Agilent 1949-11 free download

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HEWLETT-PACKARD JOURNAL T E C H N I C A L I N F O R M A T I O N F R O M T H E - l i p - L A B O R A T O R I E S VOL. 1 No. 3 SHED ALTO, NOVEMBER, HEWLETT-PACKARD COMPANY, 395 PAGE MILL ROAD, PALO ALTO, CALIFORNIA NOVEMBER, 1949 Design Notes on the Resistance- Capacity Oscillator Circuit Parti VER a period of years the Hewlett- siderations involved in the design of the ackard Company has been re resistance-capacity circuit. quested to design and manufacture a Briefly, the resistance-capacity oscil large number of special-purpose resis lator circuit consists of a two-stage am tance-capacity oscillators having such plifier having both negative and positive characteristics as compressed or expand ?feedback loops (Figure 2). The positive ed scales, unusually wide frequency loop causes the circuit to oscillate and in range, high power output, high and low cludes the resistance-capacity frequency- frequencies, special controls, etc. The selective network which gives the circuit following will describe some of the con- its name. *1pHE "resonant" frequency of the RC network is given by the well- known expression f0=l/27rRC. The negative feedback loop stabilizes the operation of the circuit by minimiz ing phase shift and confining oper ation to the linear portion of the characteristics of the tubes. One ele