Sinclair Microvision MTV1 Service Manual page 15

Circuit diagram for reference only; it is suggested you refer to the original later in this document.
The sound IF limiting amplifier is preceded by three PIN diode switched ceramic filters (to select
the correct intercarrier sound IF frequency of 4.5, 5.5 or 6.0MHz). The limited IF signal is fed to a
quadrature detector producing an AF output for amplification to drive the loudspeaker.
The IF amplifier and detector and audio amplifier are contained on two bipolar linear ICs.
Page 15 of 39
Sinclair MTV1 service manual V2.1