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Welcome. I wanted to provide stripboard layouts I've made to help people new to electronics and even the more experienced get into different aspects of electronics.

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Thursday, 20 September 2012

Fading LEDs / Eyes for Halloween decorations stripboard veroboard layout

The inspiration for this little circuit with Halloween approaching was a post I saw made on this Thrifty Crafty Girl
basically the girl had an idea of putting glow sticks in toilet rolls with eyes cut out to leave in bushes however I thought it would be cool to add an electronic element to it.
so I made a little circuit that will make LEDs fade in and out - they will go in and out of sync and will look pretty dam creepy
Anyway this one quite cheap to make circuit will "power" 4 toilet roll monsters - 2 LEDs per toilet roll or whatever you want to put "eyes" or LEDs in
below is a video of it in action

Paul in the
Lab is here to help
Everyone that's into electronics
Always feel free to
Seek my advice
Either using the
Contact button or my email
Lately I am always at the computer because
I am  designing stuff for the site though I did buy a new
Camera recently it's pretty cool. I remember the first thing I built was the
Knight rider LED scanner which I uploaded
To the site a few days ago, remember if you need to know
How to do something
Even if you think it's
Abit of a stupid question just ask, I
Don't mind. We all had to
Start somewhere. 


  1. I do not have the foggiest clue how you've done what you've done, but my 4-H Line & Design kids (4th - 12th grade) are going to love you! Do you mind if I direct them to your website?

  2. of course you can, I'd love to see pictures of any of their creations using this (or any of the others) circuit!

  3. So, here it goes Mr. Stevenson, sir. I really admire what you're doing here - you've got a lot of great projects and have obviously been doing this a long time. I'm probably going to be bothering you quite a bit now, so I might as just tell you where I sit and why I'm interested in electronics in the first place.

    My experience began earlier this year when I built an ampeg scrambler octave fuzz from a schematic. My goal was to later work up to building amplifiers. I now salvage a lot of parts and spend most of my time reading their data sheets and see what I can make. I have since built a six volt power amp, a nine volt power amp with preamp, and an oscillator from the data sheets and learned about the basic functions of things such as diodes and FETs and op amps.... Ohms law and ac rectification and other such commonplaces of the electrical world.

    My interest is still to build amps. Particularly high watt solid state amps. I have come to understand that amps have three basic sections (please correct me at any place where I am wrong), a power supply, Pre amp, and power amp. Now I think I can get to the point. I have spent most of my time researching the power amp (I'm drifting toward a bridged amplifier) since the power supply seems fairly simple and preamps essentially perform those functions which I have learned about by building effects pedals. I still don't understand the power amp. I see guts of high watt power amps which have what appears to be rows of stages mounted to a continuous heat sink, but the data sheets I read don't tell me anything about how such a thing would work. I looked up multi stage amplifiers and I read about two stage amplifiers, followers and such, but it didn't go any further.

    I guess what I'm asking for help with generally is how to build amplifiers, and my mind is open to understanding unlimited ways. What really attracted me to your page before I got onto all your other neat projects was the tonesucker. I have been looking for a long time and you're the first and only I have found who has offers a DIY to a 24v power amp. Well, I take that back, I have found many tube instructables, but they tend to be unclear.

    1. contact me via my email address fixedfrequencies@hotmail.co.uk and let me know exactly what you're having problems with.
      when you look inside a high power transistor amp - the rows of power transistors are often in what's known as a push/pull configuration so you'll have one side of NPN transistors and one side of PNP transistors.
      now what you can do is take out all of those power transistors leaving just one PNP and one NPN and you would get a lower output amp. this is because all these transistors are in parallel with each other - the collector of each transistor will usually have a very low ohm high watt current limiting resistor so they share the load equally.

      anyway email me about it.
      did you build the tonesucker? because you can change the TDA2030 to a TDA2050 and get 32 watts out of it (you need a bigger heatsink and about a 1.3Amp power supply though)32 watts is very loud when you're plugging it into a 2x12" cab

  4. I hope that isn't overwhelming.