Microphone Sound Input Module

Our range of tiny modules are designed to make it easy for you to quickly add functionality to your projects. [Module List]
Post Reply
Futterama
Posts: 2
Joined: Sat Feb 06, 2016 10:42 am

Microphone Sound Input Module

Post by Futterama » Sat Feb 06, 2016 11:37 am

Hi forum,

I have just built the Microphone Sound Input Module: http://www.freetronics.com.au/products/ ... rXOnfkrLcs

I did my own PCB layout according to the schematic V1.1 (2013-05-24). The module works but I see some unexpected outputs on my scope.

I'm mostly interested in the Sound Pressure Level Output (to measure peak sound level) so I hooked up my scope to the output and started making noises. The module is driven from 4xAA batteries outputting 5.1V.

1. The first thing I noticed was that the Sound Pressure Level Output is not a flat line on the scope, it varies with the frequency of noise (me singing tones). This will make it harder to measure the sound pressure level with a microcontroller.
Image


2. I also noticed that no matter how loud a noise I was making, the Sound Pressure Level Output would never reach more that around 4V even though the input voltage is 5.1V. So I took a look at the Amplified Audio Output and saw that the positive going wave would clip before the negtive going wave. I verified the VCC center ref to be 2.55V which is exactly 50% of VCC. This does not seem right to me. Is this because the TLC272 is not rail-to-rail output capable? If this is the case, why would we need 50% VCC ref? According to the datasheet the "High-level output voltage" is typ 3.8V with 5V VCC, so the 50% VCC should probably be more like 38% VCC to take the limited TLC272 output voltage into consideration.
Image


3. Sound Pressure Level Output during my air compressor running under my work table.
Image


4. Sound Pressure Level Output with noise from my air horn.
Image


5. Amplified Audio Output with noise from my air horn.
Image


6. Amplified Audio Output with noise from my air horn zoomed in so the clipping can be seen. How can the gain be adjusted so the module is less sensitive to sound pressure level and a higher volume sound can be measured?
Image


7. Sometimes I experience some self-resonance or something, like others have reported. The LED stays on and I can measure this high frequency signal (around 31.2kHz) on the Amplified Audio Output.
Image

I hope you can help me a bit here, using microphones is very new to me so I just picked the circuit that seemed to be the best, but it still has some problems to be solved before I can use it.

Thanks.
Last edited by Futterama on Thu Mar 09, 2017 8:35 am, edited 1 time in total.

angusgr
Freetronics Staff
Freetronics Staff
Posts: 853
Joined: Tue Apr 09, 2013 11:19 pm
Location: Melbourne, Australia
Contact:

Re: Microphone Sound Input Module

Post by angusgr » Wed Feb 10, 2016 2:28 am

Hi Futterama,

Thanks for the comments and the very useful oscilloscope captures.

Regarding the SPL output varying with frequency, the audio output is low pass filtered to produce the SPL output but - as you noted - no filter is perfect. There is also a tradeoff between how aggressively the design filters, and how quickly it can detect attack/release of a particular sound. If you need a lower frequency filtering then you could add additional software or hardware low pass filtering stages (for instance software oversampling and averaging), at the expense of response time.

Regarding clipping on the high side, at a glance I think you're correct - this is a flaw with the module design. I've raised an issue on the design's github repository as a reminder for the next time the module is revised. If you were keen to extract the full output range then you could swap R5 or R6 in order to move the zero point.

Regarding sensitivity, the gain on the MIC module is unfortunately set in the hardware and not user configurable. You will need a more sophisticated circuit if you need to be able to dial in a particular sensitivity for your application, sorry about that.

Angus

Futterama
Posts: 2
Joined: Sat Feb 06, 2016 10:42 am

Re: Microphone Sound Input Module

Post by Futterama » Wed Feb 10, 2016 9:54 am

Hi Angus,

Thanks for the response.

The freetronics module was a good first build for learning, I have since moved on to more sophisticated circuits with 4 rail-to-rail op-apms which are better suited for my needs.

