TechCrate 004 — Spooky Eyes Jack O’Lantern
TechCrate 004 — Spooky Eyes Jack O’LanternConfiguration: --
$20.99
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Build two blinking LED eyes that switch on in darkness. A 555 timer controls the flashes while a phototransistor responds to light.
Experiment kit contents
- 1 × 555 timer chip
- 1 × phototransistor
- 2 × red LEDs
- 2 × 470 ohm resistors
- 1 × 10K resistor
- 2 × 100K resistors
- 1 × 10µF electrolytic capacitor
From your Starter Kit
Breadboard, 9V battery, Battery snap connector, Jumper wires.
Subscriber instructions PDF · Build video and customer files
Optional — go further
Optional: compare resistor values with power disconnected before exploring the light-sensitive circuit. The complete build and its checks work without a meter.
🎬 1080p Workbench Demonstration & Circuit Schematics
Watch step-by-step breadboard wiring, oscilloscope waveforms, and circuit verification for experiments in this series.
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Includes high-resolution IEEE schematic diagrams, breadboard layouts, and multimeter checkpoint tables.
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TechCrate Welcome & Quick Start GuideStep-by-step unboxing checklist & breadboard layout guide.
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Resistor Color Code Reference ChartQuickly decode resistor values using color bands.
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