| Author |
Message |
    
Nickle
Junior Member
Username: Nickle
Post Number: 33
Registered: 5-2005
| | Posted on Tuesday, July 26, 2005 - 8:05 am: | 
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I just received a home brew amp from sister in florida. the thing has a on&off switch only. I opened it up and it has 4 pt-2sc2879s my question is this good or should i take it to tech. and mod the amp another way? Also what should this thing do,how many amp power supplydo i need?etc. etc,etc. nickle |
Bruce
Senior Member
Username: Bruce
Post Number: 2984
Registered: 9-2003
| | Posted on Tuesday, July 26, 2005 - 10:07 am: |
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Better leave it alone thoes are good transistors and 4 of them will give as much as 400 PEP. |
Bigbob
Senior Member
Username: Bigbob
Post Number: 2081
Registered: 12-2001
| | Posted on Tuesday, July 26, 2005 - 11:09 pm: |
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OOOOh man,4 2879s as much as 50 amps maybe 60,get a big one.A tripplite 60 only puts out 42 amps continuous,get 2 and run in paralell or put in mobile and use 6 gauge wire.Bigbob |
Nickle
Junior Member
Username: Nickle
Post Number: 34
Registered: 5-2005
| | Posted on Wednesday, July 27, 2005 - 9:26 am: |
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Well bigbob if i go mobile,do i go strait to the battery with pos&neg? I have a 95 honda accoord.Or does this mean a whole lot of extra trouble and MONEY!!!? I don't think i can take a whole lot of either. nickle |
Patzerozero
Senior Member
Username: Patzerozero
Post Number: 1098
Registered: 7-2004
| | Posted on Wednesday, July 27, 2005 - 10:55 am: |
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with ANY amp ALWAYS go straight to battery. 1st gotta see what size alternator accord has. if it's less then 75 amps, your 4 transistor amp(it is 4 ONLY, right? no extra 2 sc 2290 driver transistor in front of the 4???) is gonna be borderline TOO MUCH if you have ANY accessory on(headlights, heater, wipers, etc) also, what radio you gonna be usin' with it? amp can PROBABLY handle 10 watts dead key from radio & up to 35 watts pep. BUT best way to test is to start with LOW dead key, like 2 or less & turn it up til you get about 125 watts carrier from amp, stopping at 8 or 9 watts if you DON'T get that much. swing should be anywhere from 400 to 800-there is probably NOTHING you can do to increase it if it falls towards the lower end, & if it's to the high end it was probably built by somebody who knew what they were doing. if it's in that range-YOU'RE GOOD! |
Bigbob
Senior Member
Username: Bigbob
Post Number: 2085
Registered: 12-2001
| | Posted on Wednesday, July 27, 2005 - 8:20 pm: |
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6 gauge wire is about the same or is the same as your battery cables,forget what I said about 2 supplies run 3 pr60s,or build yourself one from a 125 amp battery charger,they usually have a 300 amp surge,but you'll need at least twenty 30 amp pnp pass transistors and a 1 farad filter cap,like a stinger,3 ten ohm wirewound resistors a 317t regulator(with assosiated parts and board) and 2 .047mfd caps and if you're interested,I can e-mail you a schematic.Kind of a pricy unit but you'll have a king-kong of a power supply.With twice as many pass trans.,this could easily hammer out 500 amps,man-o-man run a sweet 16 on your base,oh and by the way get a 220 charger,won't be so hard on the electric bill.Bigbob |
Nickle
Junior Member
Username: Nickle
Post Number: 35
Registered: 5-2005
| | Posted on Thursday, July 28, 2005 - 4:53 pm: |
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bigbob that would be great.I am going to starte to try to build a few things to try to stay busy.i may not understand all the tech. end of it but i'm prety good putting things together. thanks nickle |
Bigbob
Senior Member
Username: Bigbob
Post Number: 2111
Registered: 12-2001
| | Posted on Saturday, August 06, 2005 - 8:00 am: |
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You won't like me,lightning zapped my scanjet 4400c and I don't know how to send you a copy of schematic,if you got any ideas I'm open to them.Bigbob |
Nickle
Junior Member
Username: Nickle
Post Number: 38
Registered: 5-2005
| | Posted on Sunday, August 07, 2005 - 2:28 pm: |
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I guess you could email me and then i can email my mailing address to you. |
