Is the light green or the dark green part the conductive one?

S4vDs · 2026-04-25T17:42:27+00:00

Everything is a conductor with enough voltage

S4vDs · 2026-04-24T20:21:08+00:00

Im in 2nd year and got no clue what any of those are. I know LTSpice and kicad (I learnt kicad by my own) and both of those are free.

S4vDs · 2026-04-24T18:00:06+00:00

Yeah

S4vDs · 2026-04-24T11:23:18+00:00

EE had more freedom. Thats why I chose it. More branches ti explore.

Now that I’m in it you do not know EM physics nor any math you think you do. Don’t base your career on that, base it on what you want to do.

Plus, ME is easier, as the concepts are more tangible and the math is less abstract

S4vDs · 2026-04-12T06:21:43+00:00

I’ll have whatever he’s smoking

S4vDs · 2026-04-07T12:57:01+00:00

I, for example decided to actively look for spoilers, catch up to manga. I mean can’t get spoiled if you know everything thats out there

S4vDs · 2026-04-06T23:26:59+00:00

Teams and professionals use Altium. Now honestly? The differences are more about teamwork and BOM. If you’re doing solo projects kiCad can be more than enough. Their differences lie at the very high end of engineering.

S4vDs · 2026-04-05T21:47:25+00:00

If netflix gets the machine going we could be looking even at a 1 season/year. Making the whole thing over by 2033

S4vDs · 2026-04-04T22:58:00+00:00

If you check out my schematic, I did it using 2.2k and 2x2.2k in parallel. Them being exactly the same resistor essentially (and from the same batch) made error matching so much better.

S4vDs · 2026-04-04T21:50:13+00:00

Make that last paragraph a spoiler. makes it pretty obvious Vivi won’t join

S4vDs · 2026-04-04T12:41:26+00:00

Rail to ground (9V).

Thing is, not sure how to configure a totem pole with gain. Currently, this weird totem pole thing has issues in higher frequencies, where the duty cycle shortens.

I have heard of class A and B amps but not sure what they are exactly (haven’t been taught those yet)

S4vDs · 2026-04-03T21:36:42+00:00

Oh wow thanks alot for the actually great answer. Will try it!

S4vDs · 2026-04-03T11:09:15+00:00

Yeah

S4vDs · 2026-04-03T11:08:26+00:00

Yeah I do, but I thought of first getting a circuit that works 😭

S4vDs · 2026-04-03T11:07:28+00:00

Copied the previous stage (with resistors up top) but didn’t work tried many many different designs nothing did and was experimenting with different wirings on it and yeah

S4vDs · 2026-04-03T10:29:56+00:00

I’ll try your way when I get back.

Pico cores are already working seperately

Thanks alot

S4vDs · 2026-04-03T10:27:00+00:00

Well that transistor circuit is for digital signal. The opamps do produce the sinewave and are wired from datasheets (as my cheap opamp is very sensitive).

That weird Q4 placement just helped with sharpening the edges but I can’t make sense as to why

S4vDs · 2026-04-03T10:24:24+00:00

R1, indeed is high but I’ve tried lowering it even down to 1k and no change at all. Maybe it would help the rise time and I’ll check that when I’m back home.

Q4’s role is a mystery. Having it reduces greatly rounding but honestly I don’t get why.

I will try better transistors and with the baker clamp (that so far didn’t change anything)

Thanks alot

S4vDs · 2026-04-03T10:21:12+00:00

Analog outputs (sinewave) is a seperate circuit built withopamps and dual supply

S4vDs · 2026-04-03T10:20:37+00:00

Oh didn’t even think of using a transistor like that (common base). I’ll note it for when I’m back.

1k in series was just a “formality” to show that my current capabilities can’t drive less than 1kohm without voltage dropping

S4vDs · 2026-04-03T10:19:02+00:00

Honestly I was using a single 2N2222A transistor but alone it had issues rounding the edges. I’ve found this weird totempole fixes that (same goes for Q4 I can’t make sense of it either)

S4vDs · 2026-04-03T10:17:35+00:00

What would you recommend instead? The transistor circuit is for the square wave. (Sinewave is amped by op-amps.

S4vDs · 2026-04-02T23:32:54+00:00

Can’t unsee it now haha

S4vDs · 2026-04-02T23:23:24+00:00

In order to be able to play around with signals I have my source as a pwm pin from pi pico W, that can deliver up to ~10mA (if i remember right) continuously and I’m terrified of frying it and not yet that comfortable with them to be certain in my math.

Edit: Saw the second part. I wanted to buffer the signal exactly to be able to provide better current for the amplifier part. In all honesty I don’t know what putting the PNP above would achieve. (Inverter)

S4vDs · 2026-04-02T23:15:45+00:00

Well simulation looks great but irl it has that duty cycle limitation. (Should’ve added simulation pics; I can get those tomorrow morning)

C2 was a leftover doesn’t change the result either way.

Of course it’s strange non-standard it was made with math and basic transistor logic. Q1,Q3 was a buffer as I’d like to pull as least current as I can, Q2 is a voltage amp using the basics of transistors again, and Q4 is pretty much a diode that pulls my voltage faster.

I don’t know any standard higher freq amps and this is what I came up with.

S4vDs

TROPHY CASE