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<blockquote data-quote="Elliot Woodman" data-source="post: 8924726" data-attributes="member: 694767">ok, thank you, I was aware that the amp would be expecting an offset, I was using a rail splitter in that schematic that provided a rail at half supply, that I have tied the signal to. This allows the 6v rail to be referenced as ground by the op Amps, so the real ground (0v) acts as the negative rail. I admit that the labelling on my drawings may be a bit confusing as I have called the 6v rail 0v, just so it all makes sense to me whilst figuring things out. depending on how well the Op amps can swing close to their rails, I expect that it should be running on 14v which is the otuput of the alternator. (at least wen rad fans, lights etc are not on) so for a +- 7v supply for the op ams. Assuming they can swing to around 1v of supply, a 6v peak signal corresponds to around 4.2 rms.Also by differential, do you mean balanced? i could produce a balanced output with a simple inverting circuit for each channel?cheers for the help <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" /></blockquote>

[QUOTE="Elliot Woodman, post: 8924726, member: 694767"] ok, thank you, I was aware that the amp would be expecting an offset, I was using a rail splitter in that schematic that provided a rail at half supply, that I have tied the signal to. This allows the 6v rail to be referenced as ground by the op Amps, so the real ground (0v) acts as the negative rail. I admit that the labelling on my drawings may be a bit confusing as I have called the 6v rail 0v, just so it all makes sense to me whilst figuring things out. depending on how well the Op amps can swing close to their rails, I expect that it should be running on 14v which is the otuput of the alternator. (at least wen rad fans, lights etc are not on) so for a +- 7v supply for the op ams. Assuming they can swing to around 1v of supply, a 6v peak signal corresponds to around 4.2 rms. Also by differential, do you mean balanced? i could produce a balanced output with a simple inverting circuit for each channel? cheers for the help :) [/QUOTE]

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