Poor Mans Audio Signal Generator Stripboard Veroboard Layout

this is something I made in school 15 odd years ago. you had to take a square wave, use a passive filter network to convert the signal to triangle and sine - this also has square and integrator waveforms. it's quite good up to 1 KHz but after that it starts to clip and go funny but it's more than adequate as an extremely cheap audio signal generator using 2 transistors and 1 LM555 timer IC - if you've gone through alot of my projects you'll notice how useful this IC is by now.

I have done another signal generator project that uses a proprietary ICL8038 IC Project can be found HERE which is more fully featured as far as project function generators go but the IC can be costly in certain places where as you can go on the grey market (IE eBay china sellers) and pick up hundreds of them for next to nothing.

Adjustable Mains Hum Notch Filter Stripboard Veroboard Layout

I built this for those of you who have guitars with single coil pickups or indeed anything that picks up mains interference up (that annoying set of speakers in my bed room for example) anyway this little device reduces the mains hum by several orders of magnitude

it is adjustable between 45Hz and 90Hz so just put it before your amp or whatever and adjust the trim pot till the hum goes away.

it uses the same Texas Instruments TLC071 OP-AMP as I used in the last project for pretty much the same reason

Temperature Controlled Fan Controller Stripboard Veroboard Layout

I built this for 2 things - 1. my computer is getting a little hot and I like quiet for as much as is possible so having a little automatic controller turning on a few fans when it gets too hot is ideal for me. and 2. my homemade power supplies could do with fans and again I don't want them running all the time but with this particular temperature sensor LM35DT as it is a TO-220 package you can screw it to the heatsink you have your regulators on (with the usual isolation of course) so the fan only runs when the regulator gets abit hot.

(v)R3 controls at which heat the fan will turn on at however it is a little tricky to calibrate so it will be a case of trial and error unless you have known heat sources.

I also used a TLC071 OP-AMP for a couple of reasons 1st. it is a single supply op-amp so I didn't have to piss about with dual supplies etc. and 2nd I got it free from Texas Instruments excellent sample service

I used a TIP41A because that's what was nearest to my hand. I know the schematic says TIP41C but it doesn't really matter - the letter designations just refer to the voltage the transistor can handle and none of them go below 40 volts so use whichever you can get or even any similar NPN power transistor will be fine.

Simple LED Flasher Stripboard Veroboard Layout

I've done LED flasher type circuits before on here but usually they were for something someone wanted so they did specific things like fade in and out and so on.

So I thought for a little 10 minute project I would do one of the very first projects I ever made as a little boy. I was very proud when I made my first LED flash. it's not like now where people just load up the "blink" sketch in Arduino. this is a proper old school relaxation oscillator.
my original one had a few more components but I've managed to whittle this down to 3 resistors, 2 transistors and a capacitor + an LED obviously.

this particular circuit is known as a relaxation oscillator and there's lots of theory and stuff behind that but in extremely simple terms: it charges a capacitor until something "disturbs" it. in this case the "disturbance" is the threshold voltage of Q2 (the voltage at which the Base conducts) this quickly discharges the capacitor which results in a short blink.
which looks nicer than the conventional square wave oscillator which the LED stays on the same length of time as it is off

everyone loves a flashing LED

if you get this reference then you're ace.

Adjustable Lab Power Supply With Current Limiting ( L200C ) Stripboard Veroboard Layout

it's been a while since I've done a new layout - I've been and continue to be ill but I thought I would try and do something so people don't give up coming here. so with a body full of painkillers etc. I designed this little power supply.
it differs to my previous power supplies in that it is an extended range one. IE it goes from 0 volts upwards rather than 1.2volts upwards.
the way this is done if by creating a negative reference voltage and feeding it into the L200C regulator.

this also has current limiting so you can set it to drop out if a circuit tries to draw more current than it should (due to short circuits etc.) which can avoid circuit catastrophes.

anyway here you go.

Soft Latch True Bypass (Relay) Switch For Guitar Effects Stripboard veroboard Layout

People often like to retrofit their guitar effects with "true bypass" switches but this usually means wrecking the pedal case by drilling holes in it and stripping out the buffered section etc.

