The prototype had a peak-power of 1 kW, and used a pulse length of 2 to 3 ?s with a 10-to 20 kHz PRF . The receiver was a super-heterodyne type using Acorn tubes and a 6 MHz IF stage.
32.
In vivo studies on the long-term effects of ultrasound on the skin's barrier properties, the underlying muscle tissue and the body's immune system, as well as tests to determine the optimum pulse length, frequency and intensity of ultrasound, have yet to be done.
33.
One possibility for reducing this error is to halve the feedback pulse length to half a clock period and double its amplitude by halving the impulse defining resistor thus producing an impulse of the same strength but one which never butts onto its adjacent impulses.
34.
R2 line signalling variants that support R2 line signalling in its electrical-pulse form by dedicated two-wire or four-wire circuits usually represent each signal as two different pulse lengths ( e . g ., 150 milliseconds versus 600 milliseconds ), where the two different meanings of those two different pulse lengths varies by context.
35.
R2 line signalling variants that support R2 line signalling in its electrical-pulse form by dedicated two-wire or four-wire circuits usually represent each signal as two different pulse lengths ( e . g ., 150 milliseconds versus 600 milliseconds ), where the two different meanings of those two different pulse lengths varies by context.
36.
A quick finger on the switch might be able to do it ( or even just the capacitor's discharge time, if resistance isn't too strong ), but you can also build a circuit that produces a certain pulse length with a 555 timer IC ( rated for a suitable voltage ) .-Rainwarrior 20 : 24, 2 October 2006 ( UTC)
