EP-1 / EP-2 need info

ratboy · 3rd February 2006

Hi Guys & Girls

Does any one here uses the EP-1 or EP-2 external power pack for Minolta flashes ?

I need some info

is it only 2 pins that is active ?
whe does the flash have a 3rd pin ... ?

can you put a multimeter to the pins
and tell me approx voltage and polarity ?

Just wondering if there is some deep circuitry or
is it just an expensive battery box and cable.

Thanks

Del_CtrlnoAlt · 3rd February 2006

hmm... cheem... my electrical knowledge beri bad... wats a multimeter?

ratboy · 3rd February 2006

Originally Posted by Del_CtrlnoAlt

hmm... cheem... my electrical knowledge beri bad... wats a multimeter?

Multimeter ... something to connect to a photocell and use as advance light meter

Timber Wolf · 4th February 2006

Hello, I've talked to a KM tech, and he says that the three pins are +ve, -ve and ground, something like the system we have in our home AC sockets. Apparently, (though I'm not sure how it works), the charging voltage is the same but the voltage from the extra two batteries is converted to extra charging current, hence the shorter charging time.

I'm not really sure about the 2nd point though, any one with knowledge on capacitance and stuff can care to help?

Cheers
QX

ratboy · 4th February 2006

Hmmm

I have good cause to suspect,
there is a mini inverter in the EP-1/2
that will convert the current to AC,
then step up current to 330volts,
then rectify to DC again

Most prob it's more worth it to buy the EP-2 then to try to build
and blow up the 5600HS....

So much for reverse engineering ..
unless some one volunteers to open up one : )

Timber Wolf · 5th February 2006

Hmm. Can you explain the step-up part?
Cheers,
QX

I thought it might be:

9VDC => AC current => Step down =>Rectify to 6VDC with capacitor regulation.

Just speculation =)
QX

ratboy · 5th February 2006

got respond from the Minolta Yahoo Group

> The label on my EP-1 states:
>
>INPUT 9V 8.5W
>OUTPUT 330V 2.5W
>
>The label on an EP-2 states:
>
>INPUT Use type AA batteries
>OUTPUT 330V 2.5W
>

here's the link to pict posted

http://www.hjreggel.net/digiphoto/D7Hi/EP-2_Back.jpg

the high voltage/low amp
allows the caps to charge must faster than low voltage/high amp

at least thats what i understand...

AncientMariner · 5th February 2006

Sorry, OT slightly.
How much does it cost to buy a EP-2 now?

ratboy · 5th February 2006

better still
anyone selling used ones ? : )

3rd February 2006	#1
ratboy Member Join Date: Sep 2002 Posts: 702	EP-1 / EP-2 need info Hi Guys & Girls Does any one here uses the EP-1 or EP-2 external power pack for Minolta flashes ? I need some info is it only 2 pins that is active ? whe does the flash have a 3rd pin ... ? can you put a multimeter to the pins and tell me approx voltage and polarity ? Just wondering if there is some deep circuitry or is it just an expensive battery box and cable. Thanks

3rd February 2006	#2
Del_CtrlnoAlt Senior Member Join Date: Feb 2003 Location: Outside the Dry Box. Posts: 16,342	Re: EP-1 / EP-2 need info hmm... cheem... my electrical knowledge beri bad... wats a multimeter? __________________ Logging Off Permanently. Those who need to contact me will know where to contact me.

4th February 2006	#4
Timber Wolf Member Join Date: Oct 2003 Posts: 910	Re: EP-1 / EP-2 need info Hello, I've talked to a KM tech, and he says that the three pins are +ve, -ve and ground, something like the system we have in our home AC sockets. Apparently, (though I'm not sure how it works), the charging voltage is the same but the voltage from the extra two batteries is converted to extra charging current, hence the shorter charging time. I'm not really sure about the 2nd point though, any one with knowledge on capacitance and stuff can care to help? Cheers QX

4th February 2006	#5
ratboy Member Join Date: Sep 2002 Posts: 702	Re: EP-1 / EP-2 need info Hmmm I have good cause to suspect, there is a mini inverter in the EP-1/2 that will convert the current to AC, then step up current to 330volts, then rectify to DC again Most prob it's more worth it to buy the EP-2 then to try to build and blow up the 5600HS.... So much for reverse engineering .. unless some one volunteers to open up one : )

5th February 2006	#6
Timber Wolf Member Join Date: Oct 2003 Posts: 910	Re: EP-1 / EP-2 need info Hmm. Can you explain the step-up part? Cheers, QX I thought it might be: 9VDC => AC current => Step down =>Rectify to 6VDC with capacitor regulation. Just speculation =) QX

5th February 2006	#7
ratboy Member Join Date: Sep 2002 Posts: 702	Re: EP-1 / EP-2 need info got respond from the Minolta Yahoo Group > The label on my EP-1 states: > >INPUT 9V 8.5W >OUTPUT 330V 2.5W > >The label on an EP-2 states: > >INPUT Use type AA batteries >OUTPUT 330V 2.5W > here's the link to pict posted http://www.hjreggel.net/digiphoto/D7Hi/EP-2_Back.jpg the high voltage/low amp allows the caps to charge must faster than low voltage/high amp at least thats what i understand...

5th February 2006	#8
AncientMariner Account Suspended Join Date: Dec 2004 Location: Little Red Dot Posts: 1,067	Re: EP-1 / EP-2 need info Sorry, OT slightly. How much does it cost to buy a EP-2 now?

5th February 2006	#9
ratboy Member Join Date: Sep 2002 Posts: 702	Re: EP-1 / EP-2 need info better still anyone selling used ones ? : )