Single Supply Op-Amp Hi-Fi Tone Control Stereo Preamp Circuit Diagram
Single Supply Op-Amp Hi-Fi Tone Control Stereo Preamp Circuit Diagram
These single supply op-amp hi-fi stereo tone control preamplifier circuit with TDA1054 IC built by SGS. TDA1054 is a 16-pin DIL package and integrates two separate preamp.
It is a low noise preamplifier with little or no problem in the construction process. The first half of the circuit (IC1A) has an input sensitivity of 3 mV and has a frequency correction of the C5, C3, R6 and R8 together. The bass signal from phono input is amplified, while the high signal is attenuated.
The selection of signal sources is carried out with the switch S1. P1 and P2 are the parte of a double potentiometer. They control the high and low tones. There is no danger of overloading the circuit through the passive type of sound control. P3 controls the volume of the signal fed to se second part of the circuit (IC1B), which functions as an operational amplifier.
P4 controls the balance between the left and right channels, but in the schematic is shown only the precursor for a channel. Both channels have a gain of 24 in the middle of the P4 setting. If P4 is set to one extreme end, the gain between the two channels above 12 dB.
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