Showdown somehow?
I don't remember seeing any shots for the Brian's gainclone either. Would be interesting to get some, but I can expect that from the builders only 😉
I don't remember seeing any shots for the Brian's gainclone either. Would be interesting to get some, but I can expect that from the builders only 😉
Discussion1
I realize this is clipping a little oddly, I suspect the reason is that my signal source had a positive DC offset for those shots that I took. I'll look at this again and post the results but I don't think I need any help just yet. Thanks for offering though.
You are referring to the power supply shots. These should be a straight line, but due to added noise they appear to be fat lines. They look fat because they are essentially showing a bunch of hash/noise that varies over time, so on a digital photo it looks like a really thick line.
Well, I don't think showdown, but lets see what everyone else is getting. I'm interested in frequency response, square wave response and power output, and whatever else you all think would be interesting. This way when someone builds one they can ensure that they are getting the results that they should be getting.
I realize this is clipping a little oddly, I suspect the reason is that my signal source had a positive DC offset for those shots that I took. I'll look at this again and post the results but I don't think I need any help just yet. Thanks for offering though.
You are referring to the power supply shots. These should be a straight line, but due to added noise they appear to be fat lines. They look fat because they are essentially showing a bunch of hash/noise that varies over time, so on a digital photo it looks like a really thick line.
Well, I don't think showdown, but lets see what everyone else is getting. I'm interested in frequency response, square wave response and power output, and whatever else you all think would be interesting. This way when someone builds one they can ensure that they are getting the results that they should be getting.
My old tek has a 2nd channel which does not work correctly most times. If there is a measurement which I could take using just channel 1, with a generator, I will post results for a point to point LM3875 chipamp I built last year. I bought the scope but never really learned to use it well.
If anyone wants to help and give me a set of guidelines to produce curves for comparison, my email is below. I should have an hour or two this weekend to play and would like to contribute.
Sandy.
If anyone wants to help and give me a set of guidelines to produce curves for comparison, my email is below. I should have an hour or two this weekend to play and would like to contribute.
Sandy.
Why are you trying to blame everything on the scope? It is not that difficult to calibrate it.
I would rather admit that there might be something wrong with the amp - most probably both the chip and the design.
I would rather admit that there might be something wrong with the amp - most probably both the chip and the design.
Bump
Just bumping the thread in case anyone want to help me know how to measure my GC with my tek 465 scope to get another data point. I've not used a scope before and the settings aren't clear to me.
Let me know!
Sandy.
Just bumping the thread in case anyone want to help me know how to measure my GC with my tek 465 scope to get another data point. I've not used a scope before and the settings aren't clear to me.
Let me know!
Sandy.
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