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Hi Low Detector SMD Trainer Kit

Hi Low Detector SMD Trainer Kit

Regular price £2.99 GBP
Regular price Sale price £2.99 GBP
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With this kit by MitchElectronics, practice your soldering skills as you build a fully controllable Hi/Low Detector. RoHS and REACH compliant, ideal for classrooms and workshops, and superb for beginners looking to improve their soldering skills!

This kit is part of the SMD Trainer range that only uses SMD parts to test out your soldering skills. With this kit, build a Hi/Low detector that can alert you when a signal is either too low or too high. Two on-board LEDs indicate whether the signal is too low or high, and two potentiometers provide full control of the high and low detection levels.

Before making this kit, be sure to read our SMD soldering guide found in our resources page, and pay extra attention when positioning components because de-soldering SMD parts can be extremely challenging.

Product specifics

  • Component Count: 16
  • Battery Powered: Yes
  • Operating Voltage: 5V to 16V
  • Operating Frequency: N/A
  • Dimensions (PCB): (30mm x 19mm)
  • Mounting Holes: 4 x M2 (26mm x 15mm)
  • Prebuilt: No – Kit form
  • Batteries Not Included

Included in this kit

  • 1 x LM358 Op-Amp
  • 1 x 100nF Capacitor
  • 2 x 100KΩ Potentiometer
  • 1x 100RΩ Resistor
  • 2 x 1KΩ Resistor
  • 4 x 10KΩ Resistor
  • 2 x Red LED
  • 2 x MMBT3904 Transistor
  • 1 x 1N5817
  • 1 x Red Wire
  • 1 x Green Wire
  • 2 x Blue Wire
  • 2 x Black Wire


The Hi/Low Detector SMD Trainer is an excellent kit for testing soldering skills, especially with the potentiometers and the MMBT3904 transistor (as these are very small). Regarding practical applications, this small module is great for scenarios where some control signal needs to be maintained at a specific level (such as a temperature-controlled environment). The high output can be used to control devices, while the low output can be used to enforce a safety system or failsafe. For example, a green house that gets too hot can use the high output to open the windows, but if the temperature falls too low, then the low output can be used to engage a heater.


Note that product specifics such as output frequency depend on the tolerance of the components. The numbers provided here are an approximation only.

All parts sold by MitchElectronics are compliant with RoHS and REACH directives which ensure that they can be used in commercial environments as well as complying with environmental laws.


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