SINE WAVE OSCILLATORS 



tends to increase, increasing the negative feedback. The outputs are in 

 push-pull and the magnitude determined by the variable resistor. It is quite 

 easy to get 50 V peak to peak with good waveform from each anode, with 

 this circuit. 



A complete oscillator, using the Wien bridge principle, and very suitable 

 for checking electrophysiological apparatus, has been published by Scroggie^, 



HT+ 



Figure 14.34 



Figure 14.35 



see also Sinfield^. A very ingenious form of phase shift oscillator of novel 

 design has been described by Raistrick^". It is claimed that no regulating 

 device is required, and only one resistance has to be altered to adjust the 

 frequency ; three valves are, however, necessary. A similar device which can 



HT+ 



be used as an oscillator or as a tuned amplifier has been published by 

 Morton^^. 



REFERENCES 



1 Attree V. H. /. Sci. Inst rum. 26 (1949) 257 



^ Carter J. M. Designing a tape recorder Wireless World 59 (1953) 164 



^ Donaldson P. E. K. A multiple-channel oscilloscope for electrophysiology 



Electron. Enging. 39 (1957) 78 

 4 MACLEOD K. C. /. Television Soc. 5 (1949) 201 



224 



