Hi all,
I have recently built a railsplitter using an OPA551 from TI in follower mode after a suitable voltage divider. The circuit is powered by the following wall wart 24VDC power supply (see Eagle schematic below).
https://www.digikey.ca/product-detail/en/triad-magnetics/WSU240-0500/237-1459-ND/3094985
It provides a nice +-12VDC to loads down to 100 Ohms. However, when I use it to power my Wien bridge oscillator circuit (see other eagle schematic), weird spikes appears in the output waveform (see scope print screen). This bridge used to be powered by a linear rectified power supply and did not exhibit this weird behavior.
It is a pain at low frequencies, since it adds spikes to the output waveform. At higher frequencies, theses spikes add ''phase jitter'' to the output, which makes it looks shaky on the oscilloscope.
I am wondering if you guys had any idea what might be causing this. I read crossover distortion might produce similar spikes, but it doesn't look like the cases I've previously seen (some kind of cut in the waveform).
Thanks in advance!
I have recently built a railsplitter using an OPA551 from TI in follower mode after a suitable voltage divider. The circuit is powered by the following wall wart 24VDC power supply (see Eagle schematic below).
https://www.digikey.ca/product-detail/en/triad-magnetics/WSU240-0500/237-1459-ND/3094985
It provides a nice +-12VDC to loads down to 100 Ohms. However, when I use it to power my Wien bridge oscillator circuit (see other eagle schematic), weird spikes appears in the output waveform (see scope print screen). This bridge used to be powered by a linear rectified power supply and did not exhibit this weird behavior.
It is a pain at low frequencies, since it adds spikes to the output waveform. At higher frequencies, theses spikes add ''phase jitter'' to the output, which makes it looks shaky on the oscilloscope.
I am wondering if you guys had any idea what might be causing this. I read crossover distortion might produce similar spikes, but it doesn't look like the cases I've previously seen (some kind of cut in the waveform).
Thanks in advance!
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