Tone selector circuit

  
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Figure 4-12 is a five-speed type tone selector schematics o as follows: circuit, IC1 and other components electromagnetic phono equalizer amplifier, I bar and external RC compo
Tone selector circuit - schematic

nents and composition of the selection switch tone tune selector circuit. Press the straight button, sAl, SA2 action, SAi negative feedback loop in the T-type network c8.. Rs disconnect, saz will C7 short-circuit to be a typical linear amplifier gain is determined by the advocate 3 (R5 + R6), having a flat output characteristic straight. Press the Language key, SAi ~ SPk action, SAl, SA2 position with the straight key, the amplifier frequency response was flat state. SA3, SA4 at the amplifier input termination people bandpass filter passband is. :, 200 ~ 3000Hz band signal by a 6dB/f audio attenuation. When you press the play button, carved altar of the parallel operation of a resistor R4 on the C7, the high-bass slightly improved. When you press the orchestral key, SA7 action, T-type network people are short-circuited, C8 ground bass are to be mentioned liters. Press the bass is key, S: Ag, SAio action, catch the negative feedback loop capacitor b, C series, treble negative feedback enhanced bass can be improved, SAio with the network of T-type people and the resistance R7, so treble slightly, the discharge pitch bass balance electricity use 5 4 interlocking key switch.




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