Press "Enter" to skip to content

Unusual, but accurate low voltage probe (with schematic)

Keep in mind that some comparable devices do not have the very same great precision.

The only factor I can consider for the enigma diode in between the input as well as outcome of the regulatory authority is for the little present leak through the feeling resistor, that may turn around predisposition the voltage regulatory authority if the probe was gotten in touch with the incorrect polarity.

An unusual electric probe from, that might be intended mostly at car usage, however most likely has various other applications. An alongside examination with a Fluke meter revealed a precision within 0.1 V throughout the complete array.

The listing this probe originated from had the complying with summary:-.
” 12V Circuit Tester Probe 3-24v Electric Car Fuse Test Light Voltage Pen Detector”.
I paid ₤ 8 for mine comprehensive of delivery.

The voltage array mentioned on the product packaging is 3 to 36V, however I would certainly advise 35V tops, and also ideally reduced as a result of making use of a typical 3.3 V regulatory authority.
The wiring is remarkable for using what I think is tri-state multiplexing (charlieplexing) to drive the LED display screen, suggesting that the 3 figures can be managed by simply 6 links.

The red lead is unfavorable and also the black probe declares … So luckily it does have polarity security and also an LED to show polarity. Oddly, eco-friendly ways incorrect polarity and also red ways proper polarity.


If you take pleasure in these video clips you can aid sustain the network with a buck for coffee, cookies as well as arbitrary devices for disassembly at:-
This additionally maintains the network independent of YouTube’s formula peculiarities, permitting it to be a little bit extra rowdy and also hazardous.