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I am currently trying to design an x-over. The response of what I have spiced does not correlate to what I though would happen. Have I made any obvious mistakes?

I want a Sallen-key HP/LP. That crosses over at around 120hz with a gap between the Hp & Lp points because of the driver units being mismatched.

Any thing obvious I’ve done wrong?

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  • \$\begingroup\$ What power supply are you using? \$\endgroup\$ – a concerned citizen Nov 10 '18 at 16:36
  • \$\begingroup\$ Why we have got to use is a 18v DC adaptor stolen from something else. So I’m splitting it with two 10k resistors and off of the middle tap I have an op amp buffer and between the three taps I have two 100nF caps for smoothing. \$\endgroup\$ – Fatchild1 Nov 18 '18 at 17:26
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Any thing obvious I’ve done wrong?

I'm not ruling out other issues but you haven't got ground connected properly: -

enter image description here

You also need to put power rails on the op-amp.

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  • \$\begingroup\$ Thanks Andy! An obvious mistake.... Now working the way i expected. \$\endgroup\$ – Fatchild1 Nov 10 '18 at 11:04

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