CONDENSATOR MICICROFONE
need often arises for a sensitive sound pick-up device, whether it is to be used as a simple microphone or a more exotic device as a sound operated alarm, a bugging device or a sound operated flash (for stop action photography) the list is quite unending.
The circuit given employs a condenser microphone as the transducer. Since output of the condenser microphone is quite low, it usually has an FET amplifier built into the case.
Vezi și
Romania traiește , încă , din inertia bogățiilor create in Epoca Comunistă
Europa privită din viitor
Hrana vie
Planurile in derulare sunt o munca in progres, veche de sute de ani
Duda a pus mâna pe Casa Regală
Nu poti multiplica bogatia divizand-o !
Evolutia Laptop - Cântărea 5,44 kg
În vremea monarhiei, taranii romani reprezentau 90% din populatie si nu aveau drept de vot.
Miracolul din Noua Zeelandă - LYPRINOL
Locul unde Cerul se uneste cu Pamantul
Fii propriul tău nutriționist
Maya ramane o civilizatie misterioasa
Slăbești daca esti motivat
Serbet de ciocolata
Medicament retras - folosit în diabet
Brexit-ul - Spaima Europei
Virusul Misterios
Sistemele solare - apă caldă
Aparitia starii de insolventa
TRUMP ESTE PRESEDINTE
Despre islamizarea Europei. O publicăm integral. Și fără comentarii.
Tavalugul Marelui Razboi - Globaliyarea - Asasinii Economici
PARTS LIST | |
R1 | 1.2k |
R2 | 2.7k |
R3 | 33k |
R4 | 6.8k |
R5 | 3.3k |
R6 | 100 |
R7 | 560k |
R8 | 4.7k |
R9 | 1k |
VR1 | 10k |
C1 | 47µF 10V |
C2 | 0.1µF |
C3 | 0.1µF |
C4 | 220µF 10V |
C5 | 10µF 10V |
Q1 | BC149C |
Q2 | BC147B |
MIC | Condenser Mike |
This amp is powered by the R1, R2 resistor network.
The output of condenser microphone is fed to a two stage amplifier. Transistor T1 (BC149C) utilising current series feedback forms the first stage. The second stage comprising transistor T2 (BC147B) is connected in the voltage shunt feedback configuration. These two stage provide sufficient gain to pick up even the slightest whisper.
The circuit requires a 4.2 volt supply.This may be obtained, as in the prototype, with a 1kΩ (R9) resistor as shown in the diagram. The value of this resistor may be altered. to suit a supply voltage other than 6 volts.
Condenser Mike Pin Configuration
Output of the microphone amplifier can be made variable by connecting a 10kΩ potentiometer / Preset as shown.
Circuit’s gain can be increased by reducing the value of R6 to 47Ω or 22Ω, depending on the input sensitivity of the main amplifier system. Increase in gain was also observed by using 3V supply and eliminating R9 altogether. The microphone should be housed in a small round enclosure.
http://ziarulorizont.info/wordpress/2013/03/totul-despre-noile-taxe-din-agricultura/
Niciun comentariu:
Trimiteți un comentariu