By Keith Brindley
All the tasks during this number of facts records presents a construction block which constructors can use to test with elements and use as a place to begin for additional improvement. This e-book will therefore offer a toolkit for construction audio structures and circuits in line with available elements utilizing hassle-free suggestions. each one undertaking relies round an built-in circuit gadget, chosen for book due to its unique beneficial properties, since it is rare, since it electronically smart, or just simply because we expect readers could be drawn to it. a few of the units used are really particular in functionality — in different phrases, the built-in circuit is designed and equipped for one goal by myself. energy amplifier built-in circuits are sturdy examples. Others, nevertheless, should not particular in any respect, and will be utilized in any variety of purposes. Bucket brigade hold up strains, say, can be utilized in every kind of audio tasks. certainly, the circuit or circuits linked to each one built-in circuit machine replicate this. whereas all circuits given with all built-in circuits listed below are meant for experimental use simply — they aren't complete tasks in any respect — a broadcast circuit board song and format are precise. to assist readers, the broadcast circuit forums (and kits of components for the various initiatives, too) can be found from Maplin, yet — as those circuits are for experimental use in simple terms — all constructional information and any consequent fault discovering is left upto readers.
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Additional info for Audio IC Projects
Typical uses for the module could include low power audio amplification in portable radios, cassette recorders and related devices. Also, the high gain capability of the circuit makes it ideal for use in intercoms and baby alarms, where the module may be used to amplify signals from a microphone with very lit tle pre-amplification to a suitable level to drive a loudspeaker directly. 5 shows the specification of the proto type TDA7052 1 watt power amplifier module. s. 6 W metal film Rl RV1 1 k 10 k log lin pot 1 1 (M1K) (JM77J) 2μ2Ρ 63 V min electrolytic 1 100 nF ceramic 1 100 μΨ 16 V min electrolytic 1 (YY32K) (YR75S) (RA55K) Capacitors Cl C2 C3 Semiconductors ICI TDA7052 (UK79L) Miscellaneous Pl-11 1 mm PCB pins DIL socket 8-pin printed circuit board constructors' guide 1 Pkt (FL24B) 1 (BL17T) 1 (GE41U) 1 (XH79L) 31 Audio IC projects TDA1514A power amplifier The TDA1514A is a high quality power amplifier inte grated circuit which is compatible with a wide range of source material, including compact disc.
1% 99 dB 20 Hz to 25 kHz -3 dB Specifications of prototype 37 Audio IC projects Conditions Parameter Symbol Min Typ Max Supply voltage range pin 6 and pin 4 wrt pin 8 Closed loop voltage gain Input resistance Signal plus noise to noise ratio Supply voltage ripple rejection 'tot 60 mA Po 40 W Po 60 W Determined externally Determined externally Gc 30 dB R, 20 kQ P0 = 50 mW (S + N) -r N 82 dB / = 100 Hz SVRR 72 dB wrt = with respect to. 31 shows the module with the minimum power supply required, which consists of a transformer and bridge rectifier.
52 Pre-amplifiers and filters The circuit uses ICl(b) to turn on ICI (a) whenever input voltage (Vin) becomes more positive than output voltage (V^. Pulling the output of ICl(b) low via diode Dl pre vents capacitor Cl charging any more and therefore effectively holds the output voltage constant until Cl discharges. Figure 2 . 6 A typical peak detector and hold circuit IC power supply requirements The LM13700 integrated circuit requires a split rail power supply and will operate over a wide range of voltages between ±2 V and ±15 V.
Audio IC Projects by Keith Brindley