Led and Zener Diode Tester
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This device displays the forward voltage of an LED or Zener diode. Assembly is straightforward—use the included wiring diagram for reference.
Safety Warning:
Li-Po batteries can be hazardous if mishandled. Always use a proper charger board, observe correct polarity, and never short-circuit, overcharge, or leave the battery charging unattended. Discontinue use if the battery becomes hot, swollen, or damaged.
IF YOU ARE NOT FAMILIAR WITH HANDLING LI-PO BATTERIES, SEEK ADVICE FROM A KNOWLEDGEABLE TECHNICIAN. IMPROPER USE CAN CAUSE FIRE OR INJURY.
Components required:
- 2 × M2 × 5 mm hex cap screws
- 1 four-digit voltmeter with isolated 3-wire power supply
- 1 boost converter (XL6009)
- 1 Li-Po charger board
- 1 × 10 kilo-ohms resistor (1/2 W)
- 1 Li-Po battery (~600 mAh)
- 1 tactile switch (12 × 12 mm, 5 mm button height)
- 2 alligator clips (red for +, black for –)
- Assorted wires (red and black recommended)
- Heat-shrink tubing
- Glue (hot glue recommended)
Set the boost converter output to approximately 30 V. Include a strain relief for the probes, such as a knot in the wire. Glue the battery in the back of the Electronic Layer.
Support material is not required. An infill of 20% is recommended.
This object was designed using Solid Edge Community Edition.
Printable Files
 | Front Case with Markings |
| | Plain Front Case |
| | Back Cover |
| | Electronic Component Holder |
This object is also published on the following site(s):
* Thingiverse
* Prusa Printers
* MakerWorld
The source files are available:
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Copyright 2012-2025 by Claude “Tryphon” Théroux