Audio Processor Circuit using SSM2045 ICThis audio processor ambit appearance the SSM2045 IC which was developed distinctively for cyberbanking music applications and the 741 opamp IC. The ambit is configured as a low canyon clarify with a DC voltage ascendancy for gain. The ascribe arresting is set to a alive akin of 150mVpp through the resistor R1.
The clarify has 2 buffered outputs: the 2-pole achievement at pin 1 and 4-pole achievement at pin 8. Internally, the outputs are affiliated to 2 voltage-controlled-amplifiers (VCA). The R15 and R16 are affiliated to these outputs to accomplish optimum account and ascendancy voltage suppression.
P4 is the aggregate control. The accepted that flows to the pins 15 and 16 should not go above the best of 250 µA. The antithesis of the two VCAs and the absolute clarify is actuality controlled be a voltage ambit of -250 mV to + 250 mV at pin 14. This voltage can be set by P2.
The ascribe can be apprenticed with antecedent impedances up to a best of 200 Ω. With an ascribe akin of 0dBm, the VCA weakens by 6 dB. The bent accepted bare at pin 17 is amid 120 µA and 185 µA. The blow abundance can be confused amid 20 Hz and 20 kHz with a capricious voltage at pin 5. This can be assorted through P1. The capacitor ethics were called to accord the clarify its Butterworth characteristics.
The achievement accepted of the SSM2045 IC is adapted to a voltage achievement by the 741 opamp. Any sybsequent ambit charge be DC decoupled from IC2. The noise-voltage allowance is about 80 dB.
