The presented circuit generates a signal in the form of a ladder that can be useful for surveying the family of component curves with the oscilloscope. Its base is a transconductance operational amplifier type LM3900 or LM2900 from National Semiconductor, which needs to be supplied with a symmetrical source of 6 to 12 V. The circuit has a reset signal given by an input and the components of the non-inverting input must be determined according to their frequency of operation. The suggested components are for a 1 kHz signal.
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