Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Erase memory with UV-light

Status
Not open for further replies.

Ludvig

Junior Member level 2
Joined
Mar 24, 2002
Messages
21
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
104
hobby uv eraser

Hi
Tried to erase a eprom 27c64 trough the window with UV-light from a "sun-lamp". The lightsource works well to make PCB with photores. Distans from lamp 25 cm. Time 1 hour. BUT NOTHING HAPPENS IN THE MEMORY. Its still programmed with old info instead of all High or all Low.
Whats wrong???? :(
Rgds
Ludvig
 

techie

Advanced Member level 3
Joined
Feb 5, 2002
Messages
839
Helped
58
Reputation
116
Reaction score
9
Trophy points
1,298
Location
Pakistan
Activity points
7,800
27c64 erase

I think the SUN Lamp is Infra Red, not UV. UV light is distictively bluish purpulish in color and is very very dangerous to eyes. For erasing you need a commercially avaialble cheap eraser that uses high intensity UV light. It can erase a 27c64 in 5 to 10 minutes.
 

sc/mp

Full Member level 2
Joined
Feb 10, 2002
Messages
128
Helped
7
Reputation
14
Reaction score
6
Trophy points
1,298
Activity points
1,054
build uv eraser

Hello

Erasing EPROM needs UV-B. These wavelenght are bad for skin
and eyes so SUN lamps filter them if they produce some.
SUN lamp produce UV-A.

You need a lamp emitting UV-B and protect tour eyes !

Regards
 

sc/mp

Full Member level 2
Joined
Feb 10, 2002
Messages
128
Helped
7
Reputation
14
Reaction score
6
Trophy points
1,298
Activity points
1,054
.... I forgot some numbers :

UV-A 400nm to 315nm
UB-B 315nm to 280nm
UV-C 280nm to 100nm

Bye !
 

Ludvig

Junior Member level 2
Joined
Mar 24, 2002
Messages
21
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
104
Erase

That clarifyed why i couldnt get it to work.
THANKS
Ludvig
 

lwecen

Newbie level 6
Joined
Apr 12, 2005
Messages
14
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,429
commercially eraser normally costs how much? I would like to get one, but still looking for it. Any suggestion?
 

lwecen

Newbie level 6
Joined
Apr 12, 2005
Messages
14
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,429
Thank you, but I'm not going to build it myself. Any recommendation for commercial eraser?
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top