MitchElectronics
Hi/Low Alarm
£6.99
20 items in stock
The Hi-Low Alarm Kit lets you build a device that triggers an alarm upon detecting if an input voltage has become too small or too large. RoHS compliant, REACH compliant, and perfect for beginners and those needing a practical alarm circuit!
- Product Code
- HILOW-ALARM
- Manufacturer
- MitchElectronics
- Manufacturer Part Number
- HILOW-ALARM
- Category
- Blue Kits
- Country of Origin
- United Kingdom
RoHS: YesREACH: YesCE: YesUKCA: Yes
Overview
Product Description
The Hi-Low Alarm is a DIY electronics kit that sounds a beeper when the input voltage to the circuit has become either too small or too large. The use of two onboard potentiometers allows for setting the detection voltages, and a third potentiometer allows for changing the rate of the beeper. At the same time, two outputs are provided (indicating a high or low alarm), and these can be connected to other external circuits such a relays and microcontrollers.
This kit is powered by a separate 5V supply, and this can be provided with the use of either the Simple Power Supply kit or the Simple Power Module SMD Trainer. The voltage being monitored is provided separately to the power supply, and this input has a 100Ω series protection resistor to protect against sudden current spikes.
This kit is powered by a separate 5V supply, and this can be provided with the use of either the Simple Power Supply kit or the Simple Power Module SMD Trainer. The voltage being monitored is provided separately to the power supply, and this input has a 100Ω series protection resistor to protect against sudden current spikes.
Resources
Instructions & Documentation
Technical
Product Specifications
- Assembly
- Kit form
- Prebuilt
No
- PCB Dimensions
- 81mm x 35mm
- Mounting Holes
Yes
- Battery Powered
No
- Component Count
- 26
- Battery Included
No
- Operating Voltage
- 5V
- Operating Frequency
- N/A
- Mounting Hole Details
- 4 x M4 (73mm x 27mm)
In the box
Included With This Product
| Name | Quantity | Reference |
|---|---|---|
| 8 DIP Socket | 1 | U1 |
| 14 DIP Socket | 1 | U2 |
| LM358 | 1 | U1 |
| 4093 | 1 | U2 |
| 100Ω Resistor | 2 | R1, R6 |
| 1KΩ Resistor | 4 | R5, R7, R8, R9 |
| 10KΩ Resistor | 2 | R3, R4 |
| 100KΩ Resistor | 1 | R2 |
| 10KΩ Potentiometer | 3 | RV1, RV2, RV3 |
| 100nF Capacitor | 2 | C2, C3 |
| 100µF Capacitor | 1 | C1 |
| Red LED | 2 | D2, D3 |
| 1N5817 | 1 | D1 |
| 2N3904 | 3 | Q1, Q2, Q3 |
| Buzzer | 1 | BZ1 |
| Red Wire | 1 | J1 |
| Green Wire | 1 | J2 |
| Black Wire | 2 | J1, J2 |
| High/Low Alarm PCB | 2 | J1, J2 |
More information
Applications
- This kit is excellent for those who need an alarm that monitors a sensor, voltage, or even a current (with the use of a current-to-voltage converter). For example, this kit can be used to detect if a door has been left open, the current level of fluid in a tank, or the position of a potentiometer (such as a control knob). This is also ideal for those who want to learn about voltage detectors, comparators, and logic circuits that convert analogue signals into digital signals. Finally, the Hi-Low Alarm is great for those learning electronics and those who want to get some soldering practice.
- Education and training – Useful for teaching comparators, window detection and threshold alarms, while providing practical experience with through-hole soldering, component identification and PCB assembly.
- Project integration – Suitable for projects such as Power Supply Monitor, Water Tank Controller, Classroom Demonstrator, and other designs where the following function is useful: Adjustable high/low voltage alarm that monitors an input and sounds an alarm when the signal moves outside the selected range
More information
Notes
- Electrical specifications are nominal and may vary with component tolerances, supply voltage, load and operating conditions.
- The product is supplied in kit form and requires soldering and assembly before use.
- Check component values and observe the polarity or orientation of ICs, diodes, LEDs, transistors and electrolytic capacitors before applying power.