Mini Amplifier

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How do you make a mini amplifier at home?

I need to amplify the sound from a stethoscope so that it is audible from a distance. Is there any way to do this for under $50 without too much bulk? Any links to a tutorial for a similar project would be greatly appreciated

If you have a stethoscope, remove the sensing end from the ear tubes.
Fit a little electret microphone to the end of the sensing end tube, and connect it to a sensitive amplifier. Do you or someone you know understand enough about electronics to come up with an amplifier suitable for your purpose?
A small battery powered preamplifier could be used, with its output feeding into one channel of a stereo amplifier or similar.
Electret microphones need a voltage source to function.

Find Mini Amplifier On eBay Below:

Danelectro Hodad II DH 2 Mini Amp
Danelectro Hodad II DH 2 Mini Amp
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New hot portable vitoos guitar amplifier electric guitar mini headphone amp rock
New hot portable vitoos guitar amplifier electric guitar mini headphone amp rock
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JOYO JA 03 Mini Guitar Amplifier Amp Pocket Powerful Acoustic Sound G6E9
JOYO JA 03 Mini Guitar Amplifier Amp Pocket Powerful Acoustic Sound G6E9
$12.65
Peavey Mini Max 500 Bass Guitar Head Amplifier
Peavey Mini Max 500 Bass Guitar Head Amplifier
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New Hotone Thunder Bass Nano Legacy Series Mini Amplifier Head w Free Items
New Hotone Thunder Bass Nano Legacy Series Mini Amplifier Head w Free Items
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Vox Mini3 G2 Classic 3W Battery Powered Modeling Amplifier GENTLY USED CLEARANCE
Vox Mini3 G2 Classic 3W Battery Powered Modeling Amplifier GENTLY USED CLEARANCE
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Boss Katana Mini Amp GENTLY USED
Boss Katana Mini Amp GENTLY USED
$93.06
Quilter Labs 101 MINI HEAD 100 Watt Micro Ultra Compact Guitar Amplifier NEW
Quilter Labs 101 MINI HEAD 100 Watt Micro Ultra Compact Guitar Amplifier NEW
$299.00
New Quilter 101 Mini Guitar Amplifier Head
New Quilter 101 Mini Guitar Amplifier Head
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VOX MINI 3 Modeling Black Combo Amplifier Original VOX AC Power Adapter Cable
VOX MINI 3 Modeling Black Combo Amplifier Original VOX AC Power Adapter Cable
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Vox MV50 Rock Mini Amp Head GENTLY USED
Vox MV50 Rock Mini Amp Head GENTLY USED
$185.36
Fishman Loudbox Mini Charge Battery Powered Acoustic Guitar amplifier AUTH DEAL
Fishman Loudbox Mini Charge Battery Powered Acoustic Guitar amplifier AUTH DEAL
$499.00
Peavey Classic 20 MH Mini Head Guitar Amplifier Amp Classic20MH Classic20 BStock
Peavey Classic 20 MH Mini Head Guitar Amplifier Amp Classic20MH Classic20 BStock
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Orange Amps Crush Mini Combo Guitar Micro Amplifier 9V Battery Powered 3W 8 ohm
Orange Amps Crush Mini Combo Guitar Micro Amplifier 9V Battery Powered 3W 8 ohm
$69.00
AROMA Mini Portable 5W Guitar Amp Amplifier Recorder Speaker with USB Cable to
AROMA Mini Portable 5W Guitar Amp Amplifier Recorder Speaker with USB Cable to
$159.96
DANELECTRO HONEYTONE 10 WATT MINI AMPLIFIER BLACK HTA BLK COOL RETRO LOOK
DANELECTRO HONEYTONE 10 WATT MINI AMPLIFIER BLACK HTA BLK COOL RETRO LOOK
$53.37
DANELECTRO HONEYTONE 10 WATT MINI AMPLIFIER NIFTY AQUA HTA FA COOL RETRO LOOK
DANELECTRO HONEYTONE 10 WATT MINI AMPLIFIER NIFTY AQUA HTA FA COOL RETRO LOOK
$53.37
Orange Amps Crush Mini Combo Guitar Amplifier 9V Battery Powered 3 Watt 8 ohm
Orange Amps Crush Mini Combo Guitar Amplifier 9V Battery Powered 3 Watt 8 ohm
$69.00
Pyle Pro 4 Channel Stereo Headphone Amplifier Audio Home Black Mini Amp Portable
Pyle Pro 4 Channel Stereo Headphone Amplifier Audio Home Black Mini Amp Portable
$27.45
Blackstar Fly 3 Limited Edition Mini Amplifier Green
Blackstar Fly 3 Limited Edition Mini Amplifier Green
$108.40
Peavey Classic 20 Mini Head Guitar Amplifier Head Free Shipping
Peavey Classic 20 Mini Head Guitar Amplifier Head Free Shipping
$427.89
Peavey Classic 20 Mini Head Guitar Amplifier Head New Free Shipping
Peavey Classic 20 Mini Head Guitar Amplifier Head New Free Shipping
$599.99
Baroni Lab Doug Aldrich DLA Mini Amp 120w 2018 Guitar Amplifier Pedal Black
Baroni Lab Doug Aldrich DLA Mini Amp 120w 2018 Guitar Amplifier Pedal Black
$259.95
Danelectro N10B Honey Tone Mini Amp in Burgundy
Danelectro N10B Honey Tone Mini Amp in Burgundy
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Donner Accustic Electric Guitar Mini Amplifier Headphone 35mm Jack Classic Rock
Donner Accustic Electric Guitar Mini Amplifier Headphone 35mm Jack Classic Rock
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Danelectro Electric Guitar Mini Amplifier Aqua N10A Amplifiers Guitars Basses
Danelectro Electric Guitar Mini Amplifier Aqua N10A Amplifiers Guitars Basses
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LYON by Washburn LA5 5 watt guitar mini AMP
LYON by Washburn LA5 5 watt guitar mini AMP
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VOX AP2CR amPlug 2 Headphone Mini Practice Guitar Amplifier Amp Classic Rock AP2
VOX AP2CR amPlug 2 Headphone Mini Practice Guitar Amplifier Amp Classic Rock AP2
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