E-repair.org

All computers repaired. pc. s, macs, laptops, desktops, servers. old, new, slow, dead.

Upgrades carried out to memory, operating systems, etc.

Data recovery, transferral, backup. Viruses, Malware, Spyware, Trojans, Keyloggers. removed.

But after three years there realised that I never wanted to be in a " 9 to 5 " job again. So, ever since have been self-employed and highly recommend it, not least of all for the varied pieces of electronic gear that I see. Also some design/prototyping work creeps in now and again which keeps the old grey matter going.

Well it took a while to complete, but here it is, my very own Bally Centaur pinball machine. Serial number ECE2305, one of only 3700 made. Manufactured circa 1981, it is one of only two pinball machines (Centaur and Centaur II) to feature an echo on the sound; using the often missing "Say it again" board.

These machines have potentially lethal voltages (200v DC) in them and if you're not sure what you're doing find somebody who does. As most people with a Centaur know if the echo disappears from the sound it's usually down to the SAD4096 ic (at position U2 on the "Say-it-again" board). My circuit is based around an equivalent ic to the Reticon SAD4096 called an "MN3205" made by Matsushita (Panasonic). I've cobbled together my efforts on a piece of vero board (wrongly assuming the ic had a 16 pin spacing, it doesn't, it's 14 pin).