Mini Amplifier

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:

Clip On Belt Portable Mini 3W Electric Guitar Amp Amplifier Speaker Volume Tone
Clip On Belt Portable Mini 3W Electric Guitar Amp Amplifier Speaker Volume Tone
$20.89
Portable Mini 3W Electric Guitar Amp Amplifier Speaker Volume Tone Control
Portable Mini 3W Electric Guitar Amp Amplifier Speaker Volume Tone Control
$12.00
Clip On Belt Mini 3W Electric Guitar Amp Amplifier Speaker Volume Tone Control
Clip On Belt Mini 3W Electric Guitar Amp Amplifier Speaker Volume Tone Control
$20.89
Portable Mini 5W Electric Guitar Amp Amplifier Speaker Volume Tone
Portable Mini 5W Electric Guitar Amp Amplifier Speaker Volume Tone
$14.19
Portable Mini 5W Electric Guitar Amp Guitar Amplifier Speaker Volume Tone
Portable Mini 5W Electric Guitar Amp Guitar Amplifier Speaker Volume Tone
$24.69
Clip On Belt Mini 5W Electric Guitar Amp Amplifier Speaker Volume Tone
Clip On Belt Mini 5W Electric Guitar Amp Amplifier Speaker Volume Tone
$16.73
Donner Plexi Tone Mini Guitar Headphone Amp Amplifier with Rechargeable Battery
Donner Plexi Tone Mini Guitar Headphone Amp Amplifier with Rechargeable Battery
$31.99
Donner Guitar AMP 3W Rechargeable Mini Electric Amplifier Amplifiers Guitars
Donner Guitar AMP 3W Rechargeable Mini Electric Amplifier Amplifiers Guitars
$60.99
Donner Classic Rock Pocket Mini Guitar Headphone Amp Amplifier with Rechargeable
Donner Classic Rock Pocket Mini Guitar Headphone Amp Amplifier with Rechargeable
$31.99
Clip On Belt Mini 5W Electric Guitar Amp Amplifier Guitar Speaker Volume Tone
Clip On Belt Mini 5W Electric Guitar Amp Amplifier Guitar Speaker Volume Tone
$24.69
Mini Headphone Amp Classic Rock Pocket Guitar Amplifier Rechargeable Battery
Mini Headphone Amp Classic Rock Pocket Guitar Amplifier Rechargeable Battery
$25.77
Portable Guitar Mini Amplifier Clip Amp Headphone Speaker for Electric Guitar
Portable Guitar Mini Amplifier Clip Amp Headphone Speaker for Electric Guitar
$19.56
Mooer Little Tank D15 Modeling Mini Guitar Amplifier Head
Mooer Little Tank D15 Modeling Mini Guitar Amplifier Head
$290.52
VOX portable modeling guitar amplifier MINI3 G2 CL from Japan
VOX portable modeling guitar amplifier MINI3 G2 CL from Japan
$89.99
JOYO I Plug Guitar Headphone Pocket Amplifier Mini Amp Sound Effects
JOYO I Plug Guitar Headphone Pocket Amplifier Mini Amp Sound Effects
$28.89
Mooer Little Tank D15 Modeling Mini Guitar Amplifier Head 15 watts w Bluetooth
Mooer Little Tank D15 Modeling Mini Guitar Amplifier Head 15 watts w Bluetooth
$189.04
JOYO TOP GT Black Mini Bluetooth 40 Guitar Amplifier Amp Speaker 2  4W
JOYO TOP GT Black Mini Bluetooth 40 Guitar Amplifier Amp Speaker 2 4W
$118.65
JOYO TOP GT Orange Mini Bluetooth 40 Guitar Amplifier Amp Speaker 2  4W
JOYO TOP GT Orange Mini Bluetooth 40 Guitar Amplifier Amp Speaker 2 4W
$118.65
Danelectro Hodad II Mini Amp
Danelectro Hodad II Mini Amp
$35.66
Boss KTN MINI Mini Guitar Amplifier
Boss KTN MINI Mini Guitar Amplifier
$99.99
Mini Portable 3W Electric Guitar Amplifier Speaker Amp Black + Gold 9V
Mini Portable 3W Electric Guitar Amplifier Speaker Amp Black + Gold 9V
$20.17
Blackstar FLY 3 FLY3 Mini Guitar Amp Battery Powered Combo Portable Amplifier
Blackstar FLY 3 FLY3 Mini Guitar Amp Battery Powered Combo Portable Amplifier
$71.84
Vitoos Electric Guitar Plug Mini Headphone Amp Amplifier Heavy Rock Compact
Vitoos Electric Guitar Plug Mini Headphone Amp Amplifier Heavy Rock Compact
$20.88
Fender Electric Guitar Violin 10W Mini Portable Amplifier Musical Instrumant Amp
Fender Electric Guitar Violin 10W Mini Portable Amplifier Musical Instrumant Amp
$85.51
Fishman Loudbox MINI Acoustic Guitar Amp 60W 2 Ch Amplifier + 10ft Mogami Cable
Fishman Loudbox MINI Acoustic Guitar Amp 60W 2 Ch Amplifier + 10ft Mogami Cable
$329.95
Fishman Loudbox MINI Acoustic Guitar Amp 60W 2 Ch Amplifier + 3 10 TS Cables
Fishman Loudbox MINI Acoustic Guitar Amp 60W 2 Ch Amplifier + 3 10 TS Cables
$329.95
Fishman Loudbox MINI Acoustic Guitar Amp 60W 2 Ch Amplifier  3 10 TS Cables
Fishman Loudbox MINI Acoustic Guitar Amp 60W 2 Ch Amplifier 3 10 TS Cables
$329.95
Fishman Loudbox MINI Acoustic Guitar Amp 60W 2 Ch Amplifier  10ft Mogami Cable
Fishman Loudbox MINI Acoustic Guitar Amp 60W 2 Ch Amplifier 10ft Mogami Cable
$329.95


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