Circuit : Andy Collinson
Email: anc@mitedu.freeserve.co.uk
Description:
A low noise pre-amplifier suitable for amplifying dynamic microphones with 200 to 600 ohm output impedance.
Notes:
This is a 3 stage discrete amplifier with gain control. Alternative transistors such as BC109C, BC548, BC549, BC549C may be used with little change in performance. The first stage built around Q1 operates in common base configuration. This is unusuable in audio stages, but in this case, it allows Q1 to operate at low noise levels and improves overall signal to noise ratio. Q2 and Q3 form a direct coupled amplifier, similar to my earlier mic preamp.
Source: http://www.mitedu.freeserve.co.uk/Circuits/Audio/dyn_mic/dyn_mic.htm
Related Links
See other circuit on preamp circuit
See other circuit on microphone preamplifier
See other circuit on Pre Mic
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Pre MIC (microphone preamplifier) 3 CH by IC LM348
Two Microphone Preamplifier by BC109
Dynamic Microphone Preamp Mono by Transister C945 (with PCB)
Dynamic Microphone Preamp
This entry was posted on Saturday, April 28th, 2007 at 10:23 pm and is filed under Audio - Alarm, audio article, Power Amplifier.
