[ARC5] Vibrator power supply

[J. Forster]

The resistor test is easy to set up with a couple of resistors, a power
supply and some clipleads.

-John

===========


> On 12 Dec 2012 at 9:37, J. Forster wrote:
>
>> Hi,
>>
>> It's really hard to judge much about the vibrator condition when
>> operating in-circuit because of the responses of the inductors and
>> capacitors.
>
> Correct. Even so, it sure looks like the vibrator contacts are
> deteriorated to
> me. I am basing this on both what I have seen in my own experience, and
> what I have seen in the ARRL handbooks on vibrators.
>
>> Consider operating the vibrator with just a pair of resistive loads
>> with the design voltage and current applied. That will immediately
>> tell you the contact condition, bounce, etc.
>
> Yes. This would certainly preclude having to take the derned thing apart.
> My
> success rate for doing this was about 50%, at best...
>
> I really wouldn't do it if I could avoid it.
>
> I have always felt that vibrators were a big PITA, in any case, and that
> transistors and/or power-FETs were a great blessing for this purpose.
>
> Ken W7EKB
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