Reply to thread

Message

<blockquote data-quote="Mike D90" data-source="post: 261221" data-attributes="member: 17556">Vivitar 283's and 285's had a factory variable power module, Vari Power, for these flash units.&nbsp; Cheap, at one time, and only marginally effective at controlling the flash power.I found a site, actually two sites, that detailed the making of a better variable power module using linear taper pots.I finished mine today. I built two but I accidentally trashed one of the pots with a drill bit.&nbsp; So I show the one that works.Mine is a bit different than either of the two I saw online.I used three 100K ohm pots, wired in series, that give a total of almost 300K ohms resistance which allows full power selection and can be dialed down to a very low power. I cannot effectively measure the output at lowest power.&nbsp; Well, I can using a meter I guess, but I have no meter to measure the stop increments.&nbsp; I just can tell by the light emitted that it will be well under what I would ever need to dial the flash down too.[ATTACH=full]71383[/ATTACH]</blockquote>

[QUOTE="Mike D90, post: 261221, member: 17556"] Vivitar 283's and 285's had a factory variable power module, Vari Power, for these flash units. Cheap, at one time, and only marginally effective at controlling the flash power. I found a site, actually two sites, that detailed the making of a better variable power module using linear taper pots. I finished mine today. I built two but I accidentally trashed one of the pots with a drill bit. So I show the one that works. Mine is a bit different than either of the two I saw online. I used three 100K ohm pots, wired in series, that give a total of almost 300K ohms resistance which allows full power selection and can be dialed down to a very low power. I cannot effectively measure the output at lowest power. Well, I can using a meter I guess, but I have no meter to measure the stop increments. I just can tell by the light emitted that it will be well under what I would ever need to dial the flash down too. [CENTER][ATTACH type="full" width="60%"]71383._xfImport[/ATTACH][/CENTER] [/QUOTE]

Verification