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My attempts at a design of a 3 stage amplifier
My attempts at a design of a 3 stage amplifier
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Old 13th August 2018, 05:41 PM   #41
Mooly is offline Mooly  United Kingdom
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My attempts at a design of a 3 stage amplifier
Simulating power supplies can be done a couple of ways. One method is to set each rail up as a voltage source that appears like ripple. The three images show the settings for a - and + 45 rail of fixed ripple. This can be useful for evaluating power supply rejection.

A second method is to add an AC voltage source and bridge rectifier to the simulation. Here I have used just 1000uF reservoir caps to highlight the ripple.
Attached Images
File Type: jpg V3 +45 Volt Rail.JPG (74.5 KB, 31 views)
File Type: jpg V4 -45 Volt Rail.JPG (75.9 KB, 31 views)
File Type: jpg Capture.JPG (187.8 KB, 31 views)
File Type: jpg Capture2.JPG (287.7 KB, 26 views)
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Old 13th August 2018, 05:45 PM   #42
Mooly is offline Mooly  United Kingdom
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My attempts at a design of a 3 stage amplifier
One thing to note, the ripple simulation is now exclusively a 'transient' type meaning that DC analysis (the .op command) does not work. This is because there is no fixed DC rails powering the circuit, they are derived just like the real thing from an AC source.

If you right click the two voltage sources feeding the bridge you will see how they are set up. Note the 180 degree phase shift for one of them. Here is the sim file. If you are using LTXVII then the 30 amp rectifiers may not be included in the model library... just pick something else that is.
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File Type: asc Draft2.asc (13.9 KB, 3 views)
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Old 13th August 2018, 09:04 PM   #43
edbarx is offline edbarx  Malta
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In KiCad I used PWR_FLAG and the error did not appear anymore. However, there is still one remaining problem before I can proceed to successfully process my schematic. KiCad is telling me transistor footprints like To-92, To-225, To-3PL, etc are legacy and that I must enter their modern equivalents manually. I tried good-old-google, but it seems, at google they are more interested in giving links to commercial sites rather then giving me a link to a site that can help me.

Does anyone know of a list listing these legacy footprints and their modern codes?
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