TTT139 Class AB Amp Testing w AnalDisc Pt1

Using the Analog Discovery to test a Class AB audio amplifier for gain and distortion.

[@jj74qformerlyjailbreak3]

By far still the best ADC2 instructor on the inter webs. Got me decoding stuff. 🙏

[@Frank_K4FMH]

Very good work, Tom! Greatly enjoy your didactic teaching using the AD 2.

[@tomtektest8042]

Thank you for your kind comment. I enjoy electronics as a hobby now that I am retired and it is an unexpected bonus for me to be able to share over KZbin with folks like you.

[@johndooley2401]

Top Notch, I learned a lot thank you

[@richardgray8593]

I don't know why, but I love to see the Analog Discovery in action.

[@tomtektest8042]

I know how you feel. Despite having tons of bigger, more expensive equipment I prefer to use the AD when I can. I think it reminds me of the days when I could not afford my own equipment and I would have given a lot for something as capable. Hope you enjoy the next part.

[@christophschuermann6512]

tomtektest i agree, and also like the AD and all the features. For more professional audio measurements i would mention that you could use a 24bit USB Audiointerface in conjunction with a good analyzer software (like Arta, rmaa etc.), to be able to measure down to 110 to 140db, depending on the used soundcard.

[@robertfenney]

Thanks, that all made sense!

[@procerpat9223]

Very nicely done, Sir

[@emi22n]

Hey,can I ask you if you know, if Analog Discovery 2 it is a good tool as a oscillosope?They say is 1 MΩ ,±25V,30 MHz,but this is with just the 1x probe or with 10x?I don't understand.

[@tomtektest8042]

The 1 M ohm is with a 1X probe, i.e. directly into the scope. A 10X probe will divide the sensitivity by 10 but multiply the impedance by 10 to 10 M ohms, so the inputs will work up to 250V. The 30 Mhz figure is with the BNC adapter board and I have found that the upper limit requires some interpretation. If the scope is well matched to the source and properly adjusted mine works to 30 Mhz but it is a little tricky to stabilize. I would say that 25 Mhz is the highest that you can rely on, although technically it does go to 30 Mhz. By the way, this is true of most scopes, their highest frequency is not necessarily usable under all conditions. This is sometimes due to the falloff of the vertical amplifier at the limit and sometimes due to unstable triggering at that same limit. So these figures need to be taken with an understanding that they are made under certain conditions that may not always be present in ordinary use.

[@emi22n]

Thank you!

[@ttl4096]

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