But thanks for the free circuit, this got me going in the right direction ;)

Best regards,
Futterama

redwoodword
Posts: 1
Joined: Thu Mar 09, 2017 1:17 am

Re: Microphone Sound Input Module

Post by redwoodword » Thu Mar 09, 2017 1:41 am

Thanks Futterama. This helps to explain why I'm not getting a full range of values out of the Sound Pressure Level pin. Am I understanding correctly that the R5 and R6 values need to change to get the full range? Do we know what these resistor values should be to get the full range? Any plans to update this module with these changes in the near future?



clibin009
Posts: 563
Joined: Mon Oct 23, 2017 2:57 am

20180203caihuali

Post by clibin009 » Sat Feb 03, 2018 2:16 am

oakley sunglasses
kate spade outlet
michael kors outlet online
true religion jeans
air huarache
michael kors outlet
true religion jeans
polo outlet
uggs outlet
uggs outlet
uggs outlet
longchamp handbags
polo ralph lauren
moncler outlet
basketball shoes
nike store uk
nike trainers
oakley sunglasses
ysl outlet
michael kors outlet
chrome hearts outlet
cheap football shirts
oakley sunglasses
ray ban sunglasses
canada goose outlet
ralph lauren polo shirts
cheap jordans
canada goose jackets
polo ralph lauren
true religion jeans
coach factory outlet
longchamp solde
air jordan 4
oakley sunglasses
cartier outlet
michael kors
jordan shoes
moncler outlet
nike air max 90
ugg outlet
chrome hearts
christian louboutin outlet
coach outlet
coach outlet
true religion jeans
uggs outlet
polo ralph lauren
pandora jewelry
pandora charms
coach outlet
longchamp handbags
coach outlet
michael kors outlet
coach factory outlet
canada goose outlet
ferragamo outlet
puma outlet
christian louboutin outlet
polo ralph lauren
ugg boots clearance
adidas wings
cheap nfl jerseys
ferragamo outlet
longchamp pas cher
true religion jeans
ray ban sunglasses
canada goose outlet
lacoste soldes
coach outlet store online
ray ban sunglasses
polo ralph lauren
kate spade outlet
true religion jeans
canada goose outlet
vans shoes
true religion outlet
polo outlet
adidas uk
oakley sunglasses wholesale
louboutin shoes
tory burch outlet
canada goose jackets
canada goose outlet
oakley sunglasses
longchamp bags
oakley sunglasses
polo outlet
ray ban sunglasses
ugg outlet
ray ban sunglasses
coach factory outlet
oakley sunglasses wholesale
lacoste polo shirts
canada goose jackets
cheap snapbacks
ugg outlets
hermes belt
coach outlet
uggs outlet
mulberry handbags
polo outlet
polo outlet
ugg cyber monday
ugg boots
rayban sunglasses
oakley sunglasses
fitflops shoes
polo ralph lauren
ugg boots clearance
canada goose jackets
nike air max 2015
air max 90
air max 90
coach outlet
ugg boots
pandora charms
ugg outlet
reebok trainers
fitflops sale clearance
oakley sunglasses
fitflops sale clearance
new balance pas cher
michael kors outlet
ugg outlet
jordan shoes
michael kors outlet
michael kors outlet
nfl jersey wholesale
supreme clothing
polo ralph lauren
michael kors outlet
jordan shoes
pandora jewelry
pandora charms
nike shoes
true religion jeans
canada goose jackets
tory burch outlet
air jordan pas cher
oakley sunglasses
kate spade outlet
fred perry polo shirts
christian louboutin outlet
michael kors handbags
michael kors handbags
christian louboutin outlet
marc jacobs outlet
oakley sunglasses
true religion jeans
mont blanc pens
ralph lauren polo
coach factory outlet
coach outlet
polo ralph lauren
polo outlet
oakley sunglasses
coach outlet
ray ban sunglasses
polo outlet
michael kors outlet
michael kors outlet
nike trainers
uggs
ugg outlet
fitflops
ugg boots
coach factory outlet
ugg boots
ferragamo shoes
ray ban sunglasses
ugg outlet
michael kors outlet online
oakley sunglasses
ugg outlet
michael kors outlet
polo outlet
tory burch outlet
michael kors outlet
michael kors outlet
chicago blackhawks jerseys
kate spade outlet
prada sunglasses
ugg boots
adidas nmd
ray ban sunglasses
pandora outlet
ferragamo outlet
barbour outlet
polo shirts
christian louboutin online
fitflops sale clearance
coach outlet online
longchamp handbags
nike shoes
canada goose outlet
christian louboutin outlet
michael kors
pandora outlet
mbt shoes
nike factory outlet
ugg outlet
jordan shoes
ray ban sunglasses
pandora outlet
yeezy boost 350
longchamp outlet
michael kors outlet online
canada goose jackets
fitflops sale
oakley sunglasses
kate spade outlet
canada goose jackets
ralph lauren polo
cheap nfl jerseys
adidas nmd
asics pas cher
pandora charms
montblanc pens
oakley sunglasses
ugg outlet
air max 90
coach outlet
kobe bryant shoes
ugg boots clearance
canada goose jackets
canada goose jackets
polo ralph lauren
ugg outlet
ed hardy clothing
christian louboutin outlet
lebron james shoes
coach outlet
pandora outlet
ugg outlet
nike shoes
canada goose jackets
cazal sunglasses
