Even the construction of the module is similar, using his trademark perfboard and ultra-tidy wiring.Īlso new is a flexible evaluation unit for these discrete op-amp modules. This design features MOSFETs rather than BJTs, but retains the same basic five-transistor topology as the previous work, with a differential pair input stage, a gain stage, and a buffer stage. In fact, this project is a follow-on to his previous bipolar transistor op-amp, which we featured back in 2021. While we’re more accustomed to seeing ’s digital projects, he’s no stranger to the analog world. And while it doesn’t make much sense to roll your own op-amp out of discrete components, that doesn’t mean there isn’t plenty to be learned from doing just that. We tend to spec whatever does the job, and don’t give much of a thought as to the internals. When it comes to our analog designs, op-amps tend to be just another jellybean part.
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