I want to control 2 opamps to activate one circuit at a time so I designed an analog selector.

Each circuit works very well. But when I connected them the voltage on the base of T4 jump to 17V. I think I have a current problem but I don't know what to do enter image description here

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    \$\begingroup\$ what is an "aop"? \$\endgroup\$ – Marcus Müller Aug 20 '20 at 10:14
  • \$\begingroup\$ @MarcusMüller operational amplifier \$\endgroup\$ – walid24 Aug 20 '20 at 10:21
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    \$\begingroup\$ changed oap to opamp then; never read aop anywhere else :) \$\endgroup\$ – Marcus Müller Aug 20 '20 at 10:22
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    \$\begingroup\$ What does the "a" bit stand for in "aop"? \$\endgroup\$ – Andy aka Aug 20 '20 at 10:22
  • \$\begingroup\$ @Andyaka I'd guess amplifier, and it might be an abbreviation from French, where abbreviations are often "Noun adjective (NA)" instead of of "adjective Noun (AN)". \$\endgroup\$ – Marcus Müller Aug 20 '20 at 10:24

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