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Search: Posts Made By: ugrnm
Forum: support.Hardware 18 January 2022, 22:32
Replies: 26
Views: 2,853
Posted By ugrnm
Yes, my plan is to gather my notes and document...

Yes, my plan is to gather my notes and document the changes I made! I will bump this thread when done.
Forum: support.Hardware 18 January 2022, 20:39
Replies: 26
Views: 2,853
Posted By ugrnm
Thanks! I know I should have measured things...

Thanks!

I know I should have measured things more seriously, I did not think of just recording with a soundcard... I was having way too much fun working on all this.

I did notice though that...
Forum: support.Hardware 18 January 2022, 17:44
Replies: 26
Views: 2,853
Posted By ugrnm
I'm not sure it was clear what I was trying to...

I'm not sure it was clear what I was trying to do... :)

But...

In the end I changed all the components in the audio circuit path (new op amp and 1% resistors, new caps, etc). If anything it was...
Forum: support.Hardware 27 December 2021, 12:33
Replies: 26
Views: 2,853
Posted By ugrnm
I don't understand how you end up with these...

I don't understand how you end up with these values. If I aim at something around 3.472Vpp, R325 and R335 should be much higher, no?

Is there something wrong with my reasoning? See attached.
...
Forum: support.Hardware 21 December 2021, 18:12
Replies: 26
Views: 2,853
Posted By ugrnm
What could go wrong if I mess around with...

What could go wrong if I mess around with R335/R325? Bare in mind I'm very new to electronics so I may not see the bigger picture.

My intention is to make a simple mod to have a higher signal...
Forum: support.Hardware 20 December 2021, 18:23
Replies: 26
Views: 2,853
Posted By ugrnm
Yes you're correct, and there are 2 issues in...

Yes you're correct, and there are 2 issues in fact. Signal level is important for me as the A600 will be plugged in a mixer with other synths that are all louder and not necessarily with a master...
Forum: support.Hardware 20 December 2021, 18:02
Replies: 26
Views: 2,853
Posted By ugrnm
Some measurements with a scope, using the 500Hz...

Some measurements with a scope, using the 500Hz sine wave from AmigaTestKit. No clipping, offset, weirdness was visible.

At the exit of C334:

Vpp 1/R + 2/R 5.64-5.68
Vpp 1/R 3.12-3.16
Vpp...
Forum: support.Hardware 20 December 2021, 17:11
Replies: 26
Views: 2,853
Posted By ugrnm
So basically the audio circuit on your 2B A600 is...

So basically the audio circuit on your 2B A600 is the same as the audio circuit of my 1.3 A600? Below is the full schematics found there http://www.devili.iki.fi/mirrors/4x4.hopto.org/ and that...
Forum: support.Hardware 10 December 2021, 19:05
Replies: 26
Views: 2,853
Posted By ugrnm
Wow, so many replies! Of course!...

Wow, so many replies!



Of course! Ooops. My bad.



Perfect, thanks!
Forum: support.Hardware 05 December 2021, 17:29
Replies: 26
Views: 2,853
Posted By ugrnm
Oh and, with the loud A1200 signal dipping into...

Oh and, with the loud A1200 signal dipping into the negatives, I'm wondering if this why sometimes people have recommend to put bi-polar caps there...
Forum: support.Hardware 05 December 2021, 17:24
Replies: 26
Views: 2,853
Posted By ugrnm
Thanks! This is very useful, I 'm gonna measure...

Thanks! This is very useful, I 'm gonna measure mine this week and see what are the differences. What did you use to generate a 1kHz sine wave from the Amiga?



Yes it seems to be that...
Forum: support.Hardware 04 December 2021, 17:18
Replies: 26
Views: 2,853
Posted By ugrnm
Line level of the Amiga 600 (and possibly other models)

Hello,

I'm going through some maintenance of my Amiga 600, with a special focus on the audio. I'm getting to the point where everything sounds great, no more cracks, hums, CPU activity leak...
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