[ARC5] [External Sender] solid state vibrator basics

[Bill Henderson]

I've never built one - never had the need.

But I would be interested in hearing from anyone who tries it.

 - Bill H. / va3hwa



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02/09/21,
01:15:26 PM

On Tue, Feb 9, 2021 at 12:39 PM J Mcvey <ac2eu at yahoo.com> wrote:

> I stared at that circuit a while trying to figure it out. I think the
> trick is that the transformer core is driven into saturation and when the
> field collapses, the reverse  pulse will turn the transistor off . The
> oscillation is basically set by the L-R time constant.
>
> However , it may be prone to latch-up, ( it is probably better if the two
> resistors are NOT equal) and it  drives the transformer pretty hard
> producing heat losses.
> The bipolar transistors also have a saturation voltage which robs a little
> amplitude from the transformer while also generating more heat.
>
> Gotta give it kudos for simplicity, though!
>
> Jim
>
> On Tuesday, February 9, 2021, 10:17:29 AM EST, Bill Henderson <
> bill.henderson at ocdsb.ca> wrote:
>
>
> Please see attached for another approach
>
>  - Bill H. / va3hwa
>
>
>
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> <https://mailtrack.io?utm_source=gmail&utm_medium=signature&utm_campaign=signaturevirality5&> 02/09/21,
> 10:15:28 AM
>
> On Mon, Feb 8, 2021 at 7:29 PM J Mcvey via ARC5 <arc5 at mailman.qth.net>
> wrote:
>
> This not specific for your vibrator, but the concept works for any of
> them, you just have to wire to the correct pins for your particular type.
>
> The synchronous contacts ( if any) are replaced by rectifier diodes ( in
> the correct polarity , of coarse).
>
> The oscillating frequency is approx 110 Hz
>
> I used BUZ11 mosfets with good results.
>
> The zeners can all be adjusted to 12V , since the mos gates are good to
> 20V and the 4047 is 18v max.
>
>
>
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