[Milsurplus] Dynaverters

[J. Forster]

I assume the Dynavereters are a typical mid to late 50s design, likely using
2N174s or something similar operating at a few KHz as a square wave inverter. I
don't know if they are potted, hence the question about singing. Weight is
always an issue with airborne gear.

That kind of inverter also produces current hash on the input line due to
switching transients, hence the other question.

Thanks,
-John


Bob Camp wrote:

> Hi
>
> I doubt they are much different than the solid state supplies built for
> other tube based gear. There are only so many ways to do a job like
> that.
>
> A reasonable "commercial" equivalent would be the transistor based
> power supplies that ran the Motorola or GE two way radios. They handled
> similar power and voltage levels. The only difference would be the 12
> volt versus 28 volt input supply.
>
> Unless you fully pot one of these gizmos it's going to "sing". You are
> moving a pretty good amount of current at the input and switching at a
> nice audio frequency. The transformer leads and even the leads on the
> emitter resistors moved enough to be audible.
>
> Depending on the era you will either have nice fat germanium power
> transistors or later on silicon parts. The transformer feedback
> oscillator was pretty similar in both cases, but replacing the
> germanium's with silicon parts generally resulted in disaster.
>
> None of that actually answers your question ....
>
>         Take Care!
>
>                 Bob Camp
>                 KB8TQ
>