ASM-1 VCO

Dr Steve Grainger s.grainger at staffs.ac.uk
Mon Nov 1 12:18:05 CET 1999


Dear All,

	In amoment of madness had a go at the ASM-1 VCO at the weekend.

	It works fine except for the amplitude of the sawtooth which instead
	of being 0 to +5V is up at +2.5V to +5V (peak to peak) ie. it has
	a large DC offset.

	I suspect this might be caused by the ON resistance of the JFET
	(Rds (ON)) for which I am using a 2N3819, causing the integrator
	capacitor to not discharge completely.

	Any comments on this problem - given that this is the UK and 
	JFETs seem as rare as hen's teeth !

	Regards

	Steve Grainger



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