Msn I had a frrling something was wrong...I tried powering it with 2 transformers today and the opamp is messedup now. I can measure the output from the unity gain buffer fine and it works properly but the second output is ruined..I get spikes or similar.
I have been meaning to ask, how do I reduce voltage some without using a huge resistor....I have these voltage regulator componeents that are smps regulators in a package(buck regulators), they only require an inductor, few caps, and shotky diode outside of them...The ones I have are rated to supply 3 amps.
It is woerd because my oscope measured 34V DC, and my CHEAP meter measured 42! Maybe the cheap meter loaded the trasformer?
Since my regulator is SMPS and it is attenuating voltage I should have little to no loss right? Btw, I was wrong about my other transformer beeing bad...I properly measured it today. Also, I forgot, the transformer is a 12.6-0-12.6 and NOT 12-0-12...So it is about 50VA I guess. So for 20Wrms, and 50VA I should be fine right?
Question, my SMPS regulator is variable, so what voltage should I dial it to with a measured rectified DC voltage of 34V from my supply? That was measured unloaded btw..I am going to use a trimpot to vary the out voltage...