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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
Click on a see also (sa) or tracing (xx) to view detailed entries about a related subject.
The entries are in alphabetical order by magazine name and then in chronological sequence.
To obtain a copy of any magazine article contact your local public library or the publisher.


An audio Q-multiplier for SWLs and hams.
ELECTRONICS ILLUSTRATED Jul 1969 (v.12#4) pg. 97

Circuit for a Q-multiplier for high IF's. Covers IF's up to 1430 KHz.
POPULAR ELECTRONICS [1] Jul 1968 (v.29#1) pg. 66

Circuit for an audio Q-multiplier to increase the selectivity of a receiver.
POPULAR ELECTRONICS [1] Aug 1968 (v.29#2) pg. 77

Improve receiver sensitivity and selectivity with a Q-multiplier/amplifier. Uses a field-effect transistor stage. Est. cost: $10.
POPULAR ELECTRONICS [1] Dec 1968 (v.29#6) pg. 51

Q-multiplier boosts SW selectivity and gain. Est. cost: $20.
POPULAR ELECTRONICS [1] Apr 1974 (v.5#4) pg. 32

Schematic for a Q-multiplier (audio filter) to improve the selectivity of the CW and SSB in the Realistic DX-300 receiver. Other tips on improving this receiver are mentioned.
POPULAR ELECTRONICS [1] Sep 1980 (v.18#3) pg. 110

Audio Q-multiplier, an audio filter for Morse-code reception.
POPULAR ELECTRONICS [2] May 1989 (v.6#5) pg. 48

Audio Q-multiplier circuit which provides enhanced receiver selectivity and gain centered around a 1.5-kHz audio output frequency. This filter connects between receiver and the headphones or speaker.
POPULAR ELECTRONICS [2] Feb 1999 (v.16#2) pg. 55
Correction POPULAR ELECTRONICS [2] May 1999 (v.16#5) pg. 64