Re: [TCML] op amp wiring

[DC Cox <resonance@xxxxxxxxxxxx>]

First, don't use the 2N3055 --- it is not robust enough and will definitely
fail with time.  Ask me how I know this.

I use a much more robust transistor capable of handling 30 Amps at 60
Volts.  It is so robust it will never fail.

Send me an email tonight from your home base and I will email you the
schematic.  It was designed by me to
be so tough that it's nearly bullet proof.  I over engineered everything.

DC




On Thu, Jan 15, 2009 at 10:22 AM, Scott Bogard <sdbogard@xxxxxxxxx> wrote:

> I'll put a schematic up someplace later it may be some time as I don't
> have internet in my apartment and school internet frowns on uploading
> files; but basically this will be a modification of the single
> transistor feedback winding schematic, the op amp will have a steady 6
> volt fed the the non-inverting pin? and the sinusoidal output (which
> would normally be the base for the 3055 transistor) will go to the
> inverting pin?.  The idea is to have the op amp flip between 0 and 12
> volts to drive a mosfet for a square wave output, when the mosfet is
> on, it will choke the input to the inverting pin (via the feedback
> winding) until the op amp switches off, and then the cycle begins
> again when the field in the feedback winding dissipates.  This is
> probably an over complicated system, but I want something that is
> square wave and self resonant (the standard 3055 circuit seems to
> never utilize the full 12 volts input unless I'm reading the
> oscilloscope wrong, and I don't like the 555 timer circuits as they do
> not dynamically adjust to load.)  Also as best I can tell nobody does
> it this way and I wanted to make something original; then again maybe
> they done do this because it won't work, I don't know.  Any help would
> be appreciated.
>
> Scott Bogard.
>
> On 1/15/09, Gabriel Cardona <cardogab7341@xxxxxxxxx> wrote:
> > Scott,
> >
> > Can you explain what you're trying to do?
> >
> > 1. What will the output of the op-amp be connected to and what voltage
> > levels are needed at the op-amp output?
> > 2. What voltage levels will be at the input to the op-amp?
> > 3. What is the op-amp you're using (manufacturer and part number)?
> >
> > With this information, it will be easier to help.
> >
> > Regards,
> >
> > Gabe Cardona
> >
> >
> > ________________________________
> >
> >
> >
> >
> > ________________________________
> > From: Scott Bogard <sdbogard@xxxxxxxxx>
> > To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> > Sent: Wednesday, January 14, 2009 1:17:51 PM
> > Subject: [TCML] op amp wiring
> >
> > Hey guys,
> >      I am in need of some assistance, I am doing an experiment with
> > flyback drivers, and the circuit I designed uses a Op-amp in a
> > comparator configuration.  The only problem is I know nothing about
> > actually wiring an Op-amp except for the extreme basics (inverting
> > pin, non-inverting pin, output) which I learned in school.  I do not
> > know how to connect it to the power supply, if I need negative
> > voltage, what the "offset" pins are for, what Vcc or Vss is, etc.  Any
> > help would be appreciated, there are 8 pins and I only know for sure
> > what 3 of them do, thanks.
> >
> > Scott Bogard
> > _______________________________________________
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> >
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