 Ouch!!!!!!!!!, How do I discharge the flash cap? |
  |
  Jan 23 2004, 08:56 AM
Post
#1
|
|
 Advanced Member  Posts: 122 Joined: 3-September 03 From: Holt, Michigan Member No.: 151  |
I was modifying my first 380 last night and got zapped by the cap. I also tore the ribbon cable for the display so I have to send it in for repair. How do I keep from doing this again?
Thanks 
 |
  
|
|
| Guest_elkaholic_* |
Jan 23 2004, 08:58 AM
Post
#2
|
 |
Just be careful...........
 
|
|
|
|
|
Jan 23 2004, 09:21 AM
Post
#3
|
|
 Advanced Member Posts: 918 Joined: 8-January 04 From: Ohio Member No.: 279 |
if you go here http://gadgetheads.com/ps7/
jon has info on discharging the flash cap in the vivitar slave flash units I don't see why the same couldn't be done in your case Attitudes are contagious...is yours worth catching?
I am NOT a HillBilly......I am a Appalachian American ~knobby |
|
|
|
|
Jan 23 2004, 12:36 PM
Post
#4
|
|
 Advanced Member Posts: 192 Joined: 6-August 03 From: East Texas Member No.: 107 |
Radio Shack has 2-packs of 100-ohm, 1-watt MOF resistors, RS part number 271-152. If they don't have them, you could also use the 271-153 which are 1000-ohm. These should serve the purpose.
One should work fine, but since you bought two, you may as well wire the two resistors in series, and solder a piece of insulated wire on each end of the pair of resistors (6 or 8 inches should be plenty). Put heat-shrink over the resistors and the bare wires, and put an insulated alligator clip on the ends of the wires. It'll only take a few seconds (max) to discharge the flash cap to a safe value when you clip the alligator clips to the two capacitor leads. If the leads slip and short out, you will have an exciting *BANG*. Note: if the flash cap is charged to 330 volts, the pair of 100-ohm resistors will be momentarily dissipating over 500 watts! I have never had a problem using metal-oxide-film (MOF) resistors for this sort of thing, but carbon-film resistors will evaporate into a puff of smoke if you try it with them. So, the type of resistor is important. |
|
|
|
|
Jan 23 2004, 12:40 PM
Post
#5
|
|
 "First Leper in the Colony" Posts: 7,414 Joined: 17-July 03 From: NW Arkansas Member No.: 3 |
I like your discription of the carbon resistors Jon.
Butch
I'm an Engineer. Engineers build civilizations – I leave it to politicians to destroy them - Melanie "the Republican brand is in the trash can...if we were dog food, they would take us off the shelf.- Rep. Tom Davis Ignorance begets fear Fear begets anger Anger begets hatred |
|
|
|
|
Jan 23 2004, 08:34 PM
Post
#6
|
|
 Advanced Member Posts: 11,152 Joined: 3-November 03 From: Lone Star State Member No.: 215 |
I like to let them pop, tough on aligator clips though.
|
|
|
|
|
Jan 23 2004, 08:37 PM
Post
#7
|
|
 Advanced Member Posts: 1,979 Joined: 17-July 03 From: Illinois Member No.: 7 |
I like using fingers. Ouchhh. No Jon has the right idea but then I tape them up on the board when I have it open. MC.
Live to Hunt
|
|
|
|
|
2 User(s) are reading this topic (2 Guests and 0 Anonymous Users)
0 Members:
Skin by: SbyD © all rights reserved.
| Lo-Fi Version | Time is now: 29th July 2010 - 09:23 AM |