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Re: [OM] Olympus T28 Twin Macro flash

Subject: Re: [OM] Olympus T28 Twin Macro flash
From: "C.H.Ling" <ch_photo@xxxxxxxxxxxxx>
Date: Thu, 20 Aug 2009 12:01:07 +0800
305VDC for T-32 is fine.

BTW, I just checked the PBG2 schematic, the switching transformer output has 
diodes connected so it will output rectified voltage but you will not be 
able to read the peak output voltage with a normal meter even if you can 
power it up without connecting a T-32.

C.H.Ling

----- Original Message ----- 
From: "Chuck Norcutt"

> No, the SP Power Pack is a high voltage device driven by a 12 volt lead
> acid Panasonic style camcorder battery.  It connects directly to the
> T32's external input connector.  The output is 305 volts DC at 500ma.
> It's a near clone of a Quantum Turbo Battery and uses Quantum's own
> cables to connect to various flash units.
>
> I have cables for the T32, Canon 540EZ, Sunpak 422 and Sunpak 522.  I
> haven't injured a flash with it yet.  But I am careful not to fire too
> fast without letting the flash cool.
>
> Chuck Norcutt
>
>
> C.H.Ling wrote:
>> You mean you SP pack is a 6V DC device? In this case the high output
>> voltage/current of your power pack can also speed up the charging but it 
>> is
>> danger to drive the T-32 at such high current. I remember the initial
>> charging current of T-32 with AA Ni-cd is over 5Amp.
>>
>> If your SP pack is AC and directly connected to T-32's external input
>> connector then it will charge fast but you have to note the output 
>> voltage
>> must not exceed 230VAC.
>>
>> C.H.Ling
>>
>> ----- Original Message ----- 
>> From: "Chuck Norcutt"
>>
>>> However it does it the SP pack is pretty fast.  About 1-1/2 seconds to
>>> recharge a T32 after a full dump.  That's about the same time as my
>>> homemade inverter takes to recharge a single Alien Bee 800 after a full
>>> dump.  And it can do all four in 6 seconds.
>>>
>>> Chuck Norcutt
>>>
>>>
>>> C.H.Ling wrote:
>>>> I have checked the T-32 schematic, the input pins were directly 
>>>> connected
>>>> to
>>>> the 330V high voltage capactior through two diodes and two 27 ohm
>>>> resistors.
>>>> For sure the output from the  PBG2 is high voltage AC.
>>>>
>>>> One of the reason for Piers not able to measure it could be due to a 
>>>> pin
>>>> is
>>>> connected to the T-32 power switch, if you don't turn on the T-32
>>>> (obviously
>>>> since you cannot connect a T-32 during measurement) there is no output
>>>> from
>>>> the PBG2.
>>>>
>>>> Chuck, the SP Power Pack you mention could have a lower internal
>>>> resistance
>>>> so it charge faster. The PBG2's inverting circuit just like the one
>>>> built-in
>>>> T-32 or a bit powerful so it charge a little faster but not as fast as
>>>> your
>>>> SP pack. Due to the loading of the charging cap, the output of the
>>>> inverting
>>>> circuit is not able to maintain 300V* until the cap is fully charged 
>>>> up.
>>>>
>>>> * I have no idea what is the exact AC output voltage from the inverting
>>>> circuit. Most likely around 210VAC RMS since the charging cap only 
>>>> rated
>>>> at
>>>> 330V DC.
>>>>
>>>> C.H.Ling
>>>>
>>>>
>>>> ----- Original Message ----- 
>>>> From: "Chuck Norcutt"
>>>>
>>>>> That makes more sense.  If the output was 300v it would likely charge 
>>>>> a
>>>>> T32 in about 1-1/2 seconds as does my SP Systems Power Pack.
>>>>>
>>>>> Chuck Norcutt
>>>>>
>>>>>
>>>>> Piers Hemy wrote:
>>>>>> Actually that's wrong, I just measured the output from PBG2 - it's 
>>>>>> not
>>>>>> 300v,
>>>>>> it just under 6v (but the batteries are getting on a bit).  But there
>>>>>> is
>>>>>> no
>>>>>> available output socket when a falsh unit is connected.
>>>>>>
>>>>>> Piers
>>>>>>
>>>>>> -----Original Message-----
>>>>>> From: Piers Hemy [mailto:piers@xxxxxxxx]
>>>>>> Sent: 19 August 2009 16:09
>>>>>> To: 'Olympus Camera Discussion'
>>>>>> Subject: Re: [OM] Olympus T28 Twin Macro flash
>>>>>>
>>>>>> --snip
>>>>>>
>>>>>> And you can also discount using the PBG2, for (as noted by John
>>>>>> Hermanson
>>>>>> in
>>>>>> the past day or so) it outputs 300volts direct to the capacitor of 
>>>>>> the
>>>>>> attached T32 (or TPC).
>>>>>>
>>>>>> --snip
>>>>>>
>>>>> -- 
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>>>>>
>>>>>
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>>>
>>
> -- 
> _________________________________________________________________
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> Themed Olympus Photo Exhibition: http://www.tope.nl/
>
> 

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