Trolley Tip - Model Trolley Power Supply - by Fred Weigle 4/6 AMPERE REGULATED VOLTAGE POWER SUPPLY REGULATED POWER SUPPLY PARTS LIST Updated 4-11-97
All Electronics Corp TX-245 FWB-250 4700 MFD-35V DCMP-470 NLTP-470 3.3K-.25W 470 Ohm-.5W 0.47 Ohm-5W See note below. LM723 ICS-14 TIP120 HS222 2N3055 HSPT-31 STS-42 STS-8 FS-2 FHPM-31 LCAC-19 Radio Shack 276-1185 272-1022 272-125 271-1714 271-1328 271-1115 271-130 5W-.1 276-1740 276-1999 276-2068 276-1363 276-2041 275-602 275-1533 270-1023 270-364 278-1255 272-707 Hosfelt Electronics Inc. 56-438, 56-194, 56-195 KBPC1502 15-545 or 15-546 15-303 CM46434 QW233 HW147 5W-.47 5W-.27 & 2W-.39 in par. LM723CN 21-266 TIP120 36-434 2N3055 26-195 51-379 51-225 31-798 43-202 60-250 T1 Dl Dl C1A & C1B C2 R1 R2, R3 & R4 R5 R6, R7 & R8 R9 (4 Amp sup.) R9 (6 Amp sup.) U1 Q1 Q2A, B & C SW1 SW2 F1 DS1 24 Volt C.T. 5 amp. 25 amp. 50 PIV Bridge 15 amp. 200 PIV Bridge 4700 uf. 35v Capacitor 470 pf. 50v Capacitor 5K Linear Potentiometer 3.3K, .25W Resistor 470 Ohm .5W Resistor 0.47 Ohm. 5W Resistor 0.15 Ohm 5W Res. 0.10 Ohm 5W LM723 Reg. I.C., I.C. Socket TIP120 Transistor Heat Sink 2N3055 Transistor Heat Sink SPST Switch DPDT Switch Center Off 2A Slow Blow Fuse Fuse Holder Line Cord Panel Lamp Use 24 V. C.T. transformer for up to 9 Amps. This transformer may not deliver full 12 volts at full current, but at 9 volts will regulate at full current. If full 12 volts at full current is desired, find a transformer that will deliver full desired current at 17 volts rms. Omit transistor Q2C and Resistor R8 for 4 amp supply. Meters and miscellaneous hardware are up to builder. Note: If a maximum current limit other than 4 or 6 amps is desired, the calculation for R9 is: (0.63) divided by the desired current limit. Example: (0.63) divided by 5 Amp. = 0.125 Ohm. You could use 0.22 Ohm and 0.33 Ohm in parallel. This would limit the current at about 4.77 amps. All Electronics Corp. P.O. Box 567 Van Nuys, CA 91408-0567 1-800-826-5432 www.allcorp.com Jameco 1355 Shoreway Rd. Belmont, CA 94002-4100 1-800-831-4242 Digi-Key Corp. 701 Brooks Ave. South P.O. Box 677 Thief River Falls, MN 56701-0677 1-800-344-4539 Hosfelt Electronics, Inc. 2700 Sunset Blvd. Steubenville, OH 43952-1158 1-800-524-6464 Mouser Electronics 2401 Highway 287 North Mansfield, TX 76063-4827 1-800-346-6873 F. Weigle 4-11-97 East Penn Traction Club