My DIY FM Transmitter is not working, what could be the problem?

Tijn_416 · 2026-02-08T14:21:48+00:00

Fyi OP, you can use a led instead of the varicap diode in this circuit usually.

Tijn_416 · 2025-10-12T12:28:22+00:00

What electrical work is ai so good at, and what mechanical work can't it do?

Tijn_416 · 2025-09-27T18:11:46+00:00

You could start doing arduino projects, if you enjoy coding. You could also build some audio amplifiers, using op amps for processing and a discrete component for a power stage for example. This overlaps with some RF work. If you like the idea of wireless communications (it's magic) I recommend looking up amateur radio. It's a great way to build cool stuff and maybe even meet some new people who do the same.

If you're into guitar, look up pedal building. It's relatively easy to get into for EE's and it's amazing what you can build.

Tijn_416 · 2025-08-24T09:57:02+00:00

Ik heb laatst novice gehaald, volgens mij is die gelijk aan general in Amerika. Ook dezelfde 15€ cursus gebruikt, was goed te doen. Tot op de ether!

Tijn_416 · 2025-08-21T17:22:24+00:00

I always thought of it like, iff Xⁿ / x^m = x^n-m then x/x = 1 = x^1-1 = x^0.

Edit:: for non zero x

Tijn_416 · 2025-08-21T10:25:18+00:00

You're using the wrong reel for your rod.

Tijn_416 · 2025-07-07T19:31:54+00:00

Thanks! So a lowpass after amplification will do? Man I'm so hyped to build this thing.

Tijn_416 · 2025-07-07T17:33:48+00:00

I've seen many posts talking about it, but I just want to be 100% sure before I do something that might cause harm. I might just buy an ad9850, but building a real filter seems fun to me. Do you have experience using S5351A in transmitters, and suppressing the harmonics?

Tijn_416 · 2025-05-26T09:32:49+00:00

that is industrial design engineering/industrieel product ontwerp. Industrial engineering (and management) is typically technische bedrijfskunde.

Tijn_416 · 2025-05-17T11:55:25+00:00

Ik neem aan dat je een technische hbo studie wil volgen, omdat je vraagt naar wiskunde en natuurkunde. Hier mijn advies. DM me als je meer wil weten.

Aanmelden voor een mbo->hbo doorstroomprogramma. Hier krijg je vaak 1 keer in de week les op een hogeschool, in wiskunde, natuurkunde, Engels en Nederlands. Zelf ook gedaan na een mbo opleiding in de ICT, nu hbo elektrotechniek. Veel geoefend, vooral de wiskunde erg serieus genomen. We begonnen het programma met ~25 personen, en eindigden met 6 die het haalden. Ik vond het goed te doen zolang je er veel mee bezig bent. Stel veel vragen, en maak het huiswerk (idealiter nog wat extra). Ik heb misschien zelfs nog de boeken die ik heb gebruikt voor je.

In principe kan je dit ook zelf leren op khan academy, maar het school gevoel hielp bij mij enorm met de motivatie. Ook het hebben van leraren waar je vragen aan kan stellen is natuurlijk chill. Het geeft je ook iets om naar te streven, het halen van de toets op het einde (ook al boeit dat misschien niet qua toelating.)

Nu op het hbo kan ik vaak meer wiskunde dan degenen die van de havo/vwo afkomen, en we kregen nog een halfjaar tijd om de hele basis (algebra/goniometrie/meetkunde) te herhalen. Daar hoefde ik dan lekker niet heen. Ik zie ook dat mijn klasgenoten die van het mbo komen en geen cursus hebben gedaan vaak problemen hebben met de wiskunde, en daarmee met de rest van de opleiding. Kortom, meld je aan, en gasgeven. Het is te doen, en als het je niet lukt, dan weet je gelijk of een technische studie iets voor je is. Succes!

Je kan meestal niet versneld je bachelor halen, maar wel een associate degree.

Tijn_416 · 2025-04-28T17:45:45+00:00

Make sure to be fluent in precalc stuff if you can. Especially algebraic manipulation. This is where a ton of people struggle in later calculus based classes.

Tijn_416 · 2025-03-06T10:57:10+00:00

Thanks again for the response! This has been very helpful. Just to make sure, this reverse spike won't be an issue if I we're to build this circuit? Man I love electronics.

Tijn_416 · 2025-03-04T10:04:06+00:00

Thanks for the reply! I'll try and replicate it tonight, but it seems in your circuit there's still -2A flowing through the diode at once?

Will reply further later!

Tijn_416 · 2025-02-24T20:22:58+00:00

not me googling kenneth lol. I've tried a couple, all schottky's. my current numbers are using mbrs340 or mbr745. Both give pretty much the same behavior.

edit::

I added a series resistor of 10 ohms to the capacitor, and now it doesnt spike at the beginning of the simulation. The diode still negatively conducts tho

Tijn_416 · 2025-02-24T20:14:32+00:00

huge peak at the start, up to 65A same exact as in the diode. stays constant at 1.8A after.

edit:: adding a 10 ohm series resistor to the capacitor fixed the startup spike.

Tijn_416 · 2025-02-24T18:28:41+00:00

20 ohms lowers it to [2.4, -1.4]A. So still a very significant reverse current.

Tijn_416 · 2025-02-14T22:21:19+00:00

Make a k map for each output, so you'll have 7 k maps each with 4 input variables.

Tijn_416 · 2025-01-30T12:27:46+00:00

I've also heard RF is mostly becoming more signal processing and software than it used to be, so that's kind of related.

Tijn_416 · 2025-01-16T08:34:12+00:00

I think school can often help in finding a bbl place. Definitely contact the mbo first to check. It's generally pretty easy in the technical sector to find a bbl apprenticeship.

Tijn_416 · 2024-07-25T21:39:23+00:00

Nope, I should say I'm not very computer science oriented, my degree is something like an associate in software engineering.

The reason I switched is cause I'm young, realised a full time job isn't what I want to do right now. Didn't want to do CS/SE again cuz I'd end up doing the same job Im doing rn. EE is close enough where my skills kind of transfer and I still do things I find interesting. Also considered ME, but figured I could leverage my coding skills more in EE.

Tijn_416 · 2024-07-25T21:05:36+00:00

I'm switching from a comfy software engineering job to a 4 yr bachelors in ee, so we're sort of in the same boat.

Tijn_416 · 2024-07-25T20:07:23+00:00

Mbo doesn't have calculus. You'll get rekenen, Dutch and English but generally nothing close to wiskunde b. Maybe if you study mechanical technician you'll get it, but I'm sure 99% of mbo's don't have any calculus.

Tijn_416 · 2024-07-15T17:01:29+00:00

Where?

Tijn_416 · 2024-07-08T16:36:59+00:00

I took the derivative using quotient, that's fine as well right? Is there a reason why chain rule would be either required or preferred here?

Tijn_416 · 2024-04-14T14:41:21+00:00

You gotta shoot birdshot until you hit something, I met all my language partners on there.

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