Recently, Somebody Somewhere wrote these words
> I'm not sure I understand your question but I think the answer to your
> question is option #1. That's because the circuit needs a low source
> (power supply) impedance. I suspect your RFI is caused by parasitic
> oscillations setup by the higher Ft of your replacement transistors.
> Again, guessing, your replaced the old steel case TO3s with aluminum
> case TO3s. One simple solution is to find some steel case BUX80s. If
> they are not available you might try killing the oscillations with 100
> pF caps from collector to ground. You may need to increase Rb on the
> transistors too.
>
> Fred Townsend
>
I put in Manufacturer replacement (Aluminium) BUX 80s before testing.
My take on the thing is this: The earthing is poor, like so
(Anklebone connected to ..................... neck)
The inductive spikes are getting out through poor diodes, and the
transistors were a red herring. The machine was made to make noise, and
that's what it does.
So I was looking at constructing a mains filter to test this, and see if
that would solve it.
>Option 1:
>Mains-----Inductor----------------Bridge Rectifier
> Capacitor
>Mains-----Inductor----------------Bridge Rectifier
>
>Or some other way, e.g.
>
>Option 2:
>Mains----------------Inductor------Bridge Rectifier
> Capacitor
>Mains----------------Inductor------Bridge Rectifier
>
>
>
>
--
With best Regards,
Declan Moriarty.
--
Author: Declan Moriarty
INET: [EMAIL PROTECTED]
Fat City Hosting, San Diego, California -- http://www.fatcity.com
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