abechap024
Well-known member
Ok great, thanks for the orders guys....excited to see this ball rolling.
Cheers,
Abe
Cheers,
Abe
Discrete Dip 8 Opamp
- Thread starter abechap024
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abechap024
Well-known member
Okay they will be shipped out to me on the 16th of this month, I was able to order a bunch tall and a bunch short.
It might be a week or so over the time that I think I told you guys they would be here, so all you that ordered I'll have some bonus gifts for you
Excited to upgrade some equipment!
Cheers,
Abe
It might be a week or so over the time that I think I told you guys they would be here, so all you that ordered I'll have some bonus gifts for you
Excited to upgrade some equipment!
Cheers,
Abe
abechap024
Well-known member
Yes, thats fine just let me know what kinds you want when you order them, there is a place for notes before you confirm.
Cheers!
Abe
Cheers!
Abe
abechap024
Well-known member
The pins you can get just as bulk headers, standard spacing. I know they sell them on the bay...pretty cheap too!
Cheers,
Abe
Cheers,
Abe
abechap024
Well-known member
Yep, sure would. just make sure spacing is 0.1"
Cheers,
Abe
Cheers,
Abe
abechap024
Well-known member
shipped from the factory....wont be long now!
abechap024
Well-known member
So I received them today and did a quick test of one and so far so good! Cant wait to rechip my console. For all of you that already pre ordered yours are going out tomorrow and, you can still order at my site if you want some.
Im working on a little build manual and will have some kits together hopefully by next week.
cheers!
Im working on a little build manual and will have some kits together hopefully by next week.
cheers!
gemini86
Well-known member
pics maybe?
abechap024
Well-known member
Glad you asked
abechap024
Well-known member
abechap024
Well-known member
The trickiest part was soldering some of the connections in between the 2 boards when mounting them to the base. But eventually figured it out.
Just stuck one in my consoles mix buss, and the sound very great!. Had to increase feedback capacitors by a small amount. And really I'm just stoked they work, haven't done any mixing through them yet. And probably won't till I rechip the mix-busses and master-busses. for my channels the "Tall" work great. I imagine for other stuff the wide will be needed.
Also my DMM that measure HFE broke a while ago, So I didn't match the input transistors. What does that effect? output offest?
Just stuck one in my consoles mix buss, and the sound very great!. Had to increase feedback capacitors by a small amount. And really I'm just stoked they work, haven't done any mixing through them yet. And probably won't till I rechip the mix-busses and master-busses. for my channels the "Tall" work great. I imagine for other stuff the wide will be needed.
Also my DMM that measure HFE broke a while ago, So I didn't match the input transistors. What does that effect? output offest?
gemini86
Well-known member
the wides are on the photo, on the right...he was able to order them together. Okay, I may have to buy a couple, but first I'll need to get some other projects off the bench...well done, Abe!
abechap024
Well-known member
Wides are In (gemini beat me to it! )
I have a package coming your way tomorrow.
I added 47pf to the underside of the opamp (there is plenty of room with the pins I'm using) to make it stable in a sum amp configuration. And It looks like I took all the original feedback capacitors out of of the sum chips in my console when I install the opa227s I was using cause they are internally compensated and did fine.
So 47pf.
Soundwise, its definitely too late to tell, but doing some quick A/Bs definitely an improvement, sounds less "tubby" Anyway we all know these circuits sound great.
Thanks
Abe
(gemini beat me to it! )I have a package coming your way tomorrow.
I added 47pf to the underside of the opamp (there is plenty of room with the pins I'm using) to make it stable in a sum amp configuration. And It looks like I took all the original feedback capacitors out of of the sum chips in my console when I install the opa227s I was using cause they are internally compensated and did fine.
So 47pf.
Soundwise, its definitely too late to tell, but doing some quick A/Bs definitely an improvement, sounds less "tubby" Anyway we all know these circuits sound great.
Thanks
Abe
IIRC the stacked PCBs like that are called "cordwood" construction, while they put the parts between the two layers.
I recall seeing that done back in the '60s, for circuitry that needed to be really miniaturized.
It might be a good idea to throw some documentation inside any unit using these, to help future owners troubleshoot/repair their units. Also be careful that products using lots of these have enough power supply to support the DOAs that generally draw more current than ICs.
JR
I recall seeing that done back in the '60s, for circuitry that needed to be really miniaturized.
It might be a good idea to throw some documentation inside any unit using these, to help future owners troubleshoot/repair their units. Also be careful that products using lots of these have enough power supply to support the DOAs that generally draw more current than ICs.
JR
