. Electronic apparatus for biological research . Figure Figure used to form a triode Hartley oscillator. R^ and Q supply a direct decoupled screen potential. The suppressor is earthed in the usual manner, and the load is connected between anode and HT. Thus the oscillating triode section is screened from the anode and the effects of diverse anode loads by the suppres- sor. A small proportion of the electron stream passes to the screen and serves to sustain oscillation, the rest passes through to the anode to develop power in the load. The anode current is far from sinusoidal and a
. Electronic apparatus for biological research . Figure Figure used to form a triode Hartley oscillator. R^ and Q supply a direct decoupled screen potential. The suppressor is earthed in the usual manner, and the load is connected between anode and HT. Thus the oscillating triode section is screened from the anode and the effects of diverse anode loads by the suppres- sor. A small proportion of the electron stream passes to the screen and serves to sustain oscillation, the rest passes through to the anode to develop power in the load. The anode current is far from sinusoidal and a further tuned circuit usually constitutes the load in order to recover a pure waveform. The pentode electron coupled oscillator frequency is thus independent of the load, but unfortunately it is not independent of variations in the HT supply. In the simplified description of LC oscillator operation, the tuned circuit was merely said to be 'resonant' but nothing was said about precisely how the resonant frequency is found. It is certainly not far from m = {XjLCy^^ and for practical purposes this is sufficient, since LC will be made adjustable and will be set up to give the frequency required. However, it is important to * Also the frequency, sUghtly. 15 213
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