Loud Beeper LM386 Stripboard Veroboard Layout

My gran is ill and is staying with me so I wanted to make a little but loud alert beeper in case she's not well in the night and needs to get my attention.
I just roughly followed the schematic from the LM386 datasheet HERE for the squarewave oscillator

I used a little laptop speaker and it works very well. remember - the bigger the speaker - the louder it will be.

Atari Punk Console Stripboard Veroboard Layout

Another quick one. A favorite among beginners - originally by Forrest Mims
I got an email this morning asking to check over a layout he'd found and also how to add a volume pot so I just did a new layout, built it and made some stupid noises for half an hour and now I'm posting it here.
this is obviously the version that is adapted to use 2 single 555 timers rather than 1 dual 556 timer but it's the same. 

have fun.

 

Devils Drone Sequencer Veroboard Stripboard Layout

This has taken some time to design and it's not perfect but it sounds pretty cool (As you can hear from the sample) it follows on from the devils triangle I did earlier this year ( Found HERE and no you don't have to build that to make this work!)
This is quite a big project and as you can hear I have built it using the stripboard layout provided (as I do with all my layouts) so take your time because I really can't spend lots of time answering why things don't work. The truth is that unless you have the board in front of you there is no possible way to troubleshoot things. But if you take it slowly it should be good.
also don't forget to check out the "tips and troubleshooting" page above

I would also recommend not to do this if you're in-experienced

Devils Triangle Drone Synth Stripboard Veroboard Layout

this is a project based largely on the put up or shut up mentality, for quite some time I've been getting annoyed at seeing youtube videos of people pissing about with these "synths" which are basically boxes of 555 timers with a million knobs that make stupid noises that you couldn't ever actually use in music so I thought I would make my own little synth that would get repeatable sounds and be useful in music and what better type of synth? a droner type - basically cause I love bagpipes - I like drones
anyway the circuit itself is quite a simple one basically because I only designed it during the week, all it is really is 3 triangle wave generators configured to operate in the audio range going into a mixer op-amp configuration with the odd filter here and there to soften the waveforms
I've used LM358 op-amps cause they are the cheapest, I'm not too sure if others would work in the same way though they probably will.

why call it the devils triangle - well it has 3 oscillators one of which can oscillate a slightly high pitch range (for melody) it also sounds demonic so the name fit

Hope you enjoy

EDIT: I replaced the level knobs with on/off switches - it makes it so much more versatile being able to silent certain drones 
EDIT: I added a little schematic on how the switches should be wired as it was causing a bit of confusion.

the one I made - with a really shit paint job

White Noise Generator Stripboard Veroboard Layout

This is a very basic circuit which consists of 2 parts
1st is the noise generator which is the first transistor with no collector connection
2nd is the bit which may look more familiar which is an AC common-emitter amplifier and this is just to bring the noise upto a usable level - I have taken a scope screenshot of what the noise looks like however it is an audible sound which is pretty useful for testing guitar fx or filters and other such things.

if you wish to learn more about the common-emitter amplifier the best source for information is "The Art Of Electronics" book - on page 77 almost the exact same amplifier circuit appears with explanation 

you can of course experiment with different types of transistor in the noise section - i'm not sure how available the BC108s are now, I just happened to have a load of old ones, I hit it with a hammer to get a bit more noise out of it.

the best voltage I've found to use this at is 18volts however it does make noise at 9volts upwards

Door Bell Beeper StripBoard Veroboard Layout

Another circuit born from necessity, the story goes like this, the door bell I have is a wireless thing that needs it's battery changing every 2 minutes - it constantly draws 600uA in standby and jumps up to 80mA when the bell is pressed and then there is the transmitter which I haven't bothered measuring.
so because during this week the batteries went flat I missed the post twice, I assumed that the first time it was just because I was playing music too loud and didn't hear the bell but the second day this was not the case so I figured time to make my own with the following specs - less standby power use and loud as fuck.

anyway what happens in the circuit is that pressing the switch discharges the capacitor into the IC which allows it to carry on beeping untill the capacitor drops below a certain voltage I won't go into detail about the fucntionality of a Logic NAND gate because there is a brilliant site that covers it in a simple manner HERE

however I have taken a screen capture of my scope to show you the voltage waveform as it discharges into the circuit. you'll notice at first the waveform has bumpy bits, that's the actual beeper circuit powering the speaker and as you can see the beeping lasts for about 1.5 seconds which is long enough when you hear this thing.
it draws about 150uA in standby and about 30mA when it's making a sound so it beats the stupid piece of crap I currently have.

sorry for the lack of real explanation on this circuit but I've got a bastard of a migraine 

Simple Sweep Generator Stripboard Layout

A very simple Sweep Generator - it goes through the audible (and beyond) range which is useful for Impulse Response recording and other stuff of course.
it also kind of sounds like one of those woop sirens from sci fi films