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