T1 was removed and I had switched off the channel and forgot to switch off the gradient channel for T1. What are the effects of this?
When no sensor is installed the + terminal of the op-amp that services Fast T1 is simply open – not connected to anything. The circuit output is undefined in this case but I’ve not seen any problems. It is not impossible however that Fast T1 oscillated badly and maybe swamped out both gradient channels. All gradient gains are implemented by the same IC, I use a dual DAC, one for each gradient channel so channel-channel cross talk at higher frequencies is not impossible.
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