[Milsurplus] PE-104-A Power Unit Vibrator Help

[Bruce Gentry]

The modules are powered entirely by the power on the primary of the 
transformer. Therefore, the voltage needed to operate the microprocessor 
the drives the MOSFETS is regulated down from the battery voltage on the 
transformer, not the 6 volts that normally operates the vibrator. 
Apparently, the designer didn't feel it was practical to derive the 
microprocessor voltage from such a wide range.

      Bruce Gentry, KA2IVY

On 2/25/18 7:20 PM, Robert Downs wrote:
>
> OK. But it still doesn’t make sense that you have to have one of each 
> in order to operate from all three primary voltages. The DY-88, like 
> most of the rest of the Korean War (and some of the late WW-II) 
> supplies is designed to use either of two vibrators, one series fed 
> and the other shunt fed. The switch over between the two is handled by 
> the socket wiring.  But both have 6V coils.  A similar situation 
> exists in all of the dual or triple primary supply units dating all of 
> the way back to the PE-104.  Resistors are switched in to cater to the 
> two or three primary supplies in use.  The solid state designers 
> should have just used those.
>
> Robert Downs - Houston
>
> WA5CAB
>
> *From:*milsurplus-bounces at mailman.qth.net 
> [mailto:milsurplus-bounces at mailman.qth.net] *On Behalf Of *Bruce Gentry
> *Sent:* Saturday, February 24, 2018 22:31 PM
> *To:* Milsurplus
> *Subject:* Re: [Milsurplus] PE-104-A Power Unit Vibrator Help
>
> Dislexia strikes!  The low voltage version is for 3-18 volts not 3-13, 
> the high voltage version is for 12-38 volts not 13-28.   The low 
> voltage one is fine for 6 or 12 volts, the high voltage for 12 or 24 
> volts.  If the ability to operate the DY-88 on 6-12-24 volts is 
> desired, it would still require  both versions of the board.
>
>     Bruce Gentry, KA2IVY
>

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