As an update, while I said my LF353's work, they actually worked a bit better than I expected. Their GBP is almost good enough for this application - so I decided to try adding a few more stages to compensate for the attenuation at high frequency. The same type of distortion appeared in my...
Thanks Carl, I tried some 3 pF capacitors in parallel with the feedback resistors. Filtering down high frequency oscillations did not seem to cause any change.
I didn't have any LM741's laying around but I do have LF353 which are JFET input general purpose amplifiers which I am quite familiar...
I've tried the probe at x10 and x1 settings see if the measurement was playing a role (and set the oscilloscope accordingly). I've also tried dialing the input signal way down to see if there was some limit in the output voltage swing. Neither change affected the shape of the output
The highest number of chips (2 amps each) was 4, which is when I saw the 200 mA. What doesn't make sense?
Let me give a very broad overview of my problem: I have a circuit that works fine with one stage. Ideally I should be able to add duplicates of these stages in series as many times as I...
The chips quiescent current draw is 15 mA each (typical). I have 4 hooked up. That's 60 mA just to turn them on. 200 mA is the max I ever see, and that's when I up the input voltage to nearly saturate the 6th stage output (25 Vp-p approx). 5 Vp-p at the input of the final stage across the 220 Ω...
I'm assuming you are referring to a connection between two 15V supplies, where the negative of one would be connected to the positive of the other. In this case, I'm using a ±15V supply rated to 3A on either rail, so that connection is provided internally to the supply. I need only connect +15...
amplifier circuit
This is really all I'm building using 5% tolerance 1/4 W resistors. I have more of these stages in series but that should give you an idea. I was originally trying to do a little filtering as well but was experiencing problems so I dialed it back to the most basic case I...
Thanks for the reply, but I've tried adjusting the input to -20 dB attenuation. The output doesn't saturate, it only distorts. The signal I'm starting with is about 0.1 mVp-p. I have successfully set up several stages in series with small gains (about 4 each). I should, to my knowledge, be able...
I am having some issues designing a simple amplifier circuit and was wondering if anyone could help me. I feel like I am missing something fundamental, but can't seem to grasp it.
I'm using an AD826 dual operational amplifier using ±15 V supplies. I've breadboarded some very simple noninverting...