Category: Radio

Gentleman Jim

I am in the process of building one of my electronic gizmos.

For this particular project, I need a transistor. But not just any old transistor… I’ve got plenty of those.  No, for this I needed a ZXTP2012ASTZ.

Yes, a ZXTP2012ASTZ.

As I’m sure you have realised, this transistor is a little bit out of the ordinary and, as such, none of my normal suppliers stocked it.

I eventually found it on Mouser. They’re a major supplier of electronic components, but I’ve never used them before.

I added the transistor to My Basket and clicked Checkout.

Mouser presented me with a price for my purchase: 59p.

Fifty-nine pence. That’s alright. But then they added another £12.00 for postage!

How the hell can something of that size warrant 12 quid postage?

For those of you not sure how big a transistor is, that it should justify 12 quid postage, I have included a picture… with a 5p coin for scale.

Turns out, Mouser have a standard 12 quid P&P added to any order under 33 pounds.

No matter what it is.


Obviously, I didn’t buy it.

But then, I mentioned this to a chap I talk to regularly on the radio.  Jim said that he often ordered stuff from Mouser and would be happy to add my transistor to his next order. What a top fellow!

I received an email from him yesterday, telling me it had arrived.

As he only lives ten miles from me, I took a drive over and we had a good ol’ chat over a cup of tea and a biscuit.

It was good to finally put a face to the voice I’ve spoken to, so many times over the past couple of years.

And he never even charged me for the transistor.

I Was First!

In readiness for the Christmas Quiz – which we have every year at the big family get-together – I wanted some Quiz Buzzers, to stop the arguments over who shouted first.

The ones I used last year – which I built many years ago, from a circuit in one of the electronics magazines – worked well, but there were too many wires spread across the tables and chairs,  between the push buttons and the control unit.  A Health & Safety nightmare!

And so this year, I looked around for a wireless version. They are bloody expensive to buy (300 quid and up, from what I could see), so a homebrew version would have to be the order of the day.

After a bit of searching on the internets, I found a wonderfully simple Arduino design from a German chap called Felix. I say ‘simple’ but of course, all the cleverness is in the software. 

His design only allowed for two buttons though and I wanted four.  I thought that I would be able to figure out how to add more, from his code, but my coding skills are rubbish and I couldn’t make head nor tail of it… it might as well have been in Greek!  So, I dropped him a line asking if he would be so kind as to amend his code to allow for more buzzers. 24 hours later, he’d done so. Splendid fellow!

I then added a little bit of simple code of my own, to allow the Master control unit to give an audio alert when any button had been pressed, as I found in testing that it was quite easy for a player to lock the other players out, by pressing his button and then just keeping it covered with his hand, so no-one could see (Harry, you little cheat!).

I won’t go into the circuit here, or the code, as that can all be downloaded from Felix’s GitHub Repository.  But, if you plan on building one, I’m happy to supply my extra bit of code for the audio alert – which I feel is a definite requirement.

The Arduino Nano boards were sourced from ebay, along with the NRF24L01 radio modules for a very reasonable price. The big buttons are 60mm ones from Arcade World and are very good quality. The Tupperware came from Sainsbury’s.  🙂

I’m pleased to say it all works wonderfully.

I just need to put a quiz together now!

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