The TDA1074A is a monolithic integrated circuit designed for use as volume and tone control circuit in stereo amplifiers. This dual tandem potentiometer IC consists of two ganged pairs of electronic potentiometers with the eight inputs connected via impedance converters, and the four outputs driving individual operational amplifiers. The setting of each electronic potentiometer pair is controlled by an individual d.c. control voltage. The potentiometers operate by current division between the arms of cross-coupled long-tailed pairs. The current division factor is determined by the level and polarity of the d.c. control voltage with respect to an externally available reference level of half the supply voltage. Since the electronic potentiometers are adjusted by a d.c. control voltage, each pair can be controlled by single linear potentiometers which can be located in any position dictated by the equipment styling. Since the input feedback impedances around the operational amplifier gain blocks are external, the TDA1074A can perform bass/treble and volume/loudness control. It also can be used as a low-level fader to control the sound distribution between the front and rear loudspeakers.
The Philips TDA1074A is a monolithic integrated circuit designed to function as a volume and tone control circuit within stereo amplifier systems. It features two ganged pairs of electronic potentiometers with eight inputs connected via impedance converters and four outputs driving individual operational amplifiers. The device allows for precise control of audio levels using d.c. control voltages, enabling applications such as bass/treble adjustment, volume/loudness control, and sound distribution between front and rear speakers in car radio installations.
| Supply voltage (typical) | 20 V |
|---|---|
| Supply current (typical) | 22 mA |
| Total harmonic distortion (typical) | 0,05 % |
| Control range (typical) | 110 dB |
| Cross-talk attenuation (L/R) (typical) | 80 dB |
| Supply voltage range | 7,5 to 23 V |
| Operating ambient temperature range | -30 to +80 °C |
It is designed for use as a volume and tone control circuit in stereo amplifiers.
Yes, it can be used as a low-level fader for this purpose.
The ganged potentiometers track within 0,5 dB.