Mindsets Alarm Clock Solder Kit

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Quoting product code: N21FL


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About this product


  • Build your own digital clock with alarm
  • Built-in buzzer and four digit clock display
  • Simple and fun to build with 30 parts

Product overview

• Build your own digital clock with alarm
• Built-in buzzer and four digit clock display
• Simple and fun to build with 30 parts
• Requires a 9-18V power supply (not included)

What can I do with this kit?
Make your own 24-hour digital alarm clock with this kit. Three buttons allow you to set the time, set your alarm and then silence it when it goes off. You can also create a separate slider switch to turn the alarm on and off. With an 82mm x 54mm board you can fit this circuit inside almost anything, so you can build a clock body around it and create a fully working clock. This 30 part kit can be soldered by anyone from beginners to experts.

What can I learn with this kit?
See how digital clocks work and get a closer look at their inner workings. Get experience in how to solder a variety of components – from switches and resistors to microchips and displays. The three different switches in this kit send signals to the 1N006 microchip, which controls the display and buzzer outputs. This kit requires a soldering iron and solder and may require wire cutters.

How easy is this kit to solder?
This is a great kit for beginners to learn to solder and contains a wide range of a basic components and temperature-sensitive chips. Once you’ve created your alarm you could add to your creations with an enclosure or clock body around the kit. This kit requires a 9-18V power supply (not included) with a 2.1mm centre positive jack.

Rated 2 out of 5 by from Disappointing I was about to post a glowing review of this kit, having enjoyed the build and seeing it work immediately upon completion two days ago. Just moments before beginning this review I powered it up and straight away it booted-up into alarm set mode and just continually cycles rapidly through the hours and minutes. I checked the switches and they are all fine. The soldered joints are all good. I had hoped it would last a lot longer than two days and I did plan on buying a case for it and actually using it as a desk clock. But alas, it's kaput and no use for anything. Would such an item be eligible for a refund? £20 is a bit much just to throw away.
Date published: 2016-04-08
Rated 4 out of 5 by from This is a nice easy build, functional and good value. A nice project to run young children through - although no schematic is provided, there is little confusion possible. However the voltage regulator layout was designed by someone with no knowledge of analogue electronics. The use of a small-value ceramic cap for C4 makes the 7805 voltage reg oscillate and run very hot, drawing excess current. The easy fix is to swap the parts used for C3 and C4. Or, if you have some spare caps to hand, you can replace C4 with any electrolytic cap of 1uf or more. Either way you must watch the polarity of the electrolytic cap - it must be installed with the ' - ' marking connected to the 0v side of the incoming supply.
Date published: 2014-11-11
Rated 4 out of 5 by from Great for Grandchildren. This is the second alarm clock kit I have purchased for 2 of my 7 year old grandchildren. I gave them a brief "How to solder lesson" and helped them identify components, and they were away. They needed a little supervision. e.g. with bending the legs on a resistor and placing the components in the right place. The first clock has been running for 2 years and the second unit only a few hours. Both worked straight away. I helped them to put the kit into small project boxes, with clear perspex lids. Both run off 9 volt plug transformers. A very good project for young minds. It is a pity there is no education notes on how it works.
Date published: 2015-04-11
Rated 4 out of 5 by from This is a great little kit and works very well. The assembled clock is easy to use and accurate. The kit includes all components but no case or power supply. It includes a generic set of guidelines for building kits and a brief set of specific instructions. A reasonable level of soldering and the basics of component identification is required, so this probably isnФЗЦt suitable for an absolute beginner ФЗф or at least not without some help. ItФЗЦs a shame that a basic circuit description and diagram is not included. To me this is an essential part of the learning process, and as an educational kit this should be included. This is the reason IФЗЦve rated this 4 stars and not 5. We found the display very bright over night, so I suggest increasing the size of resistors R1 to R8 (try 470?). It is worth putting a piece of green filter or acetate over the display as it improves the contrast and makes it easier to read.
Date published: 2014-11-11
Rated 5 out of 5 by from This kit is easy to build, and works exactly as promised. The crystal oscillator started (as they all do) without any problem (if you can solder the parts in the right place). It doesn't (as another reviewer suggests) depend on PCB traces to start. It relies on the gain of the logic gates inside the main chip and the crystal's resonance. The clock does suck power like a fury and the regulator does get hot if you try to power it from anything other than about 9V (and not less than 8V). Don't try to run it long term from a battery. Use a good quality 9V plug-pack.
Date published: 2014-11-11
Rated 2 out of 5 by from Clock works at last Not a difficult build but you'll need a fine bit soldering iron. My first attempt wouldn't work because the crystal failed to oscillate (which seems to be a common problem) so I got a second kit and built it a little less neatly. The two caps that strap the xtal to ground were assembled with one snug to the board and the other quite high off the board with the legs untrimmed. This degree of asymmetry seemed to do the trick and it worked first time.
Date published: 2015-01-03
Rated 2 out of 5 by from It was fun to put together but it didn't work when it as done, no lights on the display light up. I am disappointed with it. :(
Date published: 2014-11-11
Rated 2 out of 5 by from Im no electronics expert but this kit sucks power like there is no tomorrow. It will drain a PP9 in 24 hours and, if run of from a mains supply, the voltage regulator runs hot. This is a badly designed kit. I cannot recommend it.
Date published: 2014-11-11
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What color is the 7 segment display? Also, what does the green LED mean?

Asked by: Penguin_k
The 7 segment LED is green The small LED on the kit next to the transistor lights up red when you slide the alarm switch into the ON position to indicate the alarm is SET
Answered by: Russell
Date published: 2017-09-29

Can I run this off a 9 volt battery? If so, how long will it last for before it needs to be changed?

Asked by: Penguin_k
The unit is designed to run from a 9-18v power supply.
Answered by: Les
Date published: 2017-09-24

If I set a time for the alarm then take the batteries out, will it remember the time? Will I have to set the time and the alarm clock time again?

Asked by: Penguin_k
This would have to be reset.
Answered by: darren cordon
Date published: 2017-09-18

What are the dimensions of the digital clock display?

Asked by: dclemson99
The dimensions of the display are (mm) 50 x 19 x 4 with 5mm solder pins on the bottom.
Answered by: Gareth
Date published: 2016-03-04

Is the code available for the chip because the power regulator failed in my model and has fried the chip

Asked by: Anon
If the item is still under warranty this can be taken into store and exchanged, or if not it can still be taken in store and we can try to identify the part required.
Answered by: Darren
Date published: 2016-02-26

Where can I get a circuit diagram?

Asked by: Krantz
assembly instructions for the kit as well as a circuit diagram can be found here https://maplindownloads.s3-eu-west-1.amazonaws.com/n21fl-6182.pdf
Answered by: Les
Date published: 2016-01-09

I get that it requires between 9 and 18 V but what ampage does the alarm clock require (for the power supply)

Asked by: David
Approximately 500mA.
Answered by: Dominic
Date published: 2015-10-01

Does this product display the alarm time or clock time?

Asked by: Boss
This clock displays the clock time.
Answered by: Billy
Date published: 2015-08-10
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