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Vi er blevet færdige med vores boominator (standard) men syntes stadig der mangler lidt volume på vores telefoner. Derfor skal vi have fat i en Forforstærker. Her fandt jeg frem til på forummet at fiio e3 og e5 er de mest brugte. Nu står vi i den situation at Roskilde er om 14 dage så bestilling fra USA på eBay er formentlig udelukket, og jeg kan ikke finde andre steder de sælges. Skulle der være nogen af jer der har en af de ovenstående liggende og vil sælge en, eller måske har et alternativ til hvad man ellers kunne gøre ud over at tage computere med :)

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danielclark Newbie

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Er i sikker på at i har brugt de rigtige modstande til jeres input gain? Taget fra samlingsguiden: You can set the gain of the input stage so that it matches your signal source. The gain is calculated as for a normal inverting operational amplifier: Input Gain=-1*Rfeedback/Rin [V/V]. The minus sign is due to the fact that the input stage is inverting. On the board, R2 and R4 are the Rin and R5 and R6 are the Rfeedback. With the kit, there are four 22 KΩ resistors and two 56 KΩ. With these resistor values, you can choose one of three different input sensitivities as shown in table 1. If you use other input resistors, they should be of a low noise type. Assembly instruction [TABLE] [TR] [TD] Rin [/TD] [TD] Rfeed bk [/TD] [TD] Input Gain [/TD] [TD] Suitable signal source [/TD] [/TR] [TR] [TD] 22 KΩ [/TD] [TD] 56 KΩ [/TD] [TD] -2.5 V/V [/TD] [TD] Portable MP3/CD player with built in volume control. [/TD] [/TR] [TR] [TD] 22 KΩ [/TD] [TD] 22 KΩ [/TD] [TD] -1 V/V [/TD] [TD] General use [/TD] [/TR] [TR] [TD] 56 KΩ [/TD] [TD] 22 KΩ [/TD] [TD] -0.4 V/V [/TD] [TD] Preamplifier with fairly high output signal [/TD] [/TR] [/TABLE]

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Jeg er Ikke 100 procent med på hvad du mener, men vi har sat 47ohm's modstande mellem piezo og hp10w'erne. Det lyder ikke som om det er dem du snakker om. Skal der modstande fra amp og videre eller?? Er lidt lost sorry :)

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Viktor Newbie

Viktor

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Er i sikker på at i har brugt de rigtige modstande til jeres input gain? Taget fra samlingsguiden: You can set the gain of the input stage so that it matches your signal source. The gain is calculated as for a normal inverting operational amplifier: Input Gain=-1*Rfeedback/Rin [V/V]. The minus sign is due to the fact that the input stage is inverting. On the board, R2 and R4 are the Rin and R5 and R6 are the Rfeedback. With the kit, there are four 22 KΩ resistors and two 56 KΩ. With these resistor values, you can choose one of three different input sensitivities as shown in table 1. If you use other input resistors, they should be of a low noise type. Assembly instruction [TABLE] [TR] [TD] Rin [/TD] [TD] Rfeed bk [/TD] [TD] Input Gain [/TD] [TD] Suitable signal source [/TD] [/TR] [TR] [TD] 22 KΩ [/TD] [TD] 56 KΩ [/TD] [TD] -2.5 V/V [/TD] [TD] Portable MP3/CD player with built in volume control. [/TD] [/TR] [TR] [TD] 22 KΩ [/TD] [TD] 22 KΩ [/TD] [TD] -1 V/V [/TD] [TD] General use [/TD] [/TR] [TR] [TD] 56 KΩ [/TD] [TD] 22 KΩ [/TD] [TD] -0.4 V/V [/TD] [TD] Preamplifier with fairly high output signal [/TD] [/TR] [/TABLE]
Tror ikke han har amp6/amp9
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Er i sikker på at i har brugt de rigtige modstande til jeres input gain? Taget fra samlingsguiden: You can set the gain of the input stage so that it matches your signal source. The gain is calculated as for a normal inverting operational amplifier: Input Gain=-1*Rfeedback/Rin [V/V]. The minus sign is due to the fact that the input stage is inverting. On the board, R2 and R4 are the Rin and R5 and R6 are the Rfeedback. With the kit, there are four 22 KΩ resistors and two 56 KΩ. With these resistor values, you can choose one of three different input sensitivities as shown in table 1. If you use other input resistors, they should be of a low noise type. Assembly instruction [TABLE] [TR] [TD] Rin [/TD] [TD] Rfeed bk [/TD] [TD] Input Gain [/TD] [TD] Suitable signal source [/TD] [/TR] [TR] [TD] 22 KΩ [/TD] [TD] 56 KΩ [/TD] [TD] -2.5 V/V [/TD] [TD] Portable MP3/CD player with built in volume control. [/TD] [/TR] [TR] [TD] 22 KΩ [/TD] [TD] 22 KΩ [/TD] [TD] -1 V/V [/TD] [TD] General use [/TD] [/TR] [TR] [TD] 56 KΩ [/TD] [TD] 22 KΩ [/TD] [TD] -0.4 V/V [/TD] [TD] Preamplifier with fairly high output signal [/TD] [/TR] [/TABLE]
Nej helt standard maxamp :)
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Hm.. Meget mærkeligt. Blev bare lidt halv skuffet da vi endelig fyrede op for boominatoren. Jeg laver en byggetråd så kan i følge lidt med, måske vi har lavet en fejl :) Men takker!

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danielclark Newbie

danielclark

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Jeg er Ikke 100 procent med på hvad du mener, men vi har sat 47ohm's modstande mellem piezo og hp10w'erne. Det lyder ikke som om det er dem du snakker om. Skal der modstande fra amp og videre eller?? Er lidt lost sorry :)
Bleh, da jeg byggede min boominator var amp6 nærmest standard :) Mit indlæg knytter sig til den forstærker, så bare glem hvad jeg har skrevet :D
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Så fik vi testet computer og telefon. Computer går til ca. 95% før den klikker og telefonen 80%. vi fandt løsningen. Vores volume knap og aux kabel havde begge løse forbindelser så de røg ud. Nu det spiller det bare! Noget andet jeg undre mig over er at når man når max (eller ca. 80%) på telefonen begynder lyden at klikke i hak, jeg ved godt man ikke skal skrue højre op end det, men bude lyden ikke bare begynde at forvrænge?

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