hermes outlet
canada goose outlet
coach outlet
coach outlet
coach outlet
coach outlet
nfl jerseys
michael kors outlet
true religion jeans
tory burch outlet
mcm outlet
polo ralph lauren
canada goose outlet
jordan shoes
uggs outlet
nike blazer pas cher
bottega veneta outlet
canada goose outlet
burberry outlet
kobe 9
ray ban sunglasses
christian louboutin outlet
ralph lauren outlet
christian louboutin shoes
polo ralph lauren
jordan shoes
canada goose outlet
michael kors outlet
nike outlet
michael kors bags
swarovski outlet
coach outlet
michael kors
rayban sunglasses
fitflops
mulberry handbags
canada goose coats
hermes birkin
longchamp handbags
michael kors outlet
swarovski outlet
coach outlet online
tory burch outlet
longchamp outlet
polo ralph lauren
coach factory outlet
pandora outlet
coach factory outlet
michael kors handbags
true religion outlet
adidas outlet store
true religion outlet
ugg outlet
michael kors outlet
supreme clothing
polo ralph lauren
cheap snapbacks
longchamp solde
cheap jordans
ugg boots clearance
kobe shoes
air jordan pas cher
oakley sunglasses
asics pas cher
true religion uk
coach outlet online
michael kors outlet
ugg outlet
canada goose outlet
true religion jeans
coach handbags
nike outlet
fitflops outlet
ugg outlet
pandora charms
burberry outlet
canada goose parka
canada goose jackets
swarovski outlet
canada goose jackets
nike trainers
birkenstock outlet
michael kors outlet
michael kors handbags
mont blanc pens
michael kors outlet
prada shoes
mont blanc pens
prada outlet
christian louboutin shoes
nhl jerseys
oakley sunglasses
ugg outlet
longchamp pliage
lakers jerseys
air max trainers
ralph lauren polo shirts
polo ralph lauren
cheap jerseys
kate spade outlet
giuseppe zanotti outlet
nfl jerseys
michael kors outlet
polo ralph lauren
canada goose outlet
michael kors handbags
coach outlet online
michael kors handbags
christian louboutin outlet
nike roshe
canada goose jackets
ferragamo outlet
canada goose outlet
soccer jerseys
supreme clothing
polo outlet
mulberry outlet
ray ban sunglasses
nfl jerseys wholesale
swarovski crystal
thomas sabo
fitflops shoes
canada goose outlet
converse shoes
pandora outlet
pandora outlet
michael kors outlet
oakley sunglasses
air max 1
salomon shoes
mont blanc pens
coach outlet online
burberry outlet
nfl jerseys
michael kors outlet
ralph lauren pas cher
air max uk
soccer jerseys
longchamp outlet
ugg outlet
nike store
coach outlet
cheap nhl jerseys
polo ralph lauren
nike pas cher
ray ban sunglasses
michael kors
polo ralph lauren
mulberry bags
ugg outlet
cheap mlb jerseys
true religion jeans
christian louboutin outlet
mulberry handbags
michael kors outlet
ralph lauren polo
cleveland cavaliers jersey
ferragamo shoes
jordan shoes
air max 90
ugg boots
coach outlet
prada handbags
christian louboutin outlet
true religion outlet
canada goose jackets
ray ban sunglasses
michael kors outlet
cheap jerseys
kate spade outlet
canada goose jackets
uggs outlet
coach handbags
links of london
oakley sunglasses
oakley sunglasses
tory burch outlet
oakley sunglasses
coach outlet
moncler jackets
cheap mlb jerseys
swarovski outlet
oakley sunglasses
polo ralph lauren
oakley sunglasses
michael kors outlet
ugg outlet
pandora charms
adidas trainers
cheap jordans
futbol baratas
mulberry handbags
nfl jerseys
ray ban sunglasses
kate spade outlet
uggs outlet
nike pas cher
nike air max
mulberry outlet
ray ban sunglasses
denver broncos jerseys
nike shoes
canada goose outlet
tory burch outlet
nba jerseys
ray ban sunglasses
dansko shoes
pandora charms sale clearance
canada goose outlet
canada goose outlet
nike free 5
ugg boots clearance
coach outlet
herve leger outlet
ralph lauren polo shirts
reebok outlet store
michael kors wallets
mulberry sale
asics shoes
burberry outlet
new balance shoes
coach outlet canada
birkenstock sandals
mulberry bags
coach outlet online
christian louboutin shoes
coach outlet online
hermes outlet
michael kors outlet
michael kors outlet
nike roshe one
swarovski crystal
coach outlet
ugg outlet
ray ban sunglasses
moncler outlet
cheap nfl jerseys
air huarache
yeezy boost
ecco shoes
nike foamposite
cheap jordans
canada goose outlet
football shirts
ray-ban sunglasses
tory burch outlet
coach outlet
oakley sunglasses
ray ban sunglasses
coach outlet online
supreme clothing
nike shoes
kevin durant shoes
pandora charms
moncler jackets
ferragamo outlet
canada goose outlet
pandora outlet
tods outlet
nike air force 1
michael kors uk
nike shoes
new balance pas cher
ugg boots
supra shoes
christian louboutin shoes
ugg outlet
ray ban sunglasses
canada goose outlet
mac makeup
coach outlet online
coach canada
ugg black friday
nba jerseys
denver broncos jerseys
michael kors outlet
michael kors outlet
ray bans
valentino outlet
soccer shoes
20180203caihuali

