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Microphone
Circuits Page 2
Microphones: #-BC-FG-LM
N-V Last Updated on:
Monday, October 03, 2011 06:07 PM
Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
Computer Microphone - This circuit was submitted by Lazar Pancic
from Yugoslavia. The sound card for a PC generally has a microphone input,
speaker output and sometimes line inputs and outputs. The mic input is
designed for dynamic microphones only in impedance range of 200 to 600 ohms.
Lazar has adapted the sound card to use a common electret microphone using
this circuit....(electronic design added 6/07)
Dual Microphones Separate Voice from Noise - 06/23/94 EDN-Design
Ideas....The circuit in Fig 1 uses a pair of microphones to extract a voice
from a noisy background. You must mount electret microphones X1 and X2 on
the left and right sides of the user's chest. Sound sources not equidistant
from the microphones experience a phase shift. Because sound travels at 1120
ft/sec, the maximum phase shift for this design's..../....EDN is migrating
links. This link is not verified. Search the "title" + "EDN" for new link.
Dynamic Microphone Amplifier - A low noise pre-amplifier suitable for
amplifying dynamic microphones with 200 to 600 ohm output impedance….(electronic
diagram added 6/03)
Dynamic Microphone Preamp - Notice how the transistor bias current flows
through the microphone. A similar circuit can be used with an 8 ohm speaker but in
that case you would put it in place of the emitter resistor. (added 2/05)
[Reverse engineered schematic by Stepan Novotill]
Dynamic Microphone Preamplifier - A low noise pre-amplifier suitable for
amplifying dynamic microphones with 200 to 600 ohm output impedance....(electronic
design added 6/07)
Dynamic microphone to electret microphone input - Circuit which works as an
preamplifier which allows you to replace an electret microphone with a dynamic
microphone…..(Circuit design added 2/06)
ECM Mic Preamplifier - A microphone amplifier that may be used with either
Electret Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete
components…. [Designer Andy Collison]
FM Microphone - A micro-transmitter is so small and sensitive, it have only
8 easy-to-get parts and can be assembled in one hour….
FM Radio Microphone with Internal Loop Antenna (Area 50) - This article
began as a design guide for hyper cranial erogenic field generators, however, your
primitive earth brains are completely unable to respond to erogenic fields in the
100MHz region. I personally had a brain upgrade (for purely medical purposes of
course) so I am able to respond....(schematic / circuit added 4/08)
FM Voice Transmitter - This miniature transmitter is easy to construct and
it's transmissions can be picked up on any standard FM radio. It has a range of
up to 1/4-mile (Tony van Roon's 400 meters) or more, depending on the line-of-sight,
obstructions by large buildings,etc. It is great for room monitoring, baby
listening, nature research,....[Tony van Roon's circuit]
FM Wireless Mike - low power frequency modulated transmitter using two
transistors. The circuit works with 9v power supply....
