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Search: Posts Made By: Stedy
Forum: support.Hardware 27 December 2021, 00:18
Replies: 26
Views: 2,854
Posted By Stedy
Hi, My apologies, I've treated this circuit...

Hi,

My apologies, I've treated this circuit like a typical precision op-amp circuit when I did not need to. To boost the output change R325 and R335 from 390R to either 470R or 510R. This will get...
Forum: support.Hardware 21 December 2021, 16:28
Replies: 26
Views: 2,854
Posted By Stedy
I wouldn't fiddle with R335/R325 if I were you. A...

I wouldn't fiddle with R335/R325 if I were you. A typical measurement accuracy of an oscilloscope is +/- 2.5% +0.2 division, your readings are within the margin of error. If you have a true RMS 5.5...
Forum: support.Hardware 08 December 2021, 16:42
Replies: 26
Views: 2,854
Posted By Stedy
Me again. 74022 This should explain the...

Me again.

74022
This should explain the differences in audio circuits. To adjust the signal level, you need to change the parts highlighted. If it is built with the values shown in the schematics...
Forum: support.Hardware 07 December 2021, 00:17
Replies: 26
Views: 2,854
Posted By Stedy
:banghead I should have spotted the...

:banghead I should have spotted the Transimpedance amplifier!

I modelled it as an 8mA current source and the simulation has a nice sinewave output with 360 ohms for R331/R321.
Change to 1.5K and...
Forum: support.Hardware 06 December 2021, 22:18
Replies: 26
Views: 2,854
Posted By Stedy
Hi, This topic intrigued me and I had a bit...

Hi,

This topic intrigued me and I had a bit of a slow day.
The schematics on Amigawiki.org do not match the original printed versions from Commodore, I should know, I have paper copies of them.
...
Forum: support.Hardware 05 December 2021, 00:40
Replies: 26
Views: 2,854
Posted By Stedy
The attached file is a measured output from a rev...

The attached file is a measured output from a rev 2 A600.
73995
The peak to peak is 1.69V, the RMS is 0.596V.
Doing the sums, it equates to -2.25dB below Pro reference level.

The second...
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