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.
If you want to implement on/off switches for each oscillator, replace these jumpers with on/off switches.
the IC is 358 or 386 ?
ReplyDeleteIt's the 358. Not sure how I messed that up. Thanks for catching that.
DeleteReally digging these synth layouts on the site, I wanted to build this for while. Cheers!
ReplyDeleteAs only leave with 1 general volume?
ReplyDeleteNot working !:( I used Texas Instruments LM358P
ReplyDeleteHi! Great layouts!!
ReplyDeleteVerified!
I've made some changes:
- According to the schematic, i changed the 220K that goes from "IC3 pin 6" to "Pinch C 3" with a 100K
- From "Pinch C 1 " Add a 100K in series with a 47n to ground.
This will just shift the third osc range up, leave as it is and you will have 3 equal oscillators!
I've also made some variations in the mixing stage to completely mute a single oscillator with the "Level" all the way down.
Thanks for verifying and for sharing your mods!
DeleteHello! Thanks for sharing your designs...I'm currenttly working on this building. I have a question for you. Do you know if it is possible to add a CV input to this circuit, to run it with a sequencer or something like that?? Thanks!
ReplyDeleteHey ALG! You could be interested in what was the continuation from Paulinthelab of this project, the Devil Triangle Sequencer:
Deletehttps://web.archive.org/web/20150928141310/http://www.paulinthelab.com/2013/09/devils-drone-sequencer-veroboard.html
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ReplyDeleteI'm too working on this synth, I'm waiting for my Schottky diode. Could someone explain me precisely what is its use?
ReplyDeleteMy attempt failed, two of the three voices are at super-low volume. What could it be?
ReplyDeletei have some problem with switches and with volume did someone else verify this synth?
ReplyDeletei did it with switches instead of volume pots for each chanel. the question is, i guess i have to place a jumper between what it would be leg 3 and 2 of the level pot? or a resistor??
ReplyDeleteLug 3 of each level pot isn't connected, so the jumpers would need to go from lugs 1 to 2.
Deletecant find transfer image
ReplyDeletecan anyone help?
Check the Synths folder
DeleteHa thanks
ReplyDeletepretty obvious
Love the builds on here
thanks for all your work
Hey, I got this sucker working, although I think the pot positions on the drilling template need to be reversed to match how you have them to he soldered. What's down should be up and what's up should be down... or am I way out to lunch?
ReplyDeleteYou're right. No idea what i was thinking. lol Fixed now
DeleteHi!
ReplyDeleteBuilt this project - first two oscillators works great but third don't work - it producing only very loud noise. Can anybody help me to solve this problem?
And volume pots doesn't mute the signal in full range of pot - only little less loud.
see my latest comment.
DeleteHow to put leds on each oscilator?
ReplyDeleteI found a mistake in the layout. The switch for the 3th oscilator is placed badly. In this position it also disconects the 100k resistor from the pin 2 on the output IC.
ReplyDeleteAlso if you want to use volume pots then I recommend to use 1Mohms - lug 1 to gnd, lug2 from 100k and lug3 to the output IC.
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DeleteIs 5817 necessary?
ReplyDeleteYou can use a 4001 or similar
DeleteThanks! So for bypassing individual volume knob I can jump the two active pot pins and the main volume has to be in between out on pcb and the actual jack socket?
DeleteI think that sounds right
DeleteNope I’m confused ahah where should I put main volume pot?
DeleteNot working. Components seem fine to multimeter testing, jumpers to lugs 1 and 2 of level pots and no general volume pot and switches in right places
DeleteHey guys, I have experience with building guitar effects but I'm a newbie when it comes to building synths. My question is, what are the recommended values for the pitch potentiometers? Thanks!
ReplyDeleteAnyone knows How to wire the jumpers and a led for each oscilator on a dpdt switch?
ReplyDelete