By Keith Brindley (Eds.)
All the tasks during this number of information records presents a 'building block' which constructors can use to scan with elements and use as a place to begin for extra improvement. This e-book will hence supply a toolkit for development audio platforms and circuits in line with available parts utilizing elementary techniques.
Maplin employees are skilled services of venture principles with helpful gains and plenty of purposes. all the circuits during this ebook are established round available chips, and supply an outstanding approach to get to grips with the features of the chip in addition to supplying building information for worthwhile tasks. every one contains pinouts and pin designations, output waveforms, elements lists, circuit diagrams, PCB layouts and images of the forums. The initiatives defined during this publication are in line with these showing within the well known facts documents characteristic in Electronics, the Maplin Magazine.
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Additional info for Audio IC Projects. A Collection of Useful Circuits Based on Readily Available Chips
W"1) is ideal, the order code is HQ70M. An insulat ing washer must be used between the integrated circuit and heatsink if the heatsink is electrically connected to earth, 0 V or any supply line, a suitable washer is avail able the order code is UL74R. The TDA1514A should be secured using either M3 bolts or No. 4 self-tapping screws of suitable length. Care should be exercised to avoid over tightening fixings, which will result in damage to the plas tic package. 0V IC data (continued) Parameter Symbol Minimum Maximum Supply voltage pin 6 and pin 4 wrt pin 8 Bootstrap voltage pin 7 wrt pin 4 Output current repetitive peak Storage temp Thermal shut-down protection time Short circuit protection time Mute voltage pin 3 wrt pin 4 wrt = with respect to.
27. 2 shows the thermal derating curve. 28. The circuit also includes the previously mentioned bootstrap. 26 Internal block diagram 33 Audio IC projects TDA 1514A ιΐίτπτπππττπτ 1 1. 2. 3. 4. 5. 6. 7. 8. 9. 27 2 3 4 5 6 7 8 9 Non-inverting Input (#1) SOAR MUTE -VE Output +VE Bootstrap OV Non-inverting Input (#2) Inverting Input IC pinout If the circuit is used without the bootstrap, pin 7 must be connected to pin 6 and the associated components (resistors R4 and R5, and capacitors C5 and C6) removed; the power output will be reduced by approximately 4 watts.
58 ai Figure 2 . 11 shows the diagram of the peak/hold circuit; this circuit operates from a ±4 V to ±15 V, split rail sup ply only. Power supply connections are made to Pl(+V), P2(0V) and P3(-V). The input signal is applied between P4 and P9 and the output is taken between P6 and PIO. Connecting P7 to P14 holds the output voltage level constant until capaci tor C6 discharges. The output can be reset to 0 V by connecting P15 to 0 V. For some applications a directly coupled input may be required and in this case a link should be fitted in place of capacitor C4.