. Electronic apparatus for biological research . This one can This trigger is unable to initiate run-down Figure Trace brightening—It is worth noting that all the triggered triangular wave generators listed generate somewhere a positive going square wave. Where these circuits are used for cathode ray time bases this wave may usefully be applied either through a CR circuit or through an RF coupling device (see Chapter 32) to brighten the beam during its traverse, the beam being suppressed at other times. Triangular current wave generators In this section we are concerned with the producti
. Electronic apparatus for biological research . This one can This trigger is unable to initiate run-down Figure Trace brightening—It is worth noting that all the triggered triangular wave generators listed generate somewhere a positive going square wave. Where these circuits are used for cathode ray time bases this wave may usefully be applied either through a CR circuit or through an RF coupling device (see Chapter 32) to brighten the beam during its traverse, the beam being suppressed at other times. Triangular current wave generators In this section we are concerned with the production of triangular waves of current in an inductive device such as a beam-deflector coil for a cathode ray tube. Such a coil comprises inductance and resistance in series {Figure ), the resistance being of course the inevitable resistance of the wire with which the coil is wound. If it is required to produce a current which rises at a steady d//d/ = /, then the potential difference across the coil terminals required to produce it has the 'penthouse' form of Figure and comprises two components: a square wave to overcome the back , of magnitude Li, plus a triangular wave of slope tR, to overcome the drop across the resistance. There are thus two approaches to the problem of triangular current generation: to supply a current wave of the form of Figure from a constant-current generator, or to supply a voltage wave of the form of 247
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