stereo level controls

64 stereo level controls In a normal pre-amplifier, potentiometers are used for volume, balance and tone controls, but, because they carry signal voltages, their connecting wires are prone to noise pick-up. By using the Motorola TCA 5500 IC, a miniature stereo control amplifier can be constructed very easily, which does not suffer from these defects, and thus gives reasonable quality. The specifications of the circuit are shown Table Supply voltage (stabilised) Supply current Input voltage Output voltage Input impedance Output impedance Tone control (100 Hz and 10 kHz) 8 to 18 Volts Max. 30 mA Typ 25 mV RMS Max. 100 mV FINIS 100 kS1 10052 14 dB —40 to +3 dB —68 to +12 dB Min 48 dB Typ 0,1% Typ 70 dB t can be seen that only From the circuit diagram it to complete the control system. IC1 contains elec- must (50 Hz to 15 kHz, 12 dB amplification, tone control flat) P1 and P2 control base and treble respectively. P3 is the balance control, whose mid-Point gives equal amplification...