jeje222
Posts: 89
Joined: Tue Feb 06, 2018 6:20 am

Re: Microphone Sound Input Module

Post by jeje222 » Tue Feb 06, 2018 7:53 am

nike air force 1
jordan 12
zx flux
cat boots
nike zoom
hermes belt
kobe 9
air max
kyrie 4
Kanye West shoes
yeezys
nike max
nike running shoes
jordan retro
kobe 11
yeezy boost 350 v2
nike flyknit racer
nhl jerseys
yeezy boost 350
retro jordans
hermes belts for men
michael kors handbags
vans shoes
led shoes
adidas superstar shoes
cheap jordans
nike air max 90
air jordan shoes
van cleef
birkin bag
yeezy shoes
adidas shoes
nike zoom
air force 1
adidas superstar
michael kors outlet
damian lillard shoes
adidas store
off white
kobe 9
new england patriots jersey
moncler jackets
michael kors outlet
nfl jerseys
chrome hearts
air max 90
adidas stan smith
jordan shoes
cheap jordans
nike huarache
kyrie 3 shoes
chrome hearts online
nike air presto
yeezy boost
chrome hearts
jordan shoes
yeezy 700
yeezy shoes
curry 3 shoes
nike huarache
curry 4[/b]
birkin bag
jordan retro 6
jordan 13
nike sneakers
nike lebron soldier 11
lebron james shoes
balenciaga shoes
real jordans for sale cheap
westbrook shoes
nike air force
yeezy boost 350 v2
hermes handbags
air presto
kyrie 4
pandora charms
paul george shoes
nike football boots
nike roshe run
adidas yeezy boost
vibram fivefingers
adidas online shop
michael kors handbags
nba jerseys
hermes belt
yeezy boost 350
nike flyknit racer
prada sunglasses
fitflops
nike sneakers for women
nike roshe run
air max 90
lebron 14 shoes
pandora bracelet
chrome hearts
jordan shoes
off white clothing
nike flyknit
longchamp sale
russell westbrook shoes
jordan 11
yeezy boost 350
jordan shoes
true religion outlet
longchamps
adidas stan smith shoes
nike foamposite
nike cortez men
michael jordan shoes
calvin klein outlet online
tory burch shoes
true religion
adidas zx flux
adidas nmd
tom ford sunglasses
brady jersey
adidas tubular
golden goose
michael kors
kobe shoes
pandora jewelry
lacoste polo
http://www.kobebasketballshoes.us.com
adidas eqt
goyard handbags
kyrie 3
john wall shoes
led shoes
derrick rose shoes
nike free run
basketball shoes
nike shoes for men
michael kors outlet online
yeezy boost 350 v2
longchamp
bape hoodie
cheap nfl jerseys
hogan outlet
patriots jersey
lebron 13 shoes
nike air max
van cleef arpels
james harden shoes
adidas nmd runner
chrome hearts online
cheap jordans
cheap jordans
longchamp handbags
nike air zoom
birkin bag
kobe shoes
100% real jordans for cheap
adidas outlet online
curry 4
nike air max 90
adidas online shop
nike roshe uk
af1
lebron 13
roshe shoes
michael kors factory outlet
kobe shoes
longchamp handbags
pandora jewelry
longchamp handbags
kevin durant shoes
tory burch outlet
nmd
adidas nmd r1
pure boost
paul george shoes
dior sunglasses
true religion
jordan 11 retro
nike polo
nike air huarache
longchamp bags
mlb jerseys
hogan outlet online
yeezy shoes
converse outlet
cartier bracelet
goyard bags
timberland boots
adidas eqt
nmd
off white hoodie
air jordan
yeezy boost
ysl handbags
longchamp longchamps
michael kors outlet
lebron soldier 10
nike air zoom
converse shoes
fitflops
yeezy boost 350
cheap mlb jerseys
nike roshe
adidas outlet
nike air max
kyrie shoes
tom ford eyewear
air jordans
adidas tubular
