Audio IC Projects by Keith Brindley

By Keith Brindley

All of the tasks during this selection of information documents offers a construction block which constructors can use to scan with elements and use as a kick off point for additional improvement. This e-book will therefore supply a toolkit for development audio structures and circuits in accordance with available elements utilizing effortless options. each one undertaking relies round an built-in circuit equipment, chosen for e-book as a result of its exact positive aspects, since it is uncommon, since it electronically shrewdpermanent, or just simply because we expect readers should be attracted to it. the various units used are quite particular in functionality — in different phrases, the built-in circuit is designed and outfitted for one objective on my own. strength amplifier built-in circuits are reliable examples. Others, however, usually are not particular in any respect, and will be utilized in any variety of purposes. Bucket brigade hold up traces, say, can be utilized in all kinds of audio initiatives. 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 purely — they don't seem to be complete tasks in anyway — a broadcast circuit board song and structure are targeted. to assist readers, the published circuit forums (and kits of components for the various initiatives, too) can be found from Maplin, yet — as those circuits are for experimental use basically — all constructional info and any consequent fault discovering is left upto readers.

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14 220 nF polyester 2 (WW53H) (BX92A) (BX30H) (FF03D) (WW41U) (FF14Q) (WW33L) (BX80B) (JL57M) (BX78K) Semiconductor ICI TDA1514A-N7 1 (UK75S) Miscellaneous Pl-7 Optional 46 1 mm PCB pins printed circuit board constructors' guide insulator T0218 heatsink type 2E self-tap screw No. 4 x 3/8in 1 1 1 1 1 1 (FL24B) (GE64U) (XH79L) (UL74R) (HQ70M) (BF65V) 2 Pre-amplifiers and filters Featuring: LM13700 dual transconductance op-amp part 1 part 2 48 69 MFIO universal switched capacitor filter 92 SSM2044 voltage controlled filter 106 47 Audio IC projects LM13700 dual transconductance op-amp — part 1 The LM13700 is a dual transconductance operational amplifier featuring low distortion and a wide dynamic range.

2). c. s. c. 10; the power supply requirements of this circuit are similar to those of the state variable filter (4 V to 30 V single rail sup­ ply). A triangle wave output is available on P6 with a squarewave output on P8. The operating frequency of the oscillator is controlled by a voltage (30 V maximum) applied between P5 and 0 V.

7 to select the required input sensitivity. 2 50 ^^ 100 150 Tamb(oc) Thermal derating 35 Audio IC projects ««I 36 Power amplifiers Power supply requirements The integrated circuit has a wide supply range, the mini­ mum requirements being ±9 V to a maximum of ±30 V. 6. Printed circuit board A high quality glass fibre printed circuit board, with a silk screened component legend to aid construction is available. The printed circuit board has a 0 V star earth to minimise current return interaction from the speaker, amplifier and input, this will also help to maximise sound quality.

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