this together over the weekend, it works and it fits! Sounds great, too!

Will post sound clips tomorrow, but for now:






Joe

Re: One more layout to retrofit into SD-1
« Reply #3 on: October 05, 2009, 08:12:37 PM »
Looks awesome.

Crazyyellowfox

Re: One more layout to retrofit into SD-1
« Reply #4 on: October 06, 2009, 12:37:01 AM »
Here's what is sounds like.
http://dl.getdropbox.com/u/561191/sd-1.mp3

It's a lot warmer and brighter than the 4558 chip, and a bit more transparent, but what I realy like is it has
just the right amount of "fizzle" like frying bacon with every note. I used BC557s and a 2N5088 for this board,
this combination biased at 5.6k for me.

I knowit probably doesn't need to be said, but I made the mistake. pinouts for BCxxx trannies are different
from 2Nxxxx so be sure you have the emmiters tied together on the PNPs when building this circuit.