Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
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The entries are in alphabetical order by magazine name and then in chronological sequence.
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Listen to the electrical signals generated by your heart and muscles with this amplifier which will provide a gain of about 300,000.
CQ. THE RADIO AMATEUR'S JOURNAL Mar 1979 (v.35#3) pg. 106

Automobile mechanic's electronic stethoscope makes it easier to locate annoying noises. Used with headphones to amplify low-level sounds, block out background noise, and control volume and tone.
ELECTRONICS HOBBYISTS HANDBOOK Fall 1995 pg. 63

Electronic stethoscope and cardiac rate meter. Battery-operated unit incorporates a stethoscope and direct-reading heart-rate meter.
ELECTRONICS WORLD Jul 1967 (v.78#1) pg. 30

Electronic stethoscope uses a special, super-sensitive pickup made from a small loudspeaker, a copper penny, and a sewing needle. Use it to pinpoint sources of vibration.
HANDS-ON ELECTRONICS Feb 1987 (v.4#2) pg. 93

Modify an ordinary stethoscope to include a small electret microphone so that erratic heart beat can be recorded on a cassette.
HANDS-ON ELECTRONICS Dec 1987 (v.4#12) pg. 98

Electronic stethoscope, with an attached probe, can be used to amplify abnormal or small sounds coming from mechanical devices (motors, bearings, cameras, etc.)
MECHANIX ILLUSTRATED #527 Apr 1972 (v.68) pg. 120

Electronic stethoscope. Sound amplifier helps pinpoint troubles in machinery, track down mechanical vibrations, and listen to weak sounds. Est. cost: $10.
POPULAR ELECTRONICS [1] May 1967 (v.26#5) pg. 33

Listen to your heart with Doppler ultrasound. Ultrasonic stethoscope lets you hear snapping of heart valves and blood-flow sounds.
POPULAR ELECTRONICS [1] Aug 1975 (v.8#2) pg. 60

Electronic "knock detector" helps trace down the source of strange knocking noises in electro-mechanical devices, such as automobile engines.
POPULAR ELECTRONICS [2] Aug 1989 (v.6#8) pg. 81

Build an electronic stethoscope to find annoying noises in automobiles. Uses an electret microphone element to pick up the noise and an amplifier, tone control and headphones to focus on the sound being traced.
POPULAR ELECTRONICS [2] Apr 1995 (v.12#4) pg. 46

Electronic stethoscope uses a piezo disc as the transducer (instead of a microphone). Can also be used to detect sources of AC voltages.
POPULAR ELECTRONICS [2] Apr 1996 (v.13#4) pg. 63
Correction POPULAR ELECTRONICS [2] Jul 1996 (v.13#7) pg. 6
Added Info POPULAR ELECTRONICS [2] Aug 1996 (v.13#8) pg. 6
Added Info POPULAR ELECTRONICS [2] Jan 1997 (v.14#1) pg. 59

High-performance electronic stethoscope circuit.
POPULAR ELECTRONICS [2] Jan 1999 (v.16#1) pg. 50

Build an electronic stethoscope.
POPULAR SCIENCE Feb 1970 (v.196#2) pg. 99

Recording the sounds of life. Hear the beating of an unborn heart with an electronic stethoscope. Make the device from a plastic funnel, omni-directional microphone, and a few electronic components to hear and record internal human sounds on an ordinary tape recorder. Est. cost: $20.
SCIENTIFIC AMERICAN Oct 1997 (v.277#4) pg. 138

Turning a fetal stethoscope from wood, a unique medical appliance often used by midwives.
WOODWORKER Jun 1992 (v.96#6) pg. 20

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