A square-wave oscillator circuit containing only simple resistor-capacitor combinations and transistors operates with high efficiency at relatively high power levels

Hall, J. E., Jr.

English

NASA Technical Reports Server

NASA TECH BRIEF 
Input +V 
2N10. 
2N17(
2N 1042 
2N1702 
June 1964	 Brief 63-10554 
This NASA Tech Brief is issued by the Technology Utilization Division to acquaint industry 
with the technical content of an innovation derived from the NASA space program. 
Highly Efficient Square-Wave Oscillator Operates at High Power Levels 
The problem: To develop a compact square-wave 
oscillator that will operate with high efficiency at 
relatively high power levels. 
The solution: A circuit •containing only simple 
resistor-capacitor combinations and solid-state devices 
How it's done: The circuit is a symmetrical bridge 
with a transistor in each arm. The base of each 
transistor is connected to a parallel resistor-capacitor 
combination. Each combination is connected to the 
collector of the diagonally opposite transistor. The 
selection of transistors is the most important design 
consideration. A smooth, balanced operation is pro-
vided by using a matched pair of PNP transistors, 
Q 1 and Q 2, and a matched pair of NPN transistors, 
Q3 and Q4. In addition, these pairs should be 
complementary.
This oscillator circuit is simple and compact and 
operates with high efficiency at relatively high power 
levels. Since the circuit employs only simple resistor-
capacitor combinations and solid-state devices, its 
performance and reliability should be excellent. 
Note: 
For further information about this innovation 
inquiries may be directed to: 
Technology Utilization Officer 
Goddard Space Flight Center 
Greenbelt, Maryland 20771 
Reference: B63-10554 
Patent status: NASA encourages commercial use 
of this innovation. No patent action is contemplated. 
Source: Duke University under contract to 
Goddard Space Flight Center (GSFC- 112) 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States Govern. 
ment, nor NASA, nor any person acting on behalf of NASA: A. Makes 
any warranty or representation, express or implied, with respect to the 
accuracy, completeness, or usefulness of the information contained in
this document, or that the use of any information, apparatus, method, 
or process disclosed in this document may not infringe privately-owned 
rights: or B. Assumes any liabilities with respect to the use of, or for 
damages resulting from the use of, any information, apparatus, method, 
or process disclosed in this document.
https://ntrs.nasa.gov/search.jsp?R=19630000104 2020-03-11T16:48:31+00:00Z


High efficient square-wave oscillator operator at high power levels

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