Volume, balance and tone control on the TDA1524A chip. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Tone, volume controls
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Specifications of the regulator:
Frequency band 20-20 000Hz
Tone control at 40Hz (bass) -19/+17db
Tone control at 16Khz (treble) -15/+15db
Balance adjustment -40db
Input impedance 10-60K
Output impedance 300Om
Volume control not less than -80/+21,5db
Harmonic coefficient no more than 0,3%
Relative noise level no more than -80db
Supply voltage 6-18V
This circuit is implemented on a Philips TDA1524A integrated circuit (A1524A is an analogue of the RFT company). The microcircuit is a two-channel (stereo) volume control, balance and timbre of low and high frequencies. There is also loudnes (frequency compensation). Variable resistors can be used any, because. volume, balance and timbre in this microcircuit is carried out electronically. Trimmer resistors R7 and R8 regulate the gain of the output signal, the button S1, which turns on the frequency compensation of the volume control (off in the diagram), must be latched. For those who want to constantly use frequency compensation without the possibility of turning it off, elements S1 and R9 can be excluded from the circuit. During operation, the microcircuit heats up. Glue to it (for example, with Moment glue) a small U-shaped aluminum radiator. This will increase the reliability and service life of the microcircuit.
On the printed circuit board shown here with dimensions of 50X31 mm, in addition to the volume control, balance and tone, there is a power amplifier described in the article Power amplifier on the TDA1552Q. The devices are separated on the board by a red dotted line. On the left is the volume, balance and tone control on the TDA1524A, on the right is the power amplifier on the TDA1552Q. The elements of the amplifier R1 C3 are soldered from the side of the printed conductors.
Publication: cxem.net
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