File:The Armstrong super-regenerative circuit (1922) (14574210478).jpg

Identifier: armstrongsuperre01eltz (find matches)
Title: The Armstrong super-regenerative circuit
Year: 1922 (1920s)
Authors: Eltz, George Jacob, b. 1893
Subjects: Radio
Publisher: New York, N.Y. : Radio Directory and Pub. Co.
Contributing Library: Northeastern University, Snell Library
Digitizing Sponsor: Northeastern University, Snell Library

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tery potentiometer to permit fine regula-tion of the value of the grid potentials. If desired this maybe eliminated and the regulation effected entirely by thebattery No. 7. 9-10-11. Filament rheostats of any type.12-13-14. Hard vacuum tubes such as Western Electric orUV-201. 15. This is a 1250 turn Duo-Lateral coil mounted, as shown inthe photograph, within the tube. See Fig. 9. 16. This is a 1500 turn Duo-Lateral coil also mounted withinthe tube with rather close coupling to coil No. 15. The coilsshould be so placed that the outside of the winding connectsto the plate and grid when they are arranged for oscillation. 17. This is a .003 M. F. fixed mica condenser and with coil No.16 gives a frequency of the order of 7000 to 8000 cycles.This frequency is sufficiently high to be readily filtered outand at the same time low enough to give good amplificationresults. 18. This is a separate C battery for regulation of the negativepotential of the oscillator tube. It is not necessary in some
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O) a «4HO a;73 O o _ CO (D .S •i -a d o o bfi o fl 3 03 s u -l-> (D a o O) J rt The Armstrong Super-Regenerative Circuit 23 cases though frequently with certain tubes, both negativeC batteries must be varied to obtain results. One ortwo small flashlight cells are suitable.19-20-21-22-23. These units comprise the filter system; they areconsidered separately in a chapter on filters. 24. Primary of audio-frequency transformer. 25. Secondary of audio-frequency transformer. 26. Negative C battery for use with audio-frequency trans-former when the plate voltage is above 100 volts. Thisbattery should have a voltage of 3-41/2 volts. 27. Filament control jack first stage type. 28. Filament control jack last stage type. Both these jacks maybe dispensed with if it is desired to do so. 29. Six volt storage battery. 30. 45-88 volt B battery. 31. 45-88 volt B battery depending on the tubes used and thevalue of battery No. 30. In other words both batteries No.30 and No. 31 must be varied to gi

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