ZX-Spectrum +3's amplifier connection

If it is needed the +3 can be connected to an amplifier using the TAPE/SOUND socket. This is a 3.5mm jack socket producing 200mV pk-pk at approximately 5 Kohms impedance. When using an amplifier, it is worth remembering that if you have connected a cassette unit to the +3, the tape 'load' and 'save' signals are also fed to the TAPE/SOUND socket (and therefore the amplifier's volume control should be turned down when performing these operations).

                         Input
                       (not used)
                           |
                           |       ___
             ___    _      v      |   --_
  (not used)    \/ | |     _ _____|      -.___________
                   | |  ()[_[_____|       |___________
Audio output _/\   |_|  ^       | |     _-'
                    |   |       | |___--
GND (common) _______|   |       |
                      Audio    GND
                      output (common)

                    TAPE/SOUND socket

Source: [The Hardware Book]

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