Re: SSTC Singing Arc Design - Help needed

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "robert heidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-desertgate-dot-com>

Dan:Hi-Fi is not a consideration, but here are two considerations. 1. use a
bridge with a SCR across the DC terminals as a AC switch in series with your
NST. This can be modulated with a opto isolator to the SCR gate. 2. use a
modulated trigger gate to fire your SG with audio pulse rate.

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Wed, 11 Sep 2002 15:17:00 -0600
> To: tesla-at-pupman-dot-com
> Subject: Re: SSTC Singing Arc Design - Help needed
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Wed, 11 Sep 2002 17:51:56 -0600
> 
> Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <m.j.watts-at-massey.ac.nz>
> 
> Hi Dan,
> 
> On 11 Sep 2002, at 12:49, Tesla list wrote:
> 
>> Original poster: "Mccauley, Daniel H by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>
>> 
>> 
>> 
>> Well, I'm off to begin my SSTC Singing Arc project.  I checked out Richie
>> Burnett's site and Alan Sharpe's site but didn't really find anything useful
>> as far as an actual implementation of the circuit.  So I think i'm on my
>> own.
>> 
>> The first thing I need to do is get a DC input to my power supply circuit.
>> For this, I'll just use a full-bridge rectified mains (115VAC) with some big
>> caps for smoothing filters.
>> 
>> The next thing is I need to figure out how to implement am modulation (via
>> audio signal) to my FET drive circuit.  Right now
>> I'm using a TL494 PWM Driver IC.  Someone how I need to am modulate the
>> output of this guy.  Anyone have any ideas???
> 
> Usually one feeds a regulated DC voltage into one of the opamp inputs
> to give a reference standard. You might try to feed an audio signal
> into this input so that it varies about its DC mean (which should be
> arranged to set the duty cycle to 45%).
> 
> ?
> Regards,
> Malcolm
> 
> 
>