By connecting two probes at two distinct points in a circuit, or essentially acting as a contact voltage detector, we may sense voltage in a circuit using a multimeter.
Non-contact voltage detectors are also a thing in this time period. You could just purchase one, but an electronics fanatic wouldn’t find that interesting.
Components Required
- BC547
- 1M ohm resistor
- 100K ohm resistor
- 39K ohm resistor
- 5mm Red led
- 9V battery and battery connector
Connections and Circuit Diagram
Four transistors are coupled in cascade style in the circuit for the emf detector. The gain can be increased by connecting transistors in cascade form. The overall gain is a result of the individual gains of each transistor, which in turn turns on the led.
Building a circuit on a breadboard is always a good idea.
Fitting in a Enclosure
Now that everything has been gathered into an enclosure, drill two holes: one for the LED and one for the momentary switch.
The project is finished once the momentary switch is solidly mounted to the board and the battery is connected.
Conclusion
Finally, we have completed designing our EMF Detector. Superkitz will be back soon with more informative blogs soon.
