By Keith Brindley
All the initiatives during this number of information records presents a development block which constructors can use to scan with parts and use as a kick off point for additional improvement. This booklet will hence supply a toolkit for development audio structures and circuits according to on hand elements utilizing elementary innovations. each one undertaking relies round an built-in circuit machine, chosen for ebook as a result of its distinctive positive aspects, since it is rare, since it electronically shrewdpermanent, or just simply because we predict readers might be attracted to it. a few of the units used are really particular in functionality — in different phrases, the built-in circuit is designed and outfitted for one goal on my own. energy amplifier built-in circuits are stable examples. Others, nevertheless, should not particular in any respect, and will be utilized in any variety of functions. Bucket brigade hold up traces, say, can be utilized in every kind of audio initiatives. certainly, the circuit or circuits linked to each one built-in circuit machine mirror this. whereas all circuits given with all built-in circuits listed here are meant for experimental use in simple terms — they aren't complete initiatives whatsoever — a published circuit board tune and structure are particular. to aid readers, the published circuit forums (and kits of elements for a few of the tasks, too) can be found from Maplin, yet — as those circuits are for experimental use purely — all constructional info and any consequent fault discovering is left upto readers.
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Extra resources for Audio IC Projects
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. The input impedance of the amplifier module is 20 k de termined by resistor Rl. The gain of the amplifier is adjustable over the range 20 dB to 46 dB, determined by resistors R2 and R3.
1 Unity gain compensated 50 VAiS Electrical characteristics of LM13700 transconductance op-amp — specifications based on supply voltage ±15 V, amplifier bias current (labe) 500 μΑ, operating temperature 25°C and pins 2 and 5 open circuit (unless specified). Voltage controlled oscillator Effective voltage controlled oscillators can be realised using the LM13700. 5 shows an example of a volt age controlled oscillator circuit that will produce both square and triangle wave outputs. 5 Example of a voltage controlled triangle/squarewave oscillator 200 kHz.
The circuits that may be built using the printed circuit board are a voltage controlled state variable filter, a voltage controlled triangle/ squarewave oscillator, and a peak detector and hold cir cuit. Any one of the three circuits may be constructed using the same printed circuit board. 8. 9 shows the circuit diagram of the voltage con trolled state variable filter; this circuit operates from a single rail supply and may be powered from a wide range of voltages between 4 V and 30 V (maximum).