[sdiy] TZ triangle core

[Ian Fritz]

Sorry, I can't understand this at all.  You seem to be giving a lot of 
peripheral information without saying what the circuit is.

Ian


At 03:19 PM 3/2/2011, David G. Dixon wrote:
> > I don't get it. Where does the modulation go, ie where is the
> > multiplier?
>
>In the loop.  The Linear FM circuit is a balanced modulator (four-quadrant
>multiplier) made up of two linearized 2164s.  The (optionally inverted)
>triangle is driving two comparators with opposite inputs (each limited with
>separate zener circuits), and each zener-limited comparator output is
>dropped across a resistor and fed into one side of the modulator.  By using
>two comparators (LM319), I didn't have to invert anything by converting
>currents to voltages, which is slow.  Only currents are going around the
>loop at virtual ground.  Also, with the balanced modulator, I easily get
>voltage-controlled time reversal (a la the "Zeroscillator").  Also, because
>one input of each comparator is grounded, I obtain variable sync simply by
>spiking it.