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  The Chehalis Valley
 Amateur Radio Society
A  501(c)(3) Non-profit 		          
 
 

Electronics Workshop - January 25, 2024

Time & Location:

Topics:
  1. Transistor Testing
  2. Sealed Lead-Acid Battery Charger
  3. Handheld Transceiver Lithium-Ion Battery Charger
  4. LED Tester

  5. Potpourri: Non-Contact Voltage Tester

Notes:
Transistor Testing:
  1. "PRESTO! Transistor Checker from VOM":
    https://archive.org/details/73-magazine-1975-06/page/144/mode/1up
  2. "Simpson 260-8 VOM":
    https://simpsonelectric.com/products/test-equipment/vom-multimeters/260-8-260-8p/
  3. "How to Measure Transistor Leakage and Gains for Germanium, Silicon, and Sziklai Pairs":
    https://youtu.be/bzWBbVPgDOo
  4. "Darlington Transistors" (includes a discussion of Sziklai transistor pairs):
    https://www.electronics-tutorials.ws/transistor/darlington-transistor.html
  5. "Darlington vs. Sziklai Pair":
    https://circuitcellar.com/resources/darlington-vs-sziklai-pair/
  6. Forrest Mims' "Engineer's Mini-Notebook":
    http://www.n5dux.com/ham/files/pdf/Forrest%20Mims%20-%20Schematic%20Symbols,%20Device%20Packages,%20Design%20And%20Testing.pdf
Sealed Lead-Acid Battery Charger:
  1. "Panasonic LC-R123R4P Data Sheet":
    https://api.pim.na.industrial.panasonic.com/file_stream/main/fileversion/3543
  2. "Optim Engineering CBA III":
    https://simpsonelectric.com/products/test-equipment/vom-multimeters/260-8-260-8p/
  3. "Gel Cell Charger/Maintainer":
    https://www.angelfire.com/electronic2/qrp/charger.html
Handheld Transceiver Lithium-Ion Battery Charger:
  1. "TYT-368 Charger Modification":
    https://harbeck.dk/electronics/tyt-md390-charger/
  2. "XL4001 Buck DC/DC Converter":
    https://datasheet.lcsc.com/lcsc/2203291430_XLSEMI-XL4001E1_C2988027.pdf
  3. "LM358 Dual Operational Amplifier":
    https://www.ti.com/lit/ds/symlink/lm358.pdf
  4. "MB10F Full-wave Bridge Rectifier":
    https://www.diodes.com/assets/Datasheets/MB10F.pdf
  5. "Surface Mount Resistor Code Calculator":
    https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-smd-resistor-code
  6. "Colour Code used on Welwyn Band-marked Resistors":
    https://www.ttelectronicsresistors.com/pdf/application_notes/Resistor%20Marking%20Codes.pdf
LED Tester:
  1. "Typical IV Curves For Various Colours of LEDs":
    http://lednique.com/current-voltage-relationships/iv-curves/
  2. "Loadlines For Various Resistors on 5 V Supply":
    http://lednique.com/current-voltage-relationships/loadline-resistance-graphic-tool/
  3. Wikipedia "Current Source":
    https://en.wikipedia.org/wiki/Current_source

Potpourri:
Non-Contact Voltage Tester:
  1. "Klein Tools Non-Contact Voltage Tester Pen, NCVT-1":
    https://www.kleintools.com/catalog/electrical-testers/non-contact-voltage-tester-pen-50-1000-volts
  2. "How Does a Non-Contact Voltage Tester Work?":
    https://www.electricalknowledge.com/electricians-tools/how-does-a-non-contact-voltage-tester-work/

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