Personally I don't like doing this modification, I like there to be a buffer because there is always a degree of signal loss in pedal chains but this is here for those who do like to do it.

as it uses a mechanical relay (which can be found at Rapid Electronics or wherever - the one I used is the 12v version of this one ) it is exactly the same as a true bypass switch and adds nothing to the signal.
it is quite small so it can fit in some pedals (like a tubescreamer) or you could use it externally to maybe bypass a whole group of pedals (or just one of course)

it's worth mentioning that this has many other uses such as controlling high power relays with a little tact/push switch and so on

NB: if you find you're getting misfire clicks you can make the capacitor a higher value - that part acts as a crude debounce - the higher it is the more stable it becomes but the slower you can turn it on and off but I found 220n was fine for guitar bypassing

hope you like.

for the purpose of perspective

Nintendetar Guitar Fuzz Stripboard Veroboard Layout

This is something I made a long long time ago and subsequently made actual PCBs for which I still have but due to the fact my agoraphobia has reached such levels I can't post them anymore so I don't bother selling them. however it's a cool effect so I made a stripboard for it. I also Made an Add-on board a while back located HERE

or with the Oscillator Add On..

Greg Fryer Brian May Treble Booster Deluxe Schematic Stripboard Veroboard Layout

this is one of the best treble boosters I've built and I've built alot of them being a Brian May fan.
this was traced from the circuit board and I have made 2 changes (that don't affect the sound)

1. in the original there are 2 power supply capacitors (47uf and 33uf) in parallel which was obviously used to keep production costs down - Greg will have initially put in the standard 100 uf capacitor but if his other pedals/products used 33uf and 47uf caps - it would have been cheaper to just parallel a couple of those up to get near enough.

2. the other change is that there are 2 10pf capacitors in series again this will be a production cost thing - it would be cheaper to use 2 10pf capacitors in series than adding 1 4.7pf cap to the build (if he used a lot of 10pf capacitors in other builds which he most probably will do.)

so with those changes noted: it sounds no different to the original unit but you can always swap them if you don't believe me.

Sparky 5 Watt Amplifier Stripboard Veroboard Layout

I thought it was about time to tackle something that's been on my todo list for a while and that is to make a follow up to the infamous Ruby amp (made by Runoffgroove.com) which is a popular circuit among the DIY community.

So I thought the best idea was to use an amplifier IC in the same family as the Ruby's amp IC which after an extensive 5 minute search on Texas Instruments website lead me to the LM384 (DATASHEET) which is a 5 watt mono audio amplifier.
it needs a minimum of 12 volts to run though I would run it at 15 volts

All the way up it goes into crazy distortion but before that it is a really nice sounding amp, you get a nice clean and then the louder it goes the more it clips - but nicely - I must do some sound clips!

it powers a 1 x 12" cab very nicely - I've not tried it with a 2 x 12" cab yet but I think it will be fine.

so I introduce to you the SPARKY Amplifier - why did I call it the "SPARKY"? fuck knows, I think it was cause I was watching that cartoon where the piano comes to life.

Yamaha NE-1 Bass Parametric EQ Preamp ( Nathan East ) Stripboard Veroboard Layout

I'm not feeling too well so I won't drone on about this + I'm going to watch Michael Mosley documentaries for a bit.
My friend has been asking me to do a layout for the Nathan East Bass Preamp since his got stolen at a gig some years ago so I finally got around to doing it - I had to reverse engineer from pictures on the internet and it has been somewhat a pain in the ass however it now works and sounds how it should.

I didn't have the required TL062 op-amp to hand so I used the TL082 (DATASHEET) in this application there will be little to no difference to the sound - the sound is altered in the components around the amplifier.

one thing I should mention is that some people mod it by changing C4 from 47p to 220p ( I think so they can use it with their guitars. Anyway - enjoy.

EDIT: I bought another one of these preamps and C4 was 100pf in that one - so it seems that they either changed it at some point or just use something other than the normal 1% tolerance capacitors you'd usually get in this type of thing