Re: Oscillator circuit for solid-state TC

• To: tesla-at-pupman-dot-com
• Subject: Re: Oscillator circuit for solid-state TC
• From: Julian Green <julian-at-kbss.bt.co.uk>
• Date: Tue, 8 Oct 96 10:20:57 BST

>For those who have built (or are building) a solid-state TC circuit, I was
>hoping you might tell me how you built your oscillator to drive the
>circuit. I ask because I've seen some simple oscillators built around the
>555 IC, but I wasn't sure just how versatile they were in general, and what
>kind of bandwidth you might get out of the 555 if it were a variable
>frequency oscillator. In contrast to the 555, Duane Bylund in his book has
>a circuit built around the "SG3524" IC which has a maximum operating
>frequency of 150 khz. Anyone else used this chip and built an oscillator
>with it?

>Thanks,
>Jeff Detweiler

Ive seen 555 chips go at 350KHz it used a 150pF mica capacitor.  Duty cycle
can be changed by altering the ratio between charge up (resistor connected 
to +V) and discharge resistor (connected to pin 7)

Julian Green

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