Tech PS1 Wireless Controllers

[NeoTesseract]

Now, I'm looking at wireless controllers for an old PS1 console that I have laying around. Always wanted to solder a modchip and I don't have much going on these days where games are concerned (too many modern releases are shitty and disappointing) so I plan on amassing a "backups" collection of my favorite childhood games. However, I definitely don't plan on struggling with wired controllers anymore. So my question to you guys is the following: Do you know of any PS1 compatible wireless controllers out there? I was looking at these:

http://www.ebay.com/itm/Lot-of-2-Ma...t=Video_Games_Accessories&hash=item1e7324c3fd

But I was however looking for the analog version (if it even exists)

Please help me out anyone. Thanks