Lab #2 – Power Supply

© Bob York Back to TOC 2

© Bob York Back to TOC 3 Linear Power Supply

© Bob York Back to TOC 4 Rectifier/Regulator Circuits V out R Unregulated DC Voltage-controlled resistor I out V ref T/2

© Bob York Back to TOC 5 Power Transformer Assembly In-line fuse holder AC Power cord Transformer Primary Secondary Power switch Earth ground 9 VAC 120 VAC 240 VAC Blue Red Black Yellow 9 VAC Jameco VAC 9 VAC Blue 9 VAC Black Blue Blue w/ Stripe Stancor P A On/Off Fuse AC power Earth ground

© Bob York Back to TOC 6 Full Schematic

© Bob York Back to TOC 7 PC Board

© Bob York Back to TOC 8 Separate individual pins for test points

© Bob York Back to TOC 9 Rectifier Plus Capacitors Cathode 1A On/Off Fuse AC power Earth ground GND C1C1 RLRL 0.1Ω C3C3 +Rect -Rect RsRs V out Long-lead is “positive” “-” sign on package indicates “negative” lead Value and voltage rating printed on package

© Bob York Back to TOC 10 LM317 Regulator “Wiper”

© Bob York Back to TOC 11 Scope Grid