mofo@bucsf.bu.edu (jason greene) (01/31/91)
I am in great, exasperating need of a power supply for the A590 hard drive.
I was told by a local shop that a replacement transformer/cable deal
would cost me $158.00
This is not a bargain...
There MUST be a way to get one cheaper than this...... HELP!
--
___________________________________/V\ofo______________________________________
"Hey! Wooly's gone apeshit, man!" -Dawn Of The Dead
mofo@bucsf.bu.edu 1039 Comm Ave #24, Boston, MA 02215
Jason Kekoa Greene, Boston Schmoo-niversity. Class of Ninety-something?
I'll tell you what my major is when my vacation ends.
____________________________The Psychic Gorilla________________________________bpv9073@sjfc.UUCP (Brett VanSprewenburg) (02/06/91)
In article <MOFO.91Jan31003714@bucsf.bu.edu> mofo@bucsf.bu.edu (jason greene) writes: >I am in great, exasperating need of a power supply for the A590 hard drive. > >I was told by a local shop that a replacement transformer/cable deal >would cost me $158.00 > >This is not a bargain... > >There MUST be a way to get one cheaper than this...... HELP! >-- Yes, there is. A while back I posted this to the I-AMIGA net on BITNET, and with this topic raising it's head, I thought it might play well here now. Here goes.......begin included text.......... This is not meant to be an abuse of the network for my personal gain, I am not somebody who's out to take you and your hard earned money for a ride. I am doing this for the good of the Amiga Community, as I am a part of it myself. :-)! Ok, here's the scoop on the CBM stock power supplies, for the A500, verses the ones that I build. My basic unit is a 64 watt supply with more then 7 amps available at 5 volts and 2 amps at 12 volts. Compare this to the 35 watts of the CBM supply with 4.3 to 4.5 amps at 5 volts and only 1 amp at 12 volts. Oh, lets not forget the negitive voltages either. The A500 only needs -12 volts and my 64 watt supplies put out .25 amps at this level, compared to .10 amps with the stock A500 supply. Ok, but now lets take a look at that in chart form, just like the stats on Sunday football. CBM stock unit My replacement unit -------------- ------------------- Max Wattage: 35 63.5 Amps at 5 volts: 4.3 to 4.5 7+ Amps at 12 volts: 1.0 2.0 Amps at -12 volts: .10 .25 Fan cooled? No Yes Overload and Short-out protection circuitry? ????? Yes Plug-n-Play? Yes (of course) Yes Keep up with future expansion? Not really Yes* Standard IB* supply? No (of course) Yes * That's within reason. Don't expect to be able to power your entire system and a harddrive subsystem (ie, one WITHOUT a power supply). Besides, all A500 expansion boxes (on 86 pin edge connecter) come with their own power supply) This supply is not designed to handle all of that. However, larger supplies (ie. 100 or 150 watt systems) can be made at an added cost, but what I offer here is the best deal in light that the items that draw the most power on an A500 system come with THEIR OWN power supplies. On with it... What advantages does my supply give you? Well, the stock A500 supply is only designed to power (1) an A500 (2) an A501 and (3) one external drive. That's it. Nothing more. The stock A500 supply is maxed out here. Now, I don't know about the rest of you, but I wanted a little bit more from my computer. Ok, you've got the exact set-up I just mentioned, so my new supply wouldn't benefit you...WRONG. How do you think your computer sends messages to your modem or printer or DigiView or whatever. Electricity, of course. But your stock CBM supply is already at max with your above configuration...so it strains for those last few amps or milliamps it needs to run your additional hardware. Not good; for your power supply or your computer which is now short a few electrons. Ever read the power requirements sticker on the bottom of your A500...mine says max current draw 4.5 amps, which happens to be the EXACT MAXIMUM output of the stock supply. Ok, I've beaten that subject enough, you get the point. I am using one of my 64 watt IB* supplies right now, have been for a couple of months now. I personally power my A500, an AdRam 520 fully populated with 2 megs of memory, an external MAST enhanced Unidrive with track display, a 2400 modem, a color printer, a Xetec harddrive controller with optional SIMM memory board (soon to have another cheap meg of SIMMS on it) all with no problems what-so-ever. I have sold 2 of them to other people who are also using them with no problems, but I don't know their configurations, except that one of them has 3 drives and the other has a 4 meg BaseBoard. If you've never seen an IB* supply, they're fan cooled, have a nice big red paddle switch, are about twice the size of the stock supply, are silver metal boxes that look really macho with bright yellow warning stickers on them in 5 languages. (No, they're not dangerous. The warnings are to stay out of it's insides while it's running. Believe me, I'm careful!!) Ok, here's my pitch. My supplies (63.5 watt, close enough to 64...) are plug and play with the Amiga 500 and are a perfect replacement for the stock unit. I don't suggest that you power you're computer+harddrive with this unit, but all the A500 harddrive systems come with their own supply (or a recommended one) for good reason obviously. I will modify an IB* 64 watt supply and send it to you (UPS), with a 30 day replacement guarantee if the supply should fail (which I fully test on my machine before I ship them) for $39 including shipping. (The odd amount is to account for my shipping costs above what it costs me in time and materials to make these units) Thanks for listening. ==Brett ...uupsi!cci632!sjfc!bpv9073 OR cci.com!sjfc!bpv9073@cci632 phone (716) 223-1912 OR (716) 248-0982