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 Forum index » DIY Hardware and Software » Microcontrollers and Programmable Logic
DIY EEPROM programmer?
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droffset



Joined: Feb 02, 2009
Posts: 486
Location: new zealand
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PostPosted: Thu Mar 25, 2010 8:22 pm    Post subject: DIY EEPROM programmer? Reply with quote  Mark this post and the followings unread

This is a looong way off for me, but in the future I'd like to try making the midi->CV portion of the Paia Fatman in page 4 of the documentation here:
http://www.paia.com/fatman.asp

Really just because I have all the ICs involved already, so might as well try it.

EEPROM programmers are expensive, so has anyone succeeded in making one?

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Danno Gee Ray



Joined: Sep 25, 2005
Posts: 1341
Location: Telford, PA USA

PostPosted: Fri Mar 26, 2010 4:08 pm    Post subject: Reply with quote  Mark this post and the followings unread

You can buy a Willem Eprom programmer on Ebay dirt cheap. Waaay less than the cost of parts. I got one for around 30 bucks including shipping.
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reve



Joined: Feb 23, 2008
Posts: 147
Location: USA

PostPosted: Mon Apr 12, 2010 8:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

If you're really lazy you could just pay someone to burn you the eeproms. I've used this guy who's both friendly and fast:

http://www.eprompro.com/
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CYBERYOGI =CO=Windler



Joined: Aug 05, 2012
Posts: 9
Location: Germany

PostPosted: Sun Aug 05, 2012 9:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

Many Willem eprommers (e.g. my Willem PRO 4 isp) make trouble with reading or writing non-CMOS parts (old EPROMs, MCS-48 microcontrollers of Casio keyboardss etc.) due to weak voltage switching transistors those cause a voltage drop >0.5V.

You have to replace tiny SMD (or other weak) versions with a power transistor or even a relay switched by the original transistor to stabilize the voltage output.

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