HAM RADIO
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Minty Kool Keyer
A 3-IC Fully-Iambic Electronic Keyer with Dot/Dash Memory and
Progressive Weighting ...and much more!
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Pleasant CPO
An Amplified Shaped Sine-Wave Morse Code Practice Oscillator
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Depot Cootie
An Easy-to-Build Single-Lever "Side Swiper" Paddle made from parts from your junk bin or local hardware store. Hundreds of satisfied Depot Cootie builders, world wide!
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Curiously Narrow Filter
Cut out the QRM & QRN with this multiple-stage CW Audio Filter.
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NM7T "OZ" CW Keying Mode Adapter
CW Squeeze Keyer Input Adapter based on the MSK-5
(by Brian Kelley, NM7T.) This adapter will add "dit insertion" mode operation ("OZ" mode) to most keyers. | PRACTICAL
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How To.. Breadboards,
Flashing LED's & A
555-Based Timer
Let's get started in electronics! No soldering initially required.
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Low-Volts Battery Cutoff Device - Intro to Comparators
Comparators
and OP amps are essential and ubiquitous in useful electronics.
Build this low-voltage battery saver cutoff circuit which
also employs a neat relay trick.
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RF Peak Voltage Detector
Begin to learn the fundamental dynamics of Radio Frequency energy and try out a few enlightening experiments.
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One-IC Transistor Tester
With just one 556 dual timer IC, never be left scratching your head over mystery transistors.
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LED's - Current & Control
RGB LED's are awesome, but non-linear devices. Learn how to dim to your whim.
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The Wheatstone Bridge
Learn of electrical fundamental relationships and ID some caps.
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The Cat-Bird
Build
this classic audio oscillator circuit and start your menagerie of sound
effects. Learn a bit about oscillator topologies.
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Power Bank Auto-Shutoff Disabler
Ever
been frustrated by your Li-ion power bank mysteriously shutting off
while powering your latest low-power homebrew gadget? Discover
how to keep the power flowing with this simple yet ingenious ATTiny85
solution!
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Li-Ion / Li-Po BMS
A small Battery Management System board capable of safely* providing portable power to your Arduino projects and more. | ARDUINO
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Programming the ATMega328p
When
it's time for your Arduino project to leave the nest, follow this guide
and you'll be running bare ATMega328p microcontroller IC's in your own
compact projects and even ditch the bootloader.
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Programming the ATTiny85
The small 8-pin cousin to the 328p, the ATTiny85 MCU is a very
useful and compact solution. Let's get setup to program them in a variety of ways, including using
a custom programming Arduino Uno shield, a Digispark clone and even build a high-voltage fuse resetter to get use of that extra I/O pin.
[Continual Updates...]
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CW Morse Decoder
K4ICY's
custom algorithm for decoding CW Morse code that copies at 0-to-70 WPM
and shows the speed and code elements all in real time! Suitable
for a 3x20 LCD text screen. Requires initial tone detection, but
great out of the box with a hand key for practice.
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Bun-Bun, A Cute Soil Moisture Indicator
Tell if your indoor plants or vegetable garden needs to be watered
or is getting too much water with this super kawaii chibi bunny face-shaped PCB project.
The ears are the probes! Uses the small ATTiny85 MCU and
runs from a small coin cell battery. Calibrates at the touch of a
button and stores the range in memory for future use. Great for
kids getting into electronics and for STEM/Science Fair applications.
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Columns for Arduino
Play the classic SEGA(R)
stacking puzzle game on any Arduino Uno or Nano! This enjoyable,
fast-paced handheld masterpiece uses 81 addressable RGB LED's, 16
7-segment display characters for info and offers stereo background
music with simultaneous sound effects, as well as rumble haptics, 4
games and high score memory. See detailed schematics... |
