From: Spehro Pefhany
Subject: Re: Using PC as signal generator...
References: <55WE9.firstname.lastname@example.org> <2eXE9.6190$GR5.email@example.com> <firstname.lastname@example.org>
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Date: Wed, 27 Nov 2002 23:07:37 GMT
NNTP-Posting-Date: Wed, 27 Nov 2002 18:07:37 EST
On Wed, 27 Nov 2002 15:14:27 +0000 (UTC), the renowned
>- Ren? - wrote:
>> On Wed, 27 Nov 2002 06:30:58 +0000 (UTC),
>>>> Lol.. sorry for not specifying. I mostly want to use it at around 500Hz -
>>>> 15KHz to pulse a square wave to a flyback transformer for my HV experiments.
>>>> I've built this circuit
>>>> (http://4hv.org/schematics/info.cgi?entry=universal), based on a 555 timer,
>>>> which works fairly well but I want a larger range and a bit more control.
>>>> Thank you!
>>>I've not looked at the schematic.
>>>A square wave is almost certainly not what you want.
>>>Look at the 555 datasheet, and find out how to vary the pulse-width.
>>>You may need to go to a 556, to get full flexibility.
>>>I think connecting this sort of stuff to a PC is probably a bad idea
>>>unless you fully understand the whole circuit.
>> One inverting schmidt trigger gate, 2 diodes, 2 pots, one capacitor -
>> total duty cycle and frequency control. A HEF40106 contains 6 such
>> %$#@ 555 - will they never die.....
>They can be handy.
>Not too easy to kill, high current output.
Compare frequency initial accuracy of a CMOS ST gate vs. any kind of
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