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The high-voltage supply was therefore reduced to the point where the circuit did not free run, and a 10 kHz squarewave trigger waveform applied. The pulses were now initiated by the positive edges of the squarewave, differentiated by the 68 pF capacitor and the base resistor, at a prf of 10 kp/s. On firing, the collector voltage drops to near zero, causing a negative-going pulse to appear across the load resistor, which consisted of a 47 Ω resistor in parallel with a 50 Ω Cookbook CH01 8/3/99 12:02 pm Page 21 Advanced circuit techniques, components and concepts 21 load.

25. First, the filter action was disabled by removing the 318 Ω resistor, leaving a straight-through signal path. 25 Actual frequency response of the resistors. 24. The horizontal scale is shows the response of the log frequency, the left-hand vertical being 20 complete filter (318 Ω Hz, the 3rd, 6th and 9th vertical graticule lines resistor replaced). The representing 200 Hz, 2 kHz and 20 kHz reference level has been respectively. Horizontal graticule lines are at moved down one graticule 10 dB intervals.

24) are a little impractical. This is easily fixed by a further stage of scaling. 9 µF capacitors to a nice round value – say 10 nF. 24 (a) Complete FDNR filter with 10 kHz cut-off frequency. The (values) are a little impractical, but are easily scaled to more sensible [values]. (b) Computed frequency response of the above filter. 21(c) divided by N. Conveniently, the Cs in the FDNR are the same value as the terminating capacitors, if (as recommended) any change in the required normalised FDNR negative resistance was effected by changing the R values only.

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