From: Mike.Wich@cl-image.uu.holonet.net (Mike Wich)
Subject: WTB: C64 power converter
Newsgroups: comp.sys.cbm
Date: 17 Nov 96 04:12:56 
Organization: Classic Image BBS-Las Vegas-(702)247-6393
Path: nntp.hut.fi!news.csc.fi!news.eunet.fi!EU.net!newsfeed.internetmci.com!uunet!in3.uu.net!holonet!colossus.holonet.net!cl-image!mike.wich
Message-ID: <1bb_9611170633@cl-image.uu.holonet.net>
X-FTN-To: Jerome Wieber
Lines: 108

If you need a new power supply for your
c-64 this is the circuit for you
It's inexpensive & easy to build.
The power requirements for the c-64 are
as follows:
 
5v dc @ 2A  and  9-12 vac @ 1-2A
 
the 5V supply must be well regulated
to 5V +- .25 V
                                        PARTS:
 
T1 120 to 9V @ 3A transformer with 2 9V
secondarys. if you can't get a
transformer with 2 secondarys then use
2 9V transformers one for dc and one 
for ac
 
BR1 bridge rectifier 100 volt @ 5Amp.
or higher
 
Q1 any pnp power transistor 5anp or
higher 30 volt or higher or MJE34 or
MJ2955 
 
ic 7805 or eqiv. voltage regulator
 
c1 1000 mfd 35 volt capacitor
 
c2 100 mfd 25 or 35 volt capacitor
 
r1 3 ohm 5 watt power resistor
 
--------------------------------------
          schematic diagram
 
---------------------------------------
                                               t1                             
 120v                                
       *--- 9VAC                     
   --* *---                          
  T1 *                   continued at
   --* *-++-----O------a a below     
       *-++---  I                    
         BR1 I  =C1                  
             I  I                    
             G  G                    
        c  e                         
      ---+ I--------                 
      I  --- Q1    I                 
      I b I        I                 
      I   I  7805  I                 
      I   I  ------I 5v              
   a--OxxxO--l ic lO----O------- + 5v
            i------ o   I    --- -   
       r1      Ig       = c2 I       
               G        I    I       
                        G    G       
the connector on the c-64:
 
 
            6     7           
       9Vac---.U.---9Vac      
             .   .            
              . .             
             I i              
            2I I5             
             I I              
             - +              
            5Vdc              
---------------------------------------
 
NOTES:
 
G circuit ground
= capacitor
xxx resistor
                                         -+ I- transistor
  ---  c= collector  e= emitter  b=base
   I
 
    ------
 ---I    I---  voltage regulator
 in ------ out
      I
      G
 
       *----
   --* *---- 9v
     *          transformer
   --* *----
       *---- 9v
 
      ++  bridge rectifier
      ++
 
use adequit heat sink on Q1 it will 
get HOT!!!
-------------------------------------
I hope this helps. Commodore uses some
wierd numbering on there connectors
I know this works. I built my own 
--
;|Fidonet:  Mike Wich 1:209/308
;|Internet: Mike.Wich@cl-image.uu.holonet.net
;| Standard disclaimer: The views of this user are strictly his own.
Classic Image BBS-Las Vegas (702)247-6393 <> Internet Gateway 1:209/3081
Mike.Wich@cl-image.uu.holonet.net