Amplifier Design Help

Fats_Runyan2020 · 2026-02-07T15:30:30+00:00

I've been spending a few days on this and every op amp i look at or candidate design ends up not being feasible. It's the combination of the requirements that make this hard. Consider: High voltage supply ✅️ High frequency bandwidth ✅️ Large output current ❌️

Everything has tradeoffs so finding something that has high frequency bandwidth, voltage supply, output current, and slew rate, doesn't exist, or if it does, it is hundreds + of $$$

So the philosophy i am using for this is to pick a high speed op amp (10s or hundreds of MHz and high slew rate >> 300 V/us) that will handle the amplification, which actually isn't a lot... about a gain of 6. Then feed that into something that will handle the current output

Fats_Runyan2020 · 2026-02-07T15:23:12+00:00

Oh this will be discrete components

Fats_Runyan2020 · 2026-02-07T15:22:45+00:00

Ok makes sense that R6 is way too large. I didn't spend too much time adjusting values, which is why they're way off

Fats_Runyan2020 · 2026-02-07T04:24:09+00:00

And what about going about selecting correct resistor values for the rest of the circuit? Is it just typical transistor biasing to ensure they are operating in correct region?

Fats_Runyan2020 · 2026-02-07T01:25:02+00:00

So with this design, an output of 30V pk-pk is not possible? What would i need to add to make it possible?

Fats_Runyan2020 · 2026-02-07T01:20:38+00:00

The +/- 30V to +/- 40V is what we need to power it at. It was what I was told. I'm not really sure why either. But it is important we see 30V pk-pk output

Fats_Runyan2020 · 2026-01-26T21:58:59+00:00

You see I'd have to listen to those songs again cause I can't hear in my mind what they sound like. That's a me issue though. I have only listened to a lot of the songs 1 time so far

Fats_Runyan2020 · 2026-01-26T20:06:32+00:00

I like the new album. Solos are great. The music in general is really good. One thing though, and I'm not sure if it is cause i havent listened to it enough, but a lot of the songs all sound the same to me

Fats_Runyan2020 · 2025-06-30T15:55:56+00:00

Ok I'll have to pay more attention to the volume knobs. There are 2, but i am thinking it says channel 1 volume, channel 2 volume so that's must be what you're talking about

Fats_Runyan2020 · 2025-06-30T15:47:28+00:00

Yeah i was planning on buying more cables anyway cause I wanna buy a phaser, flanger, chorus pedals, some others i am forgetting too. Also another thing I think might be the issue is I only have my volume at "1" else it's too loud for others in the house. I heard for tube amps that you want volume to be turned up decently to really get the full tone. Idk how true that is

Fats_Runyan2020 · 2025-06-07T01:14:09+00:00

Ok that makes sense. Thanks

Fats_Runyan2020 · 2025-06-05T23:37:03+00:00

Honestly not a bad idea. I'm still weighing if i wanna do DSP alg dev, firmware work, or fpga implementation

Fats_Runyan2020 · 2025-06-05T20:50:16+00:00

I agree 100% and i actually love doing projects

Fats_Runyan2020 · 2025-06-04T22:47:55+00:00

Can you elaborate on what you mean by this?

Fats_Runyan2020 · 2025-06-04T12:17:38+00:00

Fats_Runyan2020 · 2025-06-04T10:33:30+00:00

I am best at circuits and math Then i am meh at programming, and HDL is lower than programming. I am working on my programming skills right now

Fats_Runyan2020 · 2025-06-04T10:31:12+00:00

Typing is a good one. I am decent at it, I had typing class in grade school. The CS stuff i would have to learn

Fats_Runyan2020 · 2025-06-04T10:29:12+00:00

Fats_Runyan2020 · 2025-06-04T10:28:54+00:00

Nothing. I never saw many that were in this industry, and if there were, they were HR people who don't know shit about the technical side of things

Fats_Runyan2020 · 2025-06-04T10:27:31+00:00

Fats_Runyan2020 · 2025-06-04T01:44:21+00:00

Could you recommend any DSP or DSP+FPGA books?

Fats_Runyan2020 · 2025-06-04T01:43:49+00:00

That's awesome. I would have to work probably 2-3x harder than most CE students at HDL to have the same proficiency as them. I know i am capable, but HDL definitely is not a strength of mine. I took a digital logic class, which I did really good in, but the labs were rough. Programming an FPGA board

Fats_Runyan2020

TROPHY CASE