FWARC Topics Index

04/20/2021 >> Revised 09/13/2023


Looking Back a Few Years

Early Logic

Study Guides for HAM Radio Licenses

New Total Re-Write of the "Sound_Bites" (>2,000 Sound Bites @ 8 different WPM Speeds)

08/27/2020 - "Tech Net" - The Description of the Schematic in QST-BYI--Sept, 2020 - Page 30

"TTL Thresholds"

09/10/2020 - Club Meeting: "The Two Puzzles" ( ~5 minutes)

"ELI" for Pure Inductance (90 Degree Phase Shift)

"ICE" for Pure Capacitance (90 Degree Phase Shift)

09/10/2020 - Club Meeting: "Neat Tricks"

Db's without calculators or formulas ("Interpolating", a technical word for educated guessing)

Estimating Parallel Resistors without formulas or calculators

(also, see Estimating in "Solutions-For-Education.com")

09/24/2020 - "Tech-Net" Explaining Reactance

Static vs Dynamic Considerations (pdf / html)

10/22/2020 - "Tech-Net" Introduction to Gate Functions, Logic Functions

11/19/2020 - "Tech-Net" Taking advantage of the MFJ-269 and other Antenna Analyzers

01/28/2021 - "Tech-Net" Review of Series and Parallel Circuits, especially the Ladder Circuit

03/25/2021 - "Tech-Net" A Glimpse at Power Supplies - Switching_Power_Supplies - (Talking Points)

04/22/2021 - "Tech-Net" The Astron 35 A/M Power Supply    (Talking Points)

04/27/2021 - "Tech-Net" "Controlling 'Constant Current Sources' to 'Capacitors and Inductors' "

More Detailed Gate Descriptions and Schematics with Labs

Gating Logic - Functions - Coincidence - Controls
Initial By Functions Multiple Inputs Multiple Controls
Basic Gates Gate Functions Coicidence Gating Enable and Inhibit Controls
Enable and Inhibit Controls
Enables Example 1 Example 2 Example 3 Example 4
Inhibits Example 5 Example 6 Example 7 Example 8

 "Muti-Mode-Keyer" - Circuit Description, Schematics, Software

Tri-Mode Keyer Version History
Early Tri-Mode
before 1973		 Tri-Mode
1973		 Current
with Arduino		 Current
44-Pin Cards		 Current
44-Pin Cards & CPU
"Tri-Mode" Wire-Wrap (Transistorized) "Tri-Mode" - TTL Logic Module with Mega Timing Logic_Module, & Timing_Module Logic_Module & Timing_Module with CPU (extra inputs & control)

 

Next "Digital Lab" Pages:
=====================================================
DigitalLabs2 - Connective Gating of NAND's NOR's

DigitalLabs3 - Exclusive-OR Circuits

DigitalLabs4 - Data Latches & R-S Flip-Flops

DigitalLabs5 - J-K Flip-Flop Considerations

DigitalLabs6 - Timer Circuits - One-Shots/Single-Shots, Free-Running