LMNC Super Simple VCO [Strip Board Layout + BOM]

Layout credit: LMNC (Sam Battle)

As requested by @PekTeragon

Transcription of instructions:

  • Always cut center pin of transistor

Layout:

LMNC Videos on the matter:

The simplest DIY audio oscillator? not a 555 chip. reverse avalanche

The simplest DIY Oscillator? Synth Project PART 2

Bill of Materials:

SMALL STRIPBOARD 93X55MM (COPPER)

https://www.taydaelectronics.com/small-stripboard-93x55mm-copper.html
$0.66 / £0.50
Quantity: 1

1K OHM 1/4W 1% METAL FILM RESISTOR ROYAL OHM TOP QUALITY

https://www.taydaelectronics.com/10-x-resistor-100k-ohm-1-4w-1-metal-film-pkg-of-10.html
$0.012 / £0.0092
Quantity: 1

100K OHM 1/4W 1% METAL FILM RESISTOR ROYAL OHM TOP QUALITY

https://www.taydaelectronics.com/10-x-resistor-100k-ohm-1-4w-1-metal-film-pkg-of-10.html
$0.012 / £0.0092
Quantity: 1

6.35MM 1/4" STEREO PHONE JACK

https://www.taydaelectronics.com/6-35mm-1-4-stereo-phone-jack.html
$0.45 / £0.35
Quantity: 1

100K OHM LINEAR TAPER POTENTIOMETER SOLDER LUGS ROUND SHAFT DIA: 6.35MM

$0.50 / £0.38
Quantity: 1

10K OHM LINEAR TAPER POTENTIOMETER SOLDER LUGS ROUND SHAFT DIA: 6.35MM

$0.50 / £0.38
Quantity: 1

10UF 25V 105C RADIAL ELECTROLYTIC CAPACITOR 5X11MM

$0.02 / £0.015
Quantity: 1

0.047uF 50V Ceramic Disc Capacitor

$0.06 / £0.043
Quantity: 1

2N3904 NPN GENERAL PURPOSE TRANSISTOR

$0.02 / £0.015
Quantity: 1

LED 5MM RED

https://www.taydaelectronics.com/leds/round-leds/5mm-leds/led-5mm-red.html
$0.03 / £0.023
Quantity: 1

AWG 22 BLACK HOOK-UP WIRE 1FT (30CM) SOLID

$0.10 / £0.076
Quantity: 5

AWG 22 BLUE HOOK-UP WIRE 1FT (30CM) SOLID

$0.10 / £0.076
Quantity: 5

AWG 22 RED HOOK-UP WIRE 1FT (30CM) SOLID

$0.10 / £0.076
Quantity: 5

Total cost of components:

$3.80 / £2.94

I recommend getting more components than is listed here in case of mistakes or the occasional bad component. Its cheap anyways so fund future endeavors and save yourself some agony. To my knowledge Sam didn’t cover how to hook this up to an audio jack. You should just have to hook up the wire labeled “GND” to the ground of the jack socket, and the wire labeled “out” to the other. Easy Peasy Lemon Squeezy.

I also recommend pairing this with the super simple mixer if you plan on making a few of these. Sam has a great stripboard layout for that as well. To see the BOM for that, make your way over here:

8 Likes

Caustic is the MAN!!! <3 :slight_smile:

^ just had to throw that out there. lol

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Thank you so much Caustic this is so helpful! Do you have any recomendations for any European store where I can buy all this stuff. I’m having trouble finding a non-uK store and I can’t order from the UK because the shipping is very expensive.

Tayda ships everywhere.

The big ones have portuguese storefronts (pt.mouser.com, digikey.pt, etc), even if you usually have to order for EUR 50 or so to get free shipping.

I’m sure there are local suppliers too, but unless any fellow portuguese tinkerer sees this you probably have to ask around in local forums to find them.

2 Likes

Ok thank you I’ll check it out. We have some stores who sell some parts but they don’t have everything.

So I used your list and tried to select the same parts on european websites so I got this:

https://www.digikey.pt/product-detail/en/vector-electronics/169P44C1/V1003-ND/1876

https://www.digikey.pt/product-detail/en/stackpole-electronics-inc/CF14JT100K/CF14JT100KCT-ND/1830399

https://www.digikey.pt/product-detail/en/stackpole-electronics-inc/CF14JT1K00/CF14JT1K00CT-ND/1830350

https://www.digikey.pt/product-detail/en/switchcraft-inc/112AX/SC1316-ND/1217815

https://www.digikey.pt/product-detail/en/bourns-inc/PDA241-SRT02-104A2/PDA241-SRT02-104A2-ND/3781557

https://www.digikey.pt/product-detail/en/nichicon/USR1E100MDD1TE/493-17428-1-ND/8582420

https://mauser.pt/catalog/product_info.php?cPath=324_278_739&products_id=017-0210

https://mauser.pt/catalog/product_info.php?cPath=324_1001_846&products_id=010-0602

Did I get it right?

I’ll check when I get home. Any reason tayda is an unappealing option?

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Because I’m afraid it might get stuck in costums. The only things I ordered from outside the EU got stuck there for more than a month and I had to pay a fee to get them out. But Tayda is an extremely appealing option because you have everything in one place.

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I’ve been hearing nightmares about customs for y’all over there. Not knowing too much about it, can you tell me if that’s exclusive to outside Europe, or just outside any given country? I want to assist in shopping if tayda isn’t an option.

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Yes it’s exclusive from outside Europe. Last time I bought an Antumbra Smog from an American company it got stuck in costums for more than a month and I had to pay an extra 50€. I ordered my Sony MDR 7506 from a chinese company and had the same issue. And they don’t even call you saying they have the product they wait for you to call and most times we don’t even get a notification saying the product is being held in costums.

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Thanks for clarifying, is it known if this is temporary? Either way, I should try and update the cheap components list and BOMs to accommodate this.

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I can confirm that ordering outside the EU is a pain in the ass in the UK. I ordered a t-shirt from the states that cost $20 and ended up paying the same again in fees and a third time for shipping (although that’s not customs fault). As far as China goes it’s a lottery as sometimes they ship via mainland eu and our customs ignores it. Mind you, local politics may well change the situation by next year, for better or worse.

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No. I think it will always be like this. And now with Brexit even buying from the UK is the same problem. Thank you for what you are doing.

Yes exaxtly. And with Brexit same thing aplies when buying things from the UK.

Yeah, I am one of the moaning lefties who didn’t want it, so I am just as peeved as you are.

But it is what it is, and let’s leave it at that :wink:

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Exactly there has been too much discussion on the subject :grinning:

No matter how ppl feel about it, I think everyone can agree avoiding being taken for a ride is in our best interest. Ill do some research tonight and see what i can turn up.

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It is. Thank you I’ll keep doing my research too.

I found an interesting store in Portugal which has most of the components if you guys want to check:

https://www.electrofun.pt/

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Not being funny, and no disrespect intended, but this just doesn’t work properly, you need to update the layout really to stop people spending hours getting frustrated.
Tone section is laid out all wrong, works better with a 104 cap aswell.
LED should go between row K and L surely?
Also, the oscillator doesn’t cut out at the top of the range if you put the cap between row I and K
And you can get much more tuning range of you use a 20k pot.

This isn’t the first time I’ve found major flaws with these layouts, I sometimes think Sam is just trolling.
Dunno why anyone would be a patron for misinformation, but yeah all good, but this is only after I’ve basically made my own layout.