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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Tune your receiver by the numbers. Add a 4-digit display which indicates AM frequencies to the nearest 1kHz and FM frequencies to the nearest 100 kHz.
POPULAR ELECTRONICS [1] Oct 1981 (v.19#10) pg. 33

Circuit of an FET DC voltmeter for use as a "signal-strength meter" for an AM radio.
RADIO-ELECTRONICS Dec 1987 (v.58#12) pg. 15

An auxiliary amplifier and large speaker to amplify the sounds coming from a pocket-size transistor radio. Connection to larger speaker is via earphone jack in pocket radio.
RADIO-TV EXPERIMENTER Aug-Sep 1968 (v.25#1) pg. 67

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