`ATT ir]
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`
`ELECTRONIC
`PROJECTS
`
`Herbert Friedman
`
`
`
` cn
`
`Exhibit 1038 - Page 1 of 4
`
`Samsung et al. v. Resonant Sys.
`IPR2023-00993 - Exhibit 1038
`
`Exhibit 1038 - Page 1 of 4
`
`
`
`99
`ELECTRONIC
`PROJECTS
`
`by
`wed
`Herbert Friedman
`
`|
`
`—
`
`|
`
`|
`
`LAFAYETTE RADIO ELECTRONICS
`111 JERICHO TURNPIKE, SYOSSET,N.Y. 11791
`
`Exhibit 1038 - Page 2 of 4
`
`Exhibit 1038 - Page 2 of 4
`
`
`
`FIRST EDITION
`
`FIRST PRINTING—1976
`
`Copyright © 1971 and 1976 by Howard W..Sams & Co., Inc., Indi-
`anapolis, Indiana 46268. Printed in the United States of America.
`
`All rights reserved. Reproduction or use, without express permis-
`sion, of editorial or pictorial content, in any manner, is prohib-
`ited. No patent Hability is assumed with respect to the use of the
`information contained herein. While every precaution has been
`taken in the preparation of this book, the publisher assumes no
`responsibility for errors or omissions. Neither is any liability
`assumed for damages resulting from the use of the information
`contained herein. ..
`'
`Me
`
`International Standard Book Number: 0-672-22814-9
`
`Exhibit 1038 - Page 3 of 4
`
`Exhibit 1038 - Page 3 of 4
`
`
`
`SG.rrcaision FREQUENCY OSCILLATOR
`
`If you need a precision, frequency-controlled signal source for
`remote triggering of a telephone “snooper”or other selective
`device, you might try an electromechanical resonator.
`.
`~
`The frequency of resonator F1 in the transmitter unit should
`match the frequency of the reed relays in the receiving unit.
`A switch will allow several different resonator frequencies to
`-be installed in the transmitter.
`
`PARTS LIST
`
`Capacitor, 0.2-puF, 10-Vde (Lafayette 34-82734)
`Twintron resonator (H. B. Engineering Corp., 1101 Ripley St., Silver
`Spring, Md. 20910)
`Darlington amplifier, GE DI6P1 or equiv.
`Resistor, 4.7-megohms, V/2-watt (Lafayette 52-31618)
`Resistor, 2000-ohm, 1/2-watt (Lafayette 52-3081 8)
`
`a ¢
`
`Resistor, 560-ohm, V2-watt (Lafayette 52-30677)
`very few components. OUTPUT
`
`Fig. 99. This precision oscillator uses
`
`A small amplifier with a speaker connects to the output of a
`darlington amplifier (Q1). In operation, the resonator passes
`only the tuned frequencyas positive feedback, causing the am-
`plifier to oscillate at the resonant frequency.
`
`‘126
`
`Exhibit 1038 - Page 4 of 4
`
`Exhibit 1038 - Page 4 of 4
`
`
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