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Telephone call Voice Changer (TDA7052)
2016-02-13 08:03
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Voice manipulation device specially intended for props
Circuit diagram:
Parts:
P1______________10K Log. Potentiometer R1,R10__________10K 1/4W Resistors R2_______________1K 1/4W Resistor R3______________50K 1/2W Trimmer Cermet or Carbon R4,R6,R7,R14___100K 1/4W Resistors R5______________47K 1/4W Resistor R8______________68K 1/4W Resistor R9_______________2K2 1/2W Trimmer Cermet or Carbon R11_____________33K 1/4W Resistor R12_____________18K 1/4W Resistor R13_____________15K 1/4W Resistor C1,C2,C3,C8,C9_100nF 63V Polyester Capacitors C4______________10µF 25V Electrolytic Capacitor C5_____________220nF 63V Polyester Capacitor (Optional, see Notes) C6_______________4n7 63V Polyester Capacitor C7______________10nF 63V Polyester Capacitor C10____________220µF 25V Electrolytic Capacitor IC1___________LM358 Low Power Dual Op-amp IC2_________TDA7052 Audio power amplifier IC MIC1__________Miniature electret microphone SPKR______________8 Ohm Small Loudspeaker SW1____________DPDT Toggle or Slide Switch SW2,SW3________SPST Toggle or Slide Switches J1____________6.3mm or 3mm Mono Jack socket B1_______________9V PP3 Battery (See Notes) Clip for PP3 Battery
Although this kind of voice effect can be obtained by means of some audio computer programs, a few correspondents required a stand-alone device, featuring microphone input and line or loudspeaker outputs.
This design fulfills these requirements by means of a variable gain microphone preamplifier built around IC1A, a variable steep Wien-bridge pass-band filter centered at about 1KHz provided by IC1B and an audio amplifier chip (IC2) driving the loudspeaker. (TDA7052)
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