adidas ultra boost
nike dunks
kd shoes
nike zoom running shoe
nmd
converse outlet store
tory burch shoes
air jordan shoes
ferragamo belt
adidas outlet online
roshe run
adidas eqt support
nike shoes
authentic jordans
adidas pure boost
bape hoodie
nike air max 2018[/b]
asics shoes
yeezy boost
cheap jordans
nike air max
adidas stan smith
hermes belt
air max 2018[/b]
goyard handbags
vans shoes
adidas nmd
louboutin shoes uk
stephen curry shoes
links of london outlet store
nike air huarache
asics running shoes
adidas outlet
adidas neo
yeezy boost 350
michael jordan shoes
adidas ultra boost
adidas ultra boost
nike air max 2017
adidas outlet
kobe 11
gucci belts[/b]
yeezy boost 700
nike outlet
longchamp
yeezy boost 350 v2
lebron shoes
adidas gazelle
links of london sale
cheap jordans
adidas ultra boost uncaged
yeezys
cheap nba jerseys
adidas iniki
off white clothing
ferragamo belts
adidas yeezy
nike polo shirts
calvin klein outlet
nike sneakers for men
jordan 6
louboutin shoes
yeezy boost
lacoste outlet
yeezy
longchamp bags
yeezy shoes
michael kors uk
nike roshe one
yeezy boost 350
michael kors handbags
nike hyperdunk
adidas superstar shoes
lebron 14
michael kors handbags
nike air huarache
nike dunk shoes
kate spade outlet
nike mercurial
vapormax
converse outlet
michael kors outlet online
led shoes for kids
dior glasses
kate spade handbags
ultra boost
asics kayno
air jordan 13
golden goose sneakers
red bottoms
adidas ultra
nike huarache
pandora charms
yeezy shoes
lacoste online shop
cheap basketball shoes
longchamp outlet
nike flyknit
longchamp bags
true religion jeans
russell westbrook shoes
nike basketball shoes
air force 1
iniki
adidas stan smith sneakers
prada glasses
michael kors outlet store
reebok outlet
lebron 15
christian louboutin
http://www.kobeshoes.uk
balenciaga sneakers
lacoste outlet
light up shoes
nike outlet store online shopping
yeezy boost 350
yeezy boost
jordan retro 12
retro jordans
vans outlet
lebron soldier 11
ysl bags
fenty puma
adidas yeezy
balenciaga sneakers
michael kors outlet online
kobe basketball shoes
kate spade outlet online
yeezy shoes
atlanta falcons jersey
nike hyperdunk 2017
reebok shoes
adidas tubular shadow
adidas tubular shadow
longchamp bags
golden goose sneakers
jordan 4
kyrie irving shoes
kobe byrant shoes
curry 3
nike huarache
yeezy boost 350
goyard bags
kobe basketball shoes
vibram five fingers
links of london
balenciaga shoes
adidas tubular
links of london
adidas tubular
vapor max
air jordan
lebron 15
adidas superstar
kobe sneakers
timberland outlet
nike roshe run
basketball shoes
nike air force 1
yeezy
christian louboutin shoes
red bottom shoes
falcons jersey
nike free
golden goose
jordan shoes
curry shoes
nike air force
fitflops sale clearance
harden shoes
nike lebron soldier 10
supreme clothing
air yeezy
crazy explosive
adidas nmd
moncler outlet
golden goose outlet
michael kors outlet
adidas crazy explosive
supreme hoodie
caterpillar boots
asics gel kayano
adidas nmd
gucci belt[/b]
retro jordans
100% real jordans for cheap
adidas nmd
hermes birkin
yeezy boost 350 v2
golden goose
longchamp outlet
michael kors outlet
nike cortez


Post Reply

Who is online

Users browsing this forum: No registered users and